{"id":116411,"date":"2026-10-21T09:41:27","date_gmt":"2026-10-21T01:41:27","guid":{"rendered":"https:\/\/www.wsisp.com\/helps\/116411.html"},"modified":"2026-10-21T09:41:27","modified_gmt":"2026-10-21T01:41:27","slug":"%e3%80%8ajava%e5%b9%b6%e5%8f%91%e7%bc%96%e7%a8%8b%e4%b9%8b%e7%be%8e%e3%80%8b%e7%ac%ac-1-%e7%ab%a0-%e5%b9%b6%e5%8f%91%e7%bc%96%e7%a8%8b%e7%ba%bf%e7%a8%8b%e5%9f%ba%e7%a1%80-%e9%98%85%e8%af%bb%e7%ac%94","status":"publish","type":"post","link":"https:\/\/www.wsisp.com\/helps\/116411.html","title":{"rendered":"\u300aJava\u5e76\u53d1\u7f16\u7a0b\u4e4b\u7f8e\u300b\u7b2c 1 \u7ae0 \u5e76\u53d1\u7f16\u7a0b\u7ebf\u7a0b\u57fa\u7840 \u9605\u8bfb\u7b14\u8bb0 2"},"content":{"rendered":"<h2>\u300aJava\u5e76\u53d1\u7f16\u7a0b\u4e4b\u7f8e\u300b\u7b2c 1 \u7ae0 \u5e76\u53d1\u7f16\u7a0b\u7ebf\u7a0b\u57fa\u7840 \u9605\u8bfb\u7b14\u8bb0 2<\/h2>\n<h2>1.8 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\u5df2\u7ecf\u6301\u6709\u4e86\u8d44\u6e90 1&#xff0c;\u5b83\u540c\u65f6\u8fd8\u60f3\u7533\u8bf7\u8d44\u6e90 2&#xff0c;<br \/>\n\u6240\u4ee5\u7ebf\u7a0b 1 \u548c\u7ebf\u7a0b 2 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{T0, T1, T2, \u2026, Tn} \u4e2d\u7684 T0 \u6b63\u5728\u7b49\u5f85\u4e00\u4e2a T1 \u5360\u7528\u7684\u8d44\u6e90&#xff0c;T1 \u6b63\u5728\u7b49\u5f85 T2 \u5360\u7528\u7684\u8d44\u6e90&#xff0c;\u2026\u2026Tn \u6b63\u5728\u7b49\u5f85\u5df2\u88ab T0 \u5360\u7528\u7684\u8d44\u6e90\u3002<\/li>\n<\/ul>\n<p>\u4e0b\u9762\u901a\u8fc7\u4e00\u4e2a\u4f8b\u5b50\u6765\u8bf4\u660e\u7ebf\u7a0b\u6b7b\u9501\u3002<\/p>\n<p><span class=\"token keyword\">package<\/span> <span class=\"token namespace\">com<span class=\"token punctuation\">.<\/span>yangjunbo<span class=\"token punctuation\">.<\/span>juc<span class=\"token punctuation\">.<\/span>one<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token keyword\">public<\/span> <span class=\"token keyword\">class<\/span> <span class=\"token class-name\">DeadLockTest2<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token comment\">\/\/ \u521b\u5efa\u8d44\u6e90<\/span><br \/>\n    <span class=\"token keyword\">private<\/span> <span class=\"token keyword\">static<\/span> <span class=\"token class-name\">Object<\/span> resourceA <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">Object<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">private<\/span> <span class=\"token keyword\">static<\/span> <span class=\"token class-name\">Object<\/span> resourceB <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">Object<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token keyword\">public<\/span> <span class=\"token keyword\">static<\/span> <span class=\"token keyword\">void<\/span> <span class=\"token function\">main<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">String<\/span><span class=\"token punctuation\">[<\/span><span class=\"token punctuation\">]<\/span> args<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token comment\">\/\/ \u521b\u5efa\u7ebf\u7a0bA<\/span><br \/>\n        <span class=\"token class-name\">Thread<\/span> threadA <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">Thread<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">new<\/span> <span class=\"token class-name\">Runnable<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            <span class=\"token keyword\">public<\/span> <span class=\"token keyword\">void<\/span> <span class=\"token function\">run<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n                <span class=\"token keyword\">synchronized<\/span> <span class=\"token punctuation\">(<\/span>resourceA<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n                    <span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span>out<span class=\"token punctuation\">.<\/span><span class=\"token function\">println<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">Thread<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">currentThread<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">&#043;<\/span> <span class=\"token string\">&#034; get ResourceA&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n                    <span class=\"token keyword\">try<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n                        <span class=\"token class-name\">Thread<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">sleep<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">1000<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n                    <span class=\"token punctuation\">}<\/span> <span class=\"token keyword\">catch<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token class-name\">InterruptedException<\/span> e<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n                        e<span class=\"token punctuation\">.<\/span><span class=\"token function\">printStackTrace<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n                    <span class=\"token punctuation\">}<\/span><br \/>\n                    <span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span>out<span class=\"token punctuation\">.<\/span><span class=\"token function\">println<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">Thread<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">currentThread<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">&#043;<\/span> <span class=\"token string\">&#034;waiting get sourceB&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n                    <span class=\"token keyword\">synchronized<\/span> <span class=\"token punctuation\">(<\/span>resourceB<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n                        <span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span>out<span class=\"token punctuation\">.<\/span><span class=\"token function\">println<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">Thread<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">currentThread<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">&#043;<\/span> <span class=\"token string\">&#034;get esourceB&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n                    <span class=\"token punctuation\">}<\/span><br \/>\n                <span class=\"token punctuation\">}<\/span><br \/>\n            <span class=\"token punctuation\">}<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token comment\">\/\/ \u521b\u5efa\u7ebf\u7a0bB<\/span><br \/>\n        <span class=\"token class-name\">Thread<\/span> threadB <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">Thread<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">new<\/span> <span class=\"token class-name\">Runnable<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            <span class=\"token keyword\">public<\/span> <span class=\"token keyword\">void<\/span> <span class=\"token function\">run<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n                <span class=\"token keyword\">synchronized<\/span> <span class=\"token punctuation\">(<\/span>resourceB<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n                    <span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span>out<span class=\"token punctuation\">.<\/span><span class=\"token function\">println<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">Thread<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">currentThread<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">&#043;<\/span> <span class=\"token string\">&#034; get ResourceB&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n                    <span class=\"token keyword\">try<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n                        <span class=\"token class-name\">Thread<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">sleep<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">1000<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n                    <span class=\"token punctuation\">}<\/span> <span class=\"token keyword\">catch<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token class-name\">InterruptedException<\/span> e<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n                        e<span class=\"token punctuation\">.<\/span><span class=\"token function\">printStackTrace<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n                    <span class=\"token punctuation\">}<\/span><br \/>\n                    <span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span>out<span class=\"token punctuation\">.<\/span><span class=\"token function\">println<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">Thread<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">currentThread<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">&#043;<\/span> <span class=\"token string\">&#034;waiting get esourceA&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n                    <span class=\"token keyword\">synchronized<\/span> <span class=\"token punctuation\">(<\/span>resourceA<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n                        <span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span>out<span class=\"token punctuation\">.<\/span><span class=\"token function\">println<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">Thread<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">currentThread<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">&#043;<\/span> <span class=\"token string\">&#034;get ResourceA&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n                    <span class=\"token punctuation\">}<\/span><br \/>\n                <span class=\"token punctuation\">}<\/span><br \/>\n                <span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token punctuation\">}<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token comment\">\/\/ \u542f\u52a8\u7ebf\u7a0b<\/span><br \/>\n        threadA<span class=\"token punctuation\">.<\/span><span class=\"token function\">start<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        threadB<span class=\"token punctuation\">.<\/span><span class=\"token function\">start<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p>\u8f93\u51fa\u7ed3\u679c\u5982\u4e0b\u3002<br \/>\n<img decoding=\"async\" src=\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2026\/10\/20261021014115-6ad8183b71938.png\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\" \/><br \/>\n\u4e0b\u9762\u5206\u6790\u4ee3\u7801\u548c\u7ed3\u679c&#xff1a;<br \/>\nThread-0 \u662f\u7ebf\u7a0b A, Thread-1 \u662f\u7ebf\u7a0b B&#xff0c;\u4ee3\u7801\u9996\u5148\u521b\u5efa\u4e86\u4e24\u4e2a\u8d44\u6e90&#xff0c;\u5e76\u521b\u5efa\u4e86\u4e24\u4e2a\u7ebf\u7a0b\u3002<br \/>\n\u4ece\u8f93\u51fa\u7ed3\u679c\u53ef\u4ee5\u77e5\u9053&#xff0c;\u7ebf\u7a0b\u8c03\u5ea6\u5668\u5148\u8c03\u5ea6\u4e86\u7ebf\u7a0b A&#xff0c;\u4e5f\u5c31\u662f\u628a CPU \u8d44\u6e90\u5206\u914d\u7ed9\u4e86\u7ebf\u7a0b A&#xff0c;<br \/>\n\u7ebf\u7a0b A \u4f7f\u7528 synchronized(resourceA) \u65b9\u6cd5\u83b7\u53d6\u5230\u4e86 resourceA \u7684\u76d1\u89c6\u5668\u9501&#xff0c;<br \/>\n\u7136\u540e\u8c03\u7528 sleep \u51fd\u6570\u4f11\u7720 1s&#xff0c;\u4f11\u7720 1s \u662f\u4e3a\u4e86\u4fdd\u8bc1\u7ebf\u7a0b A \u5728\u83b7\u53d6 resourceB \u5bf9\u5e94\u7684\u9501\u524d\u8ba9\u7ebf\u7a0b B \u62a2\u5360\u5230 CPU&#xff0c;\u83b7\u53d6\u5230\u8d44\u6e90 resourceB \u4e0a\u7684\u9501\u3002\u7ebf\u7a0b A \u8c03\u7528 sleep \u65b9\u6cd5\u540e\u7ebf\u7a0b B \u4f1a\u6267\u884c synchronized(resourceB) \u65b9\u6cd5&#xff0c;\u8fd9\u4ee3\u8868\u7ebf\u7a0b B \u83b7\u53d6\u5230\u4e86 resourceB \u5bf9\u8c61\u7684\u76d1\u89c6\u5668\u9501\u8d44\u6e90&#xff0c;\u7136\u540e\u8c03\u7528sleep \u51fd\u6570\u4f11\u7720 1s\u3002<br \/>\n\u597d\u4e86&#xff0c;\u5230\u4e86\u8fd9\u91cc\u7ebf\u7a0b A \u83b7\u53d6\u5230\u4e86 resourceA \u8d44\u6e90&#xff0c;\u7ebf\u7a0b B \u83b7\u53d6\u5230\u4e86 resourceB \u8d44\u6e90\u3002<br \/>\n\u7ebf\u7a0b A \u4f11\u7720\u7ed3\u675f\u540e\u4f1a\u4f01\u56fe\u83b7\u53d6 resourceB \u8d44\u6e90&#xff0c;\u800c resourceB \u8d44\u6e90\u88ab\u7ebf\u7a0b B \u6240\u6301\u6709&#xff0c;\u6240\u4ee5\u7ebf\u7a0b A \u4f1a\u88ab\u963b\u585e\u800c\u7b49\u5f85\u3002<br \/>\n\u800c\u540c\u65f6\u7ebf\u7a0b B \u4f11\u7720\u7ed3\u675f\u540e\u4f1a\u4f01\u56fe\u83b7\u53d6 resourceA \u8d44\u6e90&#xff0c;\u800c resourceA \u8d44\u6e90\u5df2\u7ecf\u88ab\u7ebf\u7a0b A \u6301\u6709&#xff0c;<br \/>\n\u6240\u4ee5\u7ebf\u7a0b A \u548c\u7ebf\u7a0b B \u5c31\u9677\u5165\u4e86\u76f8\u4e92\u7b49\u5f85\u7684\u72b6\u6001&#xff0c;\u4e5f\u5c31\u4ea7\u751f\u4e86\u6b7b\u9501\u3002<br \/>\n\u4e0b\u9762\u8c08\u8c08\u672c\u4f8b\u662f\u5982\u4f55\u6ee1\u8db3\u6b7b\u9501\u7684\u56db\u4e2a\u6761\u4ef6\u7684\u3002<\/p>\n<p>\u9996\u5148&#xff0c;resourceA \u548c resourceB \u90fd\u662f\u4e92\u65a5\u8d44\u6e90&#xff0c;<br \/>\n\u5f53\u7ebf\u7a0b A \u8c03\u7528 synchronized(resourceA) \u65b9\u6cd5\u83b7\u53d6\u5230 resourceA \u4e0a\u7684\u76d1\u89c6\u5668\u9501\u5e76\u91ca\u653e\u524d&#xff0c;<br \/>\n\u7ebf\u7a0b B \u518d\u8c03\u7528 synchronized(resourceA) \u65b9\u6cd5\u5c1d\u8bd5\u83b7\u53d6\u8be5\u8d44\u6e90\u4f1a\u88ab\u963b\u585e&#xff0c;<br \/>\n\u53ea\u6709\u7ebf\u7a0b A \u4e3b\u52a8\u91ca\u653e\u8be5\u9501&#xff0c;\u7ebf\u7a0b B \u624d\u80fd\u83b7\u5f97&#xff0c;\u8fd9\u6ee1\u8db3\u4e86\u8d44\u6e90\u4e92\u65a5\u6761\u4ef6\u3002<\/p>\n<p>\u7ebf\u7a0b A \u9996\u5148\u901a\u8fc7 synchronized(resourceA) \u65b9\u6cd5\u83b7\u53d6\u5230 resourceA \u4e0a\u7684\u76d1\u89c6\u5668\u9501\u8d44\u6e90&#xff0c;<br \/>\n\u7136\u540e\u901a\u8fc7 synchronized(resourceB) \u65b9\u6cd5\u7b49\u5f85\u83b7\u53d6 resourceB \u4e0a\u7684\u76d1\u89c6\u5668\u9501\u8d44\u6e90&#xff0c;\u8fd9\u5c31\u6784\u6210\u4e86\u8bf7\u6c42\u5e76\u6301\u6709\u6761\u4ef6\u3002<\/p>\n<p>\u7ebf\u7a0b A \u5728\u83b7\u53d6 resourceA \u4e0a\u7684\u76d1\u89c6\u5668\u9501\u8d44\u6e90\u540e&#xff0c;\u8be5\u8d44\u6e90\u4e0d\u4f1a\u88ab\u7ebf\u7a0b B \u63a0\u593a\u8d70&#xff0c;<br \/>\n\u53ea\u6709\u7ebf\u7a0b A \u81ea\u5df1\u4e3b\u52a8\u91ca\u653e resourceA \u8d44\u6e90\u65f6&#xff0c;\u5b83\u624d\u4f1a\u653e\u5f03\u5bf9\u8be5\u8d44\u6e90\u7684\u6301\u6709\u6743&#xff0c;\u8fd9\u6784\u6210\u4e86\u8d44\u6e90\u7684\u4e0d\u53ef\u5265\u593a\u6761\u4ef6\u3002<\/p>\n<p>\u7ebf\u7a0b A \u6301\u6709 resourceA \u8d44\u6e90\u5e76\u7b49\u5f85\u83b7\u53d6 resourceB \u8d44\u6e90&#xff0c;\u800c\u7ebf\u7a0b B \u6301\u6709 resourceB \u8d44\u6e90\u5e76\u7b49\u5f85 resourceA \u8d44\u6e90&#xff0c;\u8fd9\u6784\u6210\u4e86\u73af\u8def\u7b49\u5f85\u6761\u4ef6\u3002<br \/>\n\u6240\u4ee5\u7ebf\u7a0b A \u548c\u7ebf\u7a0b B \u5c31\u8fdb\u5165\u4e86\u6b7b\u9501\u72b6\u6001\u3002<\/p>\n<h3>1.9.2 \u5982\u4f55\u907f\u514d\u7ebf\u7a0b\u6b7b\u9501<\/h3>\n<p>\u8981\u60f3\u907f\u514d\u6b7b\u9501&#xff0c;\u53ea\u9700\u8981\u7834\u574f\u6389\u81f3\u5c11\u4e00\u4e2a\u6784\u9020\u6b7b\u9501\u7684\u5fc5\u8981\u6761\u4ef6\u5373\u53ef&#xff0c;<br \/>\n\u4f46\u662f\u5b66\u8fc7\u64cd\u4f5c\u7cfb\u7edf\u7684\u8bfb\u8005\u5e94\u8be5\u90fd\u77e5\u9053&#xff0c;\u76ee\u524d\u53ea\u6709\u8bf7\u6c42\u5e76\u6301\u6709\u548c\u73af\u8def\u7b49\u5f85\u6761\u4ef6\u662f\u53ef\u4ee5\u88ab\u7834\u574f\u7684\u3002<\/p>\n<p>\u9020\u6210\u6b7b\u9501\u7684\u539f\u56e0\u5176\u5b9e\u548c\u7533\u8bf7\u8d44\u6e90\u7684\u987a\u5e8f\u6709\u5f88\u5927\u5173\u7cfb&#xff0c;\u4f7f\u7528\u8d44\u6e90\u7533\u8bf7\u7684\u6709\u5e8f\u6027\u539f\u5219\u5c31\u53ef\u4ee5\u907f\u514d\u6b7b\u9501&#xff0c;\u90a3\u4e48\u4ec0\u4e48\u662f\u8d44\u6e90\u7533\u8bf7\u7684\u6709\u5e8f\u6027\u5462&#xff1f;<br \/>\n\u6211\u4eec\u5bf9\u4e0a\u9762\u7ebf\u7a0b B \u7684\u4ee3\u7801\u8fdb\u884c\u5982\u4e0b\u4fee\u6539\u3002\u628a\u7ebf\u7a0b B \u7684 synchronized (resourceA) \u548c synchronized (resourceB) \u6539\u4e3a\u4e0e\u7ebf\u7a0b A \u987a\u5e8f\u4e00\u81f4\u3002<\/p>\n<p>        <span class=\"token comment\">\/\/ \u521b\u5efa\u7ebf\u7a0bB<\/span><br \/>\n        <span class=\"token class-name\">Thread<\/span> threadB <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">Thread<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">new<\/span> <span class=\"token class-name\">Runnable<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            <span class=\"token keyword\">public<\/span> <span class=\"token keyword\">void<\/span> <span class=\"token function\">run<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n                <span class=\"token keyword\">synchronized<\/span> <span class=\"token punctuation\">(<\/span>resourceA<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n                    <span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span>out<span class=\"token punctuation\">.<\/span><span class=\"token function\">println<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">Thread<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">currentThread<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">&#043;<\/span> <span class=\"token string\">&#034; get ResourceB&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n                    <span class=\"token keyword\">try<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n                        <span class=\"token class-name\">Thread<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">sleep<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">1000<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n                    <span class=\"token punctuation\">}<\/span> <span class=\"token keyword\">catch<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token class-name\">InterruptedException<\/span> e<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n                        e<span class=\"token punctuation\">.<\/span><span class=\"token function\">printStackTrace<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n                    <span class=\"token punctuation\">}<\/span><br \/>\n                    <span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span>out<span class=\"token punctuation\">.<\/span><span class=\"token function\">println<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">Thread<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">currentThread<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">&#043;<\/span> <span class=\"token string\">&#034;waiting get ResourceA&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n                    <span class=\"token keyword\">synchronized<\/span> <span class=\"token punctuation\">(<\/span>resourceB<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n                        <span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span>out<span class=\"token punctuation\">.<\/span><span class=\"token function\">println<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">Thread<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">currentThread<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">&#043;<\/span> <span class=\"token string\">&#034;get ResourceA&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n                    <span class=\"token punctuation\">}<\/span><br \/>\n                <span class=\"token punctuation\">}<\/span><br \/>\n                <span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token punctuation\">}<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>\u8f93\u51fa\u7ed3\u679c\u5982\u4e0b\u3002<br \/>\n<img decoding=\"async\" src=\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2026\/10\/20261021014116-6ad8183c15d51.png\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\" \/><br \/>\n\u5982\u4e0a\u4ee3\u7801\u8ba9\u5728\u7ebf\u7a0b B \u4e2d\u83b7\u53d6\u8d44\u6e90\u7684\u987a\u5e8f\u548c\u5728\u7ebf\u7a0b A \u4e2d\u83b7\u53d6\u8d44\u6e90\u7684\u987a\u5e8f\u4fdd\u6301\u4e00\u81f4&#xff0c;\u5176\u5b9e\u8d44\u6e90\u5206\u914d\u6709\u5e8f\u6027\u5c31\u662f\u6307&#xff0c;\u5047\u5982\u7ebf\u7a0b A \u548c\u7ebf\u7a0b B \u90fd\u9700\u8981\u8d44\u6e901,2,3, \u2026, n \u65f6&#xff0c;\u5bf9\u8d44\u6e90\u8fdb\u884c\u6392\u5e8f&#xff0c;\u7ebf\u7a0b A \u548c\u7ebf\u7a0b B \u53ea\u6709\u5728\u83b7\u53d6\u4e86\u8d44\u6e90 n-1 \u65f6\u624d\u80fd\u53bb\u83b7\u53d6\u8d44\u6e90 n\u3002<\/p>\n<p>\u6211\u4eec\u53ef\u4ee5\u7b80\u5355\u5206\u6790\u4e00\u4e0b\u4e3a\u4f55\u8d44\u6e90\u7684\u6709\u5e8f\u5206\u914d\u4f1a\u907f\u514d\u6b7b\u9501&#xff0c;\u6bd4\u5982\u4e0a\u9762\u7684\u4ee3\u7801&#xff0c;<br \/>\n\u5047\u5982\u7ebf\u7a0b A \u548c\u7ebf\u7a0b B \u540c\u65f6\u6267\u884c\u5230\u4e86 synchronized(resourceA)\u200b&#xff0c;\u53ea\u6709\u4e00\u4e2a\u7ebf\u7a0b\u53ef\u4ee5\u83b7\u53d6\u5230 resourceA \u4e0a\u7684\u76d1\u89c6\u5668\u9501&#xff0c;<br \/>\n\u5047\u5982\u7ebf\u7a0b A \u83b7\u53d6\u5230\u4e86&#xff0c;\u90a3\u4e48\u7ebf\u7a0b B \u5c31\u4f1a\u88ab\u963b\u585e\u800c\u4e0d\u4f1a\u518d\u53bb\u83b7\u53d6\u8d44\u6e90 B&#xff0c;<br \/>\n\u7ebf\u7a0b A \u83b7\u53d6\u5230 resourceA \u7684\u76d1\u89c6\u5668\u9501\u540e\u4f1a\u53bb\u7533\u8bf7 resourceB \u7684\u76d1\u89c6\u5668\u9501\u8d44\u6e90&#xff0c;\u8fd9\u65f6\u5019\u7ebf\u7a0b A \u662f\u53ef\u4ee5\u83b7\u53d6\u5230\u7684&#xff0c;<br \/>\n\u7ebf\u7a0b A \u83b7\u53d6\u5230 resourceB \u8d44\u6e90\u5e76\u4f7f\u7528\u540e\u4f1a\u653e\u5f03\u5bf9\u8d44\u6e90 resourceB \u7684\u6301\u6709&#xff0c;\u7136\u540e\u518d\u91ca\u653e\u5bf9 resourceA \u7684\u6301\u6709&#xff0c;<br \/>\n\u91ca\u653e resourceA \u540e\u7ebf\u7a0b B \u624d\u4f1a\u88ab\u4ece\u963b\u585e\u72b6\u6001\u53d8\u4e3a\u6fc0\u6d3b\u72b6\u6001\u3002<br \/>\n\u6240\u4ee5\u8d44\u6e90\u7684\u6709\u5e8f\u6027\u7834\u574f\u4e86\u8d44\u6e90\u7684\u8bf7\u6c42\u5e76\u6301\u6709\u6761\u4ef6\u548c\u73af\u8def\u7b49\u5f85\u6761\u4ef6&#xff0c;\u56e0\u6b64\u907f\u514d\u4e86\u6b7b\u9501\u3002<\/p>\n<h2>1.10 \u5b88\u62a4\u7ebf\u7a0b\u4e0e\u7528\u6237\u7ebf\u7a0b<\/h2>\n<p>Java \u4e2d\u7684\u7ebf\u7a0b\u5206\u4e3a\u4e24\u7c7b&#xff0c;\u5206\u522b\u4e3a daemon \u7ebf\u7a0b&#xff08;\u5b88\u62a4\u7ebf\u7a0b&#xff09;\u548c user \u7ebf\u7a0b&#xff08;\u7528\u6237\u7ebf\u7a0b&#xff09;\u200b\u3002<br \/>\n\u5728 JVM \u542f\u52a8\u65f6\u4f1a\u8c03\u7528 main \u51fd\u6570&#xff0c;main \u51fd\u6570\u6240\u5728\u7684\u7ebf\u7a0b\u5c31\u662f\u4e00\u4e2a\u7528\u6237\u7ebf\u7a0b&#xff0c;<br \/>\n\u5176\u5b9e\u5728 JVM \u5185\u90e8\u540c\u65f6\u8fd8\u542f\u52a8\u4e86\u597d\u591a\u5b88\u62a4\u7ebf\u7a0b&#xff0c;\u6bd4\u5982\u5783\u573e\u56de\u6536\u7ebf\u7a0b\u3002<br \/>\n\u90a3\u4e48\u5b88\u62a4\u7ebf\u7a0b\u548c\u7528\u6237\u7ebf\u7a0b\u6709\u4ec0\u4e48\u533a\u522b\u5462&#xff1f;<br \/>\n\u533a\u522b\u4e4b\u4e00\u662f\u5f53\u6700\u540e\u4e00\u4e2a\u975e\u5b88\u62a4\u7ebf\u7a0b\u7ed3\u675f\u65f6&#xff0c;JVM \u4f1a\u6b63\u5e38\u9000\u51fa&#xff0c;\u800c\u4e0d\u7ba1\u5f53\u524d\u662f\u5426\u6709\u5b88\u62a4\u7ebf\u7a0b&#xff0c;<br \/>\n\u4e5f\u5c31\u662f\u8bf4\u5b88\u62a4\u7ebf\u7a0b\u662f\u5426\u7ed3\u675f\u5e76\u4e0d\u5f71\u54cd JVM \u7684\u9000\u51fa\u3002<br \/>\n\u8a00\u5916\u4e4b\u610f&#xff0c;\u53ea\u8981\u6709\u4e00\u4e2a\u7528\u6237\u7ebf\u7a0b\u8fd8\u6ca1\u7ed3\u675f&#xff0c;\u6b63\u5e38\u60c5\u51b5\u4e0b JVM \u5c31\u4e0d\u4f1a\u9000\u51fa\u3002<\/p>\n<p>\u90a3\u4e48\u5728 Java \u4e2d\u5982\u4f55\u521b\u5efa\u4e00\u4e2a\u5b88\u62a4\u7ebf\u7a0b&#xff1f;\u4ee3\u7801\u5982\u4e0b\u3002<\/p>\n<p><span class=\"token keyword\">public<\/span> <span class=\"token keyword\">static<\/span> <span class=\"token keyword\">void<\/span> <span class=\"token function\">main<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">String<\/span><span class=\"token punctuation\">[<\/span><span class=\"token punctuation\">]<\/span> args<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token class-name\">Thread<\/span> daemonThread <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">Thread<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">new<\/span>  <span class=\"token class-name\">Runnable<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            <span class=\"token keyword\">public<\/span> <span class=\"token keyword\">void<\/span> <span class=\"token function\">run<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            <span class=\"token punctuation\">}<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token comment\">\/\/\u8bbe\u7f6e\u4e3a\u5b88\u62a4\u7ebf\u7a0b<\/span><br \/>\n        daemonThread<span class=\"token punctuation\">.<\/span><span class=\"token function\">setDaemon<\/span><span class=\"token punctuation\">(<\/span><span class=\"token boolean\">true<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        daemonThread<span class=\"token punctuation\">.<\/span><span class=\"token function\">start<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p>\u53ea\u9700\u8981\u8bbe\u7f6e\u7ebf\u7a0b\u7684 daemon \u53c2\u6570\u4e3a true \u5373\u53ef\u3002<\/p>\n<p>\u4e0b\u9762\u901a\u8fc7\u4f8b\u5b50\u6765\u7406\u89e3\u7528\u6237\u7ebf\u7a0b\u4e0e\u5b88\u62a4\u7ebf\u7a0b\u7684\u533a\u522b\u3002\u9996\u5148\u770b\u4e0b\u9762\u7684\u4ee3\u7801\u3002<\/p>\n<p><span class=\"token keyword\">package<\/span> <span class=\"token namespace\">com<span class=\"token punctuation\">.<\/span>yangjunbo<span class=\"token punctuation\">.<\/span>juc<span class=\"token punctuation\">.<\/span>one<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token keyword\">public<\/span> <span class=\"token keyword\">class<\/span> <span class=\"token class-name\">ThreadTest12<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">public<\/span> <span class=\"token keyword\">static<\/span> <span class=\"token keyword\">void<\/span> <span class=\"token function\">main<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">String<\/span><span class=\"token punctuation\">[<\/span><span class=\"token punctuation\">]<\/span> args<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token class-name\">Thread<\/span> thread <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">Thread<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">new<\/span> <span class=\"token class-name\">Runnable<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            <span class=\"token keyword\">public<\/span> <span class=\"token keyword\">void<\/span> <span class=\"token function\">run<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n                <span class=\"token keyword\">for<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">;<\/span><span class=\"token punctuation\">;<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n                <span class=\"token punctuation\">}<\/span><br \/>\n            <span class=\"token punctuation\">}<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token comment\">\/\/ \u542f\u52a8\u5b50\u7ebf\u7a0b<\/span><br \/>\n        thread<span class=\"token punctuation\">.<\/span><span class=\"token function\">start<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span>out<span class=\"token punctuation\">.<\/span><span class=\"token function\">print<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;main thread is over&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p>\u8f93\u51fa\u7ed3\u679c\u5982\u4e0b\u3002<br \/>\n<img decoding=\"async\" src=\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2026\/10\/20261021014116-6ad8183cb0b47.png\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\" \/><br \/>\n\u5982\u4e0a\u4ee3\u7801\u5728 main \u7ebf\u7a0b\u4e2d\u521b\u5efa\u4e86\u4e00\u4e2a thread \u7ebf\u7a0b&#xff0c;\u5728 thread \u7ebf\u7a0b\u91cc\u9762\u662f\u4e00\u4e2a\u65e0\u9650\u5faa\u73af\u3002<br \/>\n\u4ece\u8fd0\u884c\u4ee3\u7801\u7684\u7ed3\u679c\u770b&#xff0c;main \u7ebf\u7a0b\u5df2\u7ecf\u8fd0\u884c\u7ed3\u675f\u4e86&#xff0c;\u90a3\u4e48 JVM \u8fdb\u7a0b\u5df2\u7ecf\u9000\u51fa\u4e86\u5417&#xff1f;<br \/>\n\u5728 IDE \u7684\u8f93\u51fa\u7ed3\u679c\u53f3\u4e0a\u4fa7\u7684\u7ea2\u8272\u65b9\u5757\u8bf4\u660e&#xff0c;JVM \u8fdb\u7a0b\u5e76\u6ca1\u6709\u9000\u51fa\u3002<br \/>\n<img decoding=\"async\" src=\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2026\/10\/20261021014117-6ad8183d55cac.png\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\" \/><br \/>\n\u53e6\u5916&#xff0c;\u6267\u884c jps \u4f1a\u8f93\u51fa\u5982\u4e0b\u7ed3\u679c\u3002<br \/>\n<img decoding=\"async\" src=\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2026\/10\/20261021014117-6ad8183dee843.png\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\" \/><br \/>\n\u8fd9\u4e2a\u7ed3\u679c\u8bf4\u660e\u4e86\u5f53\u7236\u7ebf\u7a0b\u7ed3\u675f\u540e&#xff0c;\u5b50\u7ebf\u7a0b\u8fd8\u662f\u53ef\u4ee5\u7ee7\u7eed\u5b58\u5728\u7684&#xff0c;\u4e5f\u5c31\u662f\u5b50\u7ebf\u7a0b\u7684\u751f\u547d\u5468\u671f\u5e76\u4e0d\u53d7\u7236\u7ebf\u7a0b\u7684\u5f71\u54cd\u3002<br \/>\n\u8fd9\u4e5f\u8bf4\u660e\u4e86\u5728\u7528\u6237\u7ebf\u7a0b\u8fd8\u5b58\u5728\u7684\u60c5\u51b5\u4e0b JVM \u8fdb\u7a0b\u5e76\u4e0d\u4f1a\u7ec8\u6b62\u3002<br \/>\n\u90a3\u4e48\u6211\u4eec\u628a\u4e0a\u9762\u7684 thread \u7ebf\u7a0b\u8bbe\u7f6e\u4e3a\u5b88\u62a4\u7ebf\u7a0b\u540e&#xff0c;\u518d\u6765\u8fd0\u884c\u770b\u770b\u4f1a\u6709\u4ec0\u4e48\u7ed3\u679c&#xff1a;<\/p>\n<p>        <span class=\"token comment\">\/\/\u8bbe\u7f6e\u4e3a\u5b88\u62a4\u7ebf\u7a0b<\/span><br \/>\n        thread<span class=\"token punctuation\">.<\/span><span class=\"token function\">setDaemon<\/span><span class=\"token punctuation\">(<\/span><span class=\"token boolean\">true<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token comment\">\/\/\u542f\u52a8\u5b50\u7ebf\u7a0b<\/span><br \/>\n        thread<span class=\"token punctuation\">.<\/span><span class=\"token function\">start<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>\u8f93\u51fa\u7ed3\u679c\u5982\u4e0b\u3002<br \/>\n<img decoding=\"async\" src=\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2026\/10\/20261021014118-6ad8183e8e893.png\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\" \/><br \/>\n\u5728\u542f\u52a8\u7ebf\u7a0b\u524d\u5c06\u7ebf\u7a0b\u8bbe\u7f6e\u4e3a\u5b88\u62a4\u7ebf\u7a0b&#xff0c;\u6267\u884c\u540e\u7684\u8f93\u51fa\u7ed3\u679c\u663e\u793a&#xff0c;JVM \u8fdb\u7a0b\u5df2\u7ecf\u7ec8\u6b62\u4e86&#xff0c;<br \/>\n\u6267\u884c jps \u4e5f\u770b\u4e0d\u5230 JVM \u8fdb\u7a0b\u4e86\u3002<br \/>\n<img decoding=\"async\" src=\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2026\/10\/20261021014119-6ad8183f2fcd0.png\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\" \/><br \/>\n\u5728\u8fd9\u4e2a\u4f8b\u5b50\u4e2d&#xff0c;main \u51fd\u6570\u662f\u552f\u4e00\u7684\u7528\u6237\u7ebf\u7a0b&#xff0c;thread \u7ebf\u7a0b\u662f\u5b88\u62a4\u7ebf\u7a0b&#xff0c;<br \/>\n\u5f53 main \u7ebf\u7a0b\u8fd0\u884c\u7ed3\u675f\u540e&#xff0c;JVM \u53d1\u73b0\u5f53\u524d\u5df2\u7ecf\u6ca1\u6709\u7528\u6237\u7ebf\u7a0b\u4e86&#xff0c;\u5c31\u4f1a\u7ec8\u6b62 JVM \u8fdb\u7a0b\u3002<br \/>\n\u7531\u4e8e\u8fd9\u91cc\u7684\u5b88\u62a4\u7ebf\u7a0b\u6267\u884c\u7684\u4efb\u52a1\u662f\u4e00\u4e2a\u6b7b\u5faa\u73af&#xff0c;\u8fd9\u4e5f\u8bf4\u660e\u4e86\u5982\u679c\u5f53\u524d\u8fdb\u7a0b\u4e2d\u4e0d\u5b58\u5728\u7528\u6237\u7ebf\u7a0b&#xff0c;\u4f46\u662f\u8fd8\u5b58\u5728\u6b63\u5728\u6267\u884c\u4efb\u52a1\u7684\u5b88\u62a4\u7ebf\u7a0b&#xff0c;<br \/>\n\u5219 JVM \u4e0d\u7b49\u5b88\u62a4\u7ebf\u7a0b\u8fd0\u884c\u5b8c\u6bd5\u5c31\u4f1a\u7ed3\u675f JVM \u8fdb\u7a0b\u3002<\/p>\n<p>main \u7ebf\u7a0b\u8fd0\u884c\u7ed3\u675f\u540e&#xff0c;JVM \u4f1a\u81ea\u52a8\u542f\u52a8\u4e00\u4e2a\u53eb\u4f5c DestroyJavaVM \u7684\u7ebf\u7a0b&#xff0c;\u8be5\u7ebf\u7a0b\u4f1a\u7b49\u5f85\u6240\u6709\u7528\u6237\u7ebf\u7a0b\u7ed3\u675f\u540e\u7ec8\u6b62 JVM \u8fdb\u7a0b\u3002<br \/>\n\u4e0b\u9762\u901a\u8fc7\u7b80\u5355\u7684 JVM \u4ee3\u7801\u6765\u8bc1\u660e\u8fd9\u4e2a\u7ed3\u8bba\u3002<\/p>\n<p>\u7ffb\u770b JVM \u7684\u4ee3\u7801&#xff0c;\u80fd\u591f\u53d1\u73b0&#xff0c;\u6700\u7ec8\u4f1a\u8c03\u7528\u5230 JavaMain \u8fd9\u4e2a C \u51fd\u6570\u3002<\/p>\n<p><span class=\"token keyword\">int<\/span> JNICALL<br \/>\n<span class=\"token function\">JavaMain<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">void<\/span> &#xff0a; _args<span class=\"token punctuation\">)<\/span><br \/>\n<span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token punctuation\">.<\/span><span class=\"token punctuation\">.<\/span><span class=\"token punctuation\">.<\/span><br \/>\n    <span class=\"token comment\">\/\/\u6267\u884cJava\u4e2d\u7684main\u51fd\u6570<\/span><br \/>\n    <span class=\"token punctuation\">(<\/span>&#xff0a;env<span class=\"token punctuation\">)<\/span><span class=\"token operator\">-&gt;<\/span><span class=\"token function\">CallStaticVoidMethod<\/span><span class=\"token punctuation\">(<\/span>env<span class=\"token punctuation\">,<\/span> mainClass<span class=\"token punctuation\">,<\/span> mainID<span class=\"token punctuation\">,<\/span> mainArgs<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token comment\">\/\/main\u51fd\u6570\u8fd4\u56de\u503c<\/span><br \/>\n    ret <span class=\"token operator\">&#061;<\/span> <span class=\"token punctuation\">(<\/span>&#xff0a;env<span class=\"token punctuation\">)<\/span><span class=\"token operator\">-&gt;<\/span><span class=\"token function\">ExceptionOccurred<\/span><span class=\"token punctuation\">(<\/span>env<span class=\"token punctuation\">)<\/span> <span class=\"token operator\">&#061;&#061;<\/span> <span class=\"token constant\">NULL<\/span> <span class=\"token operator\">?<\/span> <span class=\"token number\">0<\/span> <span class=\"token operator\">:<\/span> <span class=\"token number\">1<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token comment\">\/\/\u7b49\u5f85\u6240\u6709\u975e\u5b88\u62a4\u7ebf\u7a0b\u7ed3\u675f&#xff0c;\u7136\u540e\u9500\u6bc1JVM\u8fdb\u7a0b<\/span><br \/>\n    <span class=\"token function\">LEAVE<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p>LEAVE \u662f C \u8bed\u8a00\u91cc\u9762\u7684\u4e00\u4e2a\u5b8f\u5b9a\u4e49&#xff0c;\u5177\u4f53\u5b9a\u4e49\u5982\u4e0b\u3002<\/p>\n<p><span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">define<\/span> <span class=\"token macro-name function\">LEAVE<\/span><span class=\"token expression\"><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <\/span><span class=\"token punctuation\">\\\\<\/span><br \/>\n    <span class=\"token expression\"><span class=\"token keyword\">do<\/span> <span class=\"token punctuation\">{<\/span> <\/span><span class=\"token punctuation\">\\\\<\/span><br \/>\n        <span class=\"token expression\"><span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">(<\/span>&#xff0a;vm<span class=\"token punctuation\">)<\/span><span class=\"token operator\">-&gt;<\/span><span class=\"token function\">DetachCurrentThread<\/span><span class=\"token punctuation\">(<\/span>vm<span class=\"token punctuation\">)<\/span> <span class=\"token operator\">!<\/span> <span class=\"token operator\">&#061;<\/span> JNI_OK<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span> <\/span><span class=\"token punctuation\">\\\\<\/span><br \/>\n            <span class=\"token expression\"><span class=\"token function\">JLI_ReportErrorMessage<\/span><span class=\"token punctuation\">(<\/span>JVM_ERROR2<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span> <\/span><span class=\"token punctuation\">\\\\<\/span><br \/>\n            <span class=\"token expression\">ret <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">1<\/span><span class=\"token punctuation\">;<\/span> <\/span><span class=\"token punctuation\">\\\\<\/span><br \/>\n        <span class=\"token expression\"><span class=\"token punctuation\">}<\/span> <\/span><span class=\"token punctuation\">\\\\<\/span><br \/>\n        <span class=\"token expression\"><span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>JNI_TRUE<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span> <\/span><span class=\"token punctuation\">\\\\<\/span><br \/>\n            <span class=\"token expression\"><span class=\"token punctuation\">(<\/span>&#xff0a;vm<span class=\"token punctuation\">)<\/span><span class=\"token operator\">-&gt;<\/span><span class=\"token function\">DestroyJavaVM<\/span><span class=\"token punctuation\">(<\/span>vm<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span> <\/span><span class=\"token punctuation\">\\\\<\/span><br \/>\n            <span class=\"token expression\"><span class=\"token keyword\">return<\/span> ret<span class=\"token punctuation\">;<\/span> <\/span><span class=\"token punctuation\">\\\\<\/span><br \/>\n        <span class=\"token expression\"><span class=\"token punctuation\">}<\/span> <\/span><span class=\"token punctuation\">\\\\<\/span><br \/>\n    <span class=\"token expression\"><span class=\"token punctuation\">}<\/span> <span class=\"token keyword\">while<\/span> <span class=\"token punctuation\">(<\/span>JNI_FALSE<span class=\"token punctuation\">)<\/span><\/span><\/span><\/p>\n<p>\u8be5\u5b8f\u7684\u4f5c\u7528\u662f\u521b\u5efa\u4e00\u4e2a\u540d\u4e3a DestroyJavaVM \u7684\u7ebf\u7a0b&#xff0c;\u6765\u7b49\u5f85\u6240\u6709\u7528\u6237\u7ebf\u7a0b\u7ed3\u675f\u3002<\/p>\n<p>\u5728 Tomcat \u7684 NIO \u5b9e\u73b0 NioEndpoint \u4e2d\u4f1a\u5f00\u542f\u4e00\u7ec4\u63a5\u53d7\u7ebf\u7a0b\u6765\u63a5\u53d7\u7528\u6237\u7684\u8fde\u63a5\u8bf7\u6c42&#xff0c;\u4ee5\u53ca\u4e00\u7ec4\u5904\u7406\u7ebf\u7a0b\u8d1f\u8d23\u5177\u4f53\u5904\u7406\u7528\u6237\u8bf7\u6c42&#xff0c;<br \/>\n\u90a3\u4e48\u8fd9\u4e9b\u7ebf\u7a0b\u662f\u7528\u6237\u7ebf\u7a0b\u8fd8\u662f\u5b88\u62a4\u7ebf\u7a0b\u5462&#xff1f;\u4e0b\u9762\u6211\u4eec\u770b\u4e00\u4e0b NioEndpoint \u7684 startInternal \u65b9\u6cd5\u3002<\/p>\n<p><span class=\"token keyword\">public<\/span> <span class=\"token keyword\">void<\/span> <span class=\"token function\">startInternal<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token keyword\">throws<\/span> <span class=\"token class-name\">Exception<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n      <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token operator\">!<\/span> running<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            running <span class=\"token operator\">&#061;<\/span> <span class=\"token boolean\">true<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            paused <span class=\"token operator\">&#061;<\/span> <span class=\"token boolean\">false<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token punctuation\">.<\/span><span class=\"token punctuation\">.<\/span><span class=\"token punctuation\">.<\/span><br \/>\n            <span class=\"token comment\">\/\/\u521b\u5efa\u5904\u7406\u7ebf\u7a0b<\/span><br \/>\n            pollers <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">Poller<\/span><span class=\"token punctuation\">[<\/span><span class=\"token function\">getPollerThreadCount<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token keyword\">for<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token keyword\">int<\/span> i<span class=\"token operator\">&#061;<\/span><span class=\"token number\">0<\/span><span class=\"token punctuation\">;<\/span> i<span class=\"token operator\">&lt;<\/span>pollers<span class=\"token punctuation\">.<\/span>length<span class=\"token punctuation\">;<\/span> i<span class=\"token operator\">&#043;&#043;<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n                pollers<span class=\"token punctuation\">[<\/span>i<span class=\"token punctuation\">]<\/span> <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">Poller<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n                <span class=\"token class-name\">Thread<\/span> pollerThread <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">Thread<\/span><span class=\"token punctuation\">(<\/span>pollers<span class=\"token punctuation\">[<\/span>i<span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token function\">getName<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">&#043;<\/span><br \/>\n                <span class=\"token string\">&#034;-ClientPoller-&#034;<\/span><span class=\"token operator\">&#043;<\/span>i<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n                pollerThread<span class=\"token punctuation\">.<\/span><span class=\"token function\">setPriority<\/span><span class=\"token punctuation\">(<\/span>threadPriority<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n                pollerThread<span class=\"token punctuation\">.<\/span><span class=\"token function\">setDaemon<\/span><span class=\"token punctuation\">(<\/span><span class=\"token boolean\">true<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token comment\">\/\/\u58f0\u660e\u4e3a\u5b88\u62a4\u7ebf\u7a0b<\/span><br \/>\n                pollerThread<span class=\"token punctuation\">.<\/span><span class=\"token function\">start<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token punctuation\">}<\/span><br \/>\n            <span class=\"token comment\">\/\/\u542f\u52a8\u63a5\u53d7\u7ebf\u7a0b<\/span><br \/>\n            <span class=\"token function\">startAcceptorThreads<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><br \/>\n    <span class=\"token keyword\">protected<\/span> <span class=\"token keyword\">final<\/span> <span class=\"token keyword\">void<\/span> <span class=\"token function\">startAcceptorThreads<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token keyword\">int<\/span> count <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">getAcceptorThreadCount<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        acceptors <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">Acceptor<\/span><span class=\"token punctuation\">[<\/span>count<span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">for<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token keyword\">int<\/span> i <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">;<\/span> i <span class=\"token operator\">&lt;<\/span> count<span class=\"token punctuation\">;<\/span> i<span class=\"token operator\">&#043;&#043;<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            acceptors<span class=\"token punctuation\">[<\/span>i<span class=\"token punctuation\">]<\/span> <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">createAcceptor<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token class-name\">String<\/span> threadName <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">getName<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">&#043;<\/span> <span class=\"token string\">&#034;-Acceptor-&#034;<\/span> <span class=\"token operator\">&#043;<\/span> i<span class=\"token punctuation\">;<\/span><br \/>\n            acceptors<span class=\"token punctuation\">[<\/span>i<span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">setThreadName<\/span><span class=\"token punctuation\">(<\/span>threadName<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token class-name\">Thread<\/span> t <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">Thread<\/span><span class=\"token punctuation\">(<\/span>acceptors<span class=\"token punctuation\">[<\/span>i<span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">,<\/span> threadName<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            t<span class=\"token punctuation\">.<\/span><span class=\"token function\">setPriority<\/span><span class=\"token punctuation\">(<\/span><span class=\"token function\">getAcceptorThreadPriority<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            t<span class=\"token punctuation\">.<\/span><span class=\"token function\">setDaemon<\/span><span class=\"token punctuation\">(<\/span><span class=\"token function\">getDaemon<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token comment\">\/\/\u8bbe\u7f6e\u662f\u5426\u4e3a\u5b88\u62a4\u7ebf\u7a0b&#xff0c;\u9ed8\u8ba4\u4e3a\u5b88\u62a4\u7ebf\u7a0b<\/span><br \/>\n            t<span class=\"token punctuation\">.<\/span><span class=\"token function\">start<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n    <span class=\"token keyword\">private<\/span> <span class=\"token keyword\">boolean<\/span> daemon <span class=\"token operator\">&#061;<\/span> <span class=\"token boolean\">true<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">public<\/span> <span class=\"token keyword\">void<\/span> <span class=\"token function\">setDaemon<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">boolean<\/span> b<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span> daemon <span class=\"token operator\">&#061;<\/span> b<span class=\"token punctuation\">;<\/span> <span class=\"token punctuation\">}<\/span><br \/>\n    <span class=\"token keyword\">public<\/span> <span class=\"token keyword\">boolean<\/span> <span class=\"token function\">getDaemon<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span> <span class=\"token keyword\">return<\/span> daemon<span class=\"token punctuation\">;<\/span> <span class=\"token punctuation\">}<\/span><\/p>\n<p>\u5728\u5982\u4e0a\u4ee3\u7801\u4e2d&#xff0c;\u5728\u9ed8\u8ba4\u60c5\u51b5\u4e0b&#xff0c;\u63a5\u53d7\u7ebf\u7a0b\u548c\u5904\u7406\u7ebf\u7a0b\u90fd\u662f\u5b88\u62a4\u7ebf\u7a0b&#xff0c;\u8fd9\u610f\u5473\u7740\u5f53 tomcat \u6536\u5230 shutdown \u547d\u4ee4\u540e\u5e76\u4e14\u6ca1\u6709\u5176\u4ed6\u7528\u6237\u7ebf\u7a0b\u5b58\u5728\u7684\u60c5\u51b5\u4e0b tomcat \u8fdb\u7a0b\u4f1a\u9a6c\u4e0a\u6d88\u4ea1&#xff0c;\u800c\u4e0d\u4f1a\u7b49\u5f85\u5904\u7406\u7ebf\u7a0b\u5904\u7406\u5b8c\u5f53\u524d\u7684\u8bf7\u6c42\u3002<\/p>\n<p>\u603b\u7ed3&#xff1a;\u5982\u679c\u4f60\u5e0c\u671b\u5728\u4e3b\u7ebf\u7a0b\u7ed3\u675f\u540e JVM \u8fdb\u7a0b\u9a6c\u4e0a\u7ed3\u675f&#xff0c;\u90a3\u4e48\u5728\u521b\u5efa\u7ebf\u7a0b\u65f6\u53ef\u4ee5\u5c06\u5176\u8bbe\u7f6e\u4e3a\u5b88\u62a4\u7ebf\u7a0b&#xff0c;<br \/>\n\u5982\u679c\u4f60\u5e0c\u671b\u5728\u4e3b\u7ebf\u7a0b\u7ed3\u675f\u540e\u5b50\u7ebf\u7a0b\u7ee7\u7eed\u5de5\u4f5c&#xff0c;\u7b49\u5b50\u7ebf\u7a0b\u7ed3\u675f\u540e\u518d\u8ba9 JVM \u8fdb\u7a0b\u7ed3\u675f&#xff0c;\u90a3\u4e48\u5c31\u5c06\u5b50\u7ebf\u7a0b\u8bbe\u7f6e\u4e3a\u7528\u6237\u7ebf\u7a0b\u3002<\/p>\n<h2>1.11 ThreadLocal<\/h2>\n<p>\u591a\u7ebf\u7a0b\u8bbf\u95ee\u540c\u4e00\u4e2a\u5171\u4eab\u53d8\u91cf\u65f6\u7279\u522b\u5bb9\u6613\u51fa\u73b0\u5e76\u53d1\u95ee\u9898&#xff0c;\u7279\u522b\u662f\u5728\u591a\u4e2a\u7ebf\u7a0b\u9700\u8981\u5bf9\u4e00\u4e2a\u5171\u4eab\u53d8\u91cf\u8fdb\u884c\u5199\u5165\u65f6\u3002<br \/>\n\u4e3a\u4e86\u4fdd\u8bc1\u7ebf\u7a0b\u5b89\u5168&#xff0c;\u4e00\u822c\u4f7f\u7528\u8005\u5728\u8bbf\u95ee\u5171\u4eab\u53d8\u91cf\u65f6\u9700\u8981\u8fdb\u884c\u9002\u5f53\u7684\u540c\u6b65&#xff0c;\u5982\u56fe 1-3 \u6240\u793a\u3002<br \/>\n\u56fe 1-3<br \/>\n<img decoding=\"async\" src=\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2026\/10\/20261021014120-6ad8184006d27.png\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\" \/><br \/>\n\u540c\u6b65\u7684\u63aa\u65bd\u4e00\u822c\u662f\u52a0\u9501&#xff0c;\u8fd9\u5c31\u9700\u8981\u4f7f\u7528\u8005\u5bf9\u9501\u6709\u4e00\u5b9a\u7684\u4e86\u89e3&#xff0c;\u8fd9\u663e\u7136\u52a0\u91cd\u4e86\u4f7f\u7528\u8005\u7684\u8d1f\u62c5\u3002<br \/>\n\u90a3\u4e48\u6709\u6ca1\u6709\u4e00\u79cd\u65b9\u5f0f\u53ef\u4ee5\u505a\u5230&#xff0c;\u5f53\u521b\u5efa\u4e00\u4e2a\u53d8\u91cf\u540e&#xff0c;\u6bcf\u4e2a\u7ebf\u7a0b\u5bf9\u5176\u8fdb\u884c\u8bbf\u95ee\u7684\u65f6\u5019\u8bbf\u95ee\u7684\u662f\u81ea\u5df1\u7ebf\u7a0b\u7684\u53d8\u91cf\u5462&#xff1f;<br \/>\n\u5176\u5b9e ThreadLocal \u5c31\u53ef\u4ee5\u505a\u8fd9\u4ef6\u4e8b\u60c5&#xff0c;\u867d\u7136 ThreadLocal \u5e76\u4e0d\u662f\u4e3a\u4e86\u89e3\u51b3\u8fd9\u4e2a\u95ee\u9898\u800c\u51fa\u73b0\u7684\u3002<\/p>\n<p>ThreadLocal \u662f JDK \u5305\u63d0\u4f9b\u7684&#xff0c;\u5b83\u63d0\u4f9b\u4e86\u7ebf\u7a0b\u672c\u5730\u53d8\u91cf&#xff0c;<br \/>\n\u4e5f\u5c31\u662f\u5982\u679c\u4f60\u521b\u5efa\u4e86\u4e00\u4e2a ThreadLocal \u53d8\u91cf&#xff0c;\u90a3\u4e48\u8bbf\u95ee\u8fd9\u4e2a\u53d8\u91cf\u7684\u6bcf\u4e2a\u7ebf\u7a0b\u90fd\u4f1a\u6709\u8fd9\u4e2a\u53d8\u91cf\u7684\u4e00\u4e2a\u672c\u5730\u526f\u672c\u3002<br \/>\n\u5f53\u591a\u4e2a\u7ebf\u7a0b\u64cd\u4f5c\u8fd9\u4e2a\u53d8\u91cf\u65f6&#xff0c;\u5b9e\u9645\u64cd\u4f5c\u7684\u662f\u81ea\u5df1\u672c\u5730\u5185\u5b58\u91cc\u9762\u7684\u53d8\u91cf&#xff0c;\u4ece\u800c\u907f\u514d\u4e86\u7ebf\u7a0b\u5b89\u5168\u95ee\u9898\u3002<br \/>\n\u521b\u5efa\u4e00\u4e2a ThreadLocal \u53d8\u91cf\u540e&#xff0c;\u6bcf\u4e2a\u7ebf\u7a0b\u90fd\u4f1a\u590d\u5236\u4e00\u4e2a\u53d8\u91cf\u5230\u81ea\u5df1\u7684\u672c\u5730\u5185\u5b58&#xff0c;\u5982\u56fe 1-4 \u6240\u793a\u3002<\/p>\n<p>\u56fe 1-4<br \/>\n<img decoding=\"async\" src=\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2026\/10\/20261021014120-6ad81840581d5.png\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\" \/><\/p>\n<h3>1.11.1 ThreadLocal \u4f7f\u7528\u793a\u4f8b<\/h3>\n<p>\u672c\u8282\u4ecb\u7ecd\u5982\u4f55\u4f7f\u7528 ThreadLocal\u3002<br \/>\n\u672c\u4f8b\u5f00\u542f\u4e86\u4e24\u4e2a\u7ebf\u7a0b&#xff0c;\u5728\u6bcf\u4e2a\u7ebf\u7a0b\u5185\u90e8\u90fd\u8bbe\u7f6e\u4e86\u672c\u5730\u53d8\u91cf\u7684\u503c&#xff0c;\u7136\u540e\u8c03\u7528 print \u51fd\u6570\u6253\u5370\u5f53\u524d\u672c\u5730\u53d8\u91cf\u7684\u503c\u3002<br \/>\n\u5982\u679c\u6253\u5370\u540e\u8c03\u7528\u4e86\u672c\u5730\u53d8\u91cf\u7684 remove \u65b9\u6cd5&#xff0c;\u5219\u4f1a\u5220\u9664\u672c\u5730\u5185\u5b58\u4e2d\u7684\u8be5\u53d8\u91cf&#xff0c;\u4ee3\u7801\u5982\u4e0b\u3002<\/p>\n<p><span class=\"token keyword\">package<\/span> <span class=\"token namespace\">com<span class=\"token punctuation\">.<\/span>yangjunbo<span class=\"token punctuation\">.<\/span>juc<span class=\"token punctuation\">.<\/span>one<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token keyword\">public<\/span> <span class=\"token keyword\">class<\/span> <span class=\"token class-name\">ThreadLocalTest<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token comment\">\/\/ (1)print\u51fd\u6570<\/span><br \/>\n    <span class=\"token keyword\">static<\/span> <span class=\"token keyword\">void<\/span> <span class=\"token function\">print<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">String<\/span> str<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token comment\">\/\/ 1.1 \u6253\u5370\u5f53\u524d\u7ebf\u7a0b\u672c\u5730\u5185\u5b58\u4e2dlocalVariable\u53d8\u91cf\u7684\u503c<\/span><br \/>\n        <span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span>out<span class=\"token punctuation\">.<\/span><span class=\"token function\">println<\/span><span class=\"token punctuation\">(<\/span>str <span class=\"token operator\">&#043;<\/span> <span class=\"token string\">&#034;:&#034;<\/span> <span class=\"token operator\">&#043;<\/span> localVariable<span class=\"token punctuation\">.<\/span><span class=\"token function\">get<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token comment\">\/\/ 1.2 \u6e05\u9664\u5f53\u524d\u7ebf\u7a0b\u672c\u5730\u5185\u5b58\u4e2d\u7684localVariable\u53d8\u91cf<\/span><br \/>\n        <span class=\"token comment\">\/\/ localVariable.remove();<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    <span class=\"token comment\">\/\/ (2) \u521b\u5efaThreadLocal\u53d8\u91cf<\/span><br \/>\n    <span class=\"token keyword\">static<\/span> <span class=\"token class-name\">ThreadLocal<\/span><span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span><span class=\"token class-name\">String<\/span><span class=\"token punctuation\">&gt;<\/span><\/span> localVariable <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">ThreadLocal<\/span><span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token keyword\">public<\/span> <span class=\"token keyword\">static<\/span> <span class=\"token keyword\">void<\/span> <span class=\"token function\">main<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">String<\/span><span class=\"token punctuation\">[<\/span><span class=\"token punctuation\">]<\/span> args<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token comment\">\/\/ (3) \u521b\u5efa\u7ebf\u7a0bone<\/span><br \/>\n        <span class=\"token class-name\">Thread<\/span> threadOne <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">Thread<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">new<\/span> <span class=\"token class-name\">Runnable<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            <span class=\"token keyword\">public<\/span> <span class=\"token keyword\">void<\/span> <span class=\"token function\">run<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n                <span class=\"token comment\">\/\/ 3.1 \u8bbe\u7f6e\u7ebf\u7a0bOne\u4e2d\u672c\u5730\u53d8\u91cflocalVariable\u7684\u503c<\/span><br \/>\n                localVariable<span class=\"token punctuation\">.<\/span><span class=\"token function\">set<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;threadOne local variable&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n                <span class=\"token comment\">\/\/ 3.2 \u8c03\u7528\u6253\u5370\u51fd\u6570<\/span><br \/>\n                <span class=\"token function\">print<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;threadOne&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n                <span class=\"token comment\">\/\/ 3.3 \u6253\u5370\u672c\u5730\u53d8\u91cf\u503c<\/span><br \/>\n                <span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span>out<span class=\"token punctuation\">.<\/span><span class=\"token function\">println<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;threadOne remove after&#034;<\/span> <span class=\"token operator\">&#043;<\/span> <span class=\"token string\">&#034;:&#034;<\/span> <span class=\"token operator\">&#043;<\/span> localVariable<span class=\"token punctuation\">.<\/span><span class=\"token function\">get<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token punctuation\">}<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token comment\">\/\/ (4) \u521b\u5efa\u7ebf\u7a0btwo<\/span><br \/>\n        <span class=\"token class-name\">Thread<\/span> threadTwo <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">Thread<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">new<\/span> <span class=\"token class-name\">Runnable<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            <span class=\"token keyword\">public<\/span> <span class=\"token keyword\">void<\/span> <span class=\"token function\">run<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n                <span class=\"token comment\">\/\/ 4.1 \u8bbe\u7f6e\u7ebf\u7a0bTwo\u4e2d\u672c\u5730\u53d8\u91cflocalVariable\u7684\u503c<\/span><br \/>\n                localVariable<span class=\"token punctuation\">.<\/span><span class=\"token function\">set<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;threadTwo local variable&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n                <span class=\"token comment\">\/\/ 4.2 \u8c03\u7528\u6253\u5370\u51fd\u6570<\/span><br \/>\n                <span class=\"token function\">print<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;threadTwo&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n                <span class=\"token comment\">\/\/ 4.3 \u6253\u5370\u672c\u5730\u53d8\u91cf\u503c<\/span><br \/>\n                <span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span>out<span class=\"token punctuation\">.<\/span><span class=\"token function\">println<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;threadTwo remove after&#034;<\/span> <span class=\"token operator\">&#043;<\/span> <span class=\"token string\">&#034;:&#034;<\/span> <span class=\"token operator\">&#043;<\/span> localVariable<span class=\"token punctuation\">.<\/span><span class=\"token function\">get<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token punctuation\">}<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token comment\">\/\/ (5)\u542f\u52a8\u7ebf\u7a0b<\/span><br \/>\n        threadOne<span class=\"token punctuation\">.<\/span><span class=\"token function\">start<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        threadTwo<span class=\"token punctuation\">.<\/span><span class=\"token function\">start<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p>\u8fd0\u884c\u7ed3\u679c\u5982\u4e0b\u3002<br \/>\n<img decoding=\"async\" src=\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2026\/10\/20261021014120-6ad8184091314.png\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\" \/><br \/>\n\u4ee3\u7801 (2) \u521b\u5efa\u4e86\u4e00\u4e2a ThreadLocal \u53d8\u91cf\u3002<br \/>\n\u4ee3\u7801 (3) \u548c (4) \u5206\u522b\u521b\u5efa\u4e86\u7ebf\u7a0b One \u548c Two\u3002<br \/>\n\u4ee3\u7801 (5) \u542f\u52a8\u4e86\u4e24\u4e2a\u7ebf\u7a0b\u3002<\/p>\n<p>\u7ebf\u7a0b One \u4e2d\u7684\u4ee3\u7801 3.1 \u901a\u8fc7 set \u65b9\u6cd5\u8bbe\u7f6e\u4e86 localVariable \u7684\u503c&#xff0c;\u8fd9\u5176\u5b9e\u8bbe\u7f6e\u7684\u662f\u7ebf\u7a0b One \u672c\u5730\u5185\u5b58\u4e2d\u7684\u4e00\u4e2a\u526f\u672c&#xff0c;<br \/>\n\u8fd9\u4e2a\u526f\u672c\u7ebf\u7a0b Two \u662f\u8bbf\u95ee\u4e0d\u4e86\u7684\u3002\u7136\u540e\u4ee3\u7801 3.2 \u8c03\u7528\u4e86 print \u51fd\u6570&#xff0c;<br \/>\n\u4ee3\u7801 1.1 \u901a\u8fc7 get \u51fd\u6570\u83b7\u53d6\u4e86\u5f53\u524d\u7ebf\u7a0b&#xff08;\u7ebf\u7a0b One&#xff09;\u672c\u5730\u5185\u5b58\u4e2dlocalVariable \u7684\u503c\u3002<\/p>\n<p>\u7ebf\u7a0b Two \u7684\u6267\u884c\u7c7b\u4f3c\u4e8e\u7ebf\u7a0b One\u3002<\/p>\n<p>\u6253\u5f00\u4ee3\u7801 1.2 \u7684\u6ce8\u91ca\u540e&#xff0c;\u518d\u6b21\u8fd0\u884c&#xff0c;\u8fd0\u884c\u7ed3\u679c\u5982\u4e0b\u3002<br \/>\n<img decoding=\"async\" src=\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2026\/10\/20261021014121-6ad8184168170.png\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\" \/><\/p>\n<h3>1.11.2 ThreadLocal \u7684\u5b9e\u73b0\u539f\u7406<\/h3>\n<p>\u9996\u5148\u770b\u4e00\u4e0b ThreadLocal \u76f8\u5173\u7c7b\u7684\u7c7b\u56fe\u7ed3\u6784&#xff0c;\u5982\u56fe 1-5 \u6240\u793a\u3002<br \/>\n<img decoding=\"async\" src=\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2026\/10\/20261021014122-6ad8184212670.png\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\" \/><br \/>\n\u7531\u8be5\u56fe\u53ef\u77e5&#xff0c;Thread \u7c7b\u4e2d\u6709\u4e00\u4e2a threadLocals \u548c\u4e00\u4e2a inheritableThreadLocals&#xff0c;\u5b83\u4eec\u90fd\u662f ThreadLocalMap \u7c7b\u578b\u7684\u53d8\u91cf&#xff0c;<br \/>\n\u800c ThreadLocalMap \u662f\u4e00\u4e2a\u5b9a\u5236\u5316\u7684 Hashmap\u3002<br \/>\n\u5728\u9ed8\u8ba4\u60c5\u51b5\u4e0b&#xff0c;\u6bcf\u4e2a\u7ebf\u7a0b\u4e2d\u7684\u8fd9\u4e24\u4e2a\u53d8\u91cf\u90fd\u4e3a null&#xff0c;\u53ea\u6709\u5f53\u524d\u7ebf\u7a0b\u7b2c\u4e00\u6b21\u8c03\u7528 ThreadLocal \u7c7b\u578b\u7684\u53d8\u91cf\u7684 set \u6216\u8005 get \u65b9\u6cd5\u65f6\u624d\u4f1a\u521b\u5efa\u5b83\u4eec\u3002<br \/>\n\u5176\u5b9e\u6bcf\u4e2a\u7ebf\u7a0b\u7684\u672c\u5730\u53d8\u91cf\u4e0d\u662f\u5b58\u653e\u5728 ThreadLocal \u7c7b\u578b\u7684\u53d8\u91cf\u91cc\u9762&#xff0c;\u800c\u662f\u5b58\u653e\u5728\u8c03\u7528\u7ebf\u7a0b\u7684 threadLocals \u53d8\u91cf\u91cc\u9762\u3002<br \/>\n\u4e5f\u5c31\u662f\u8bf4&#xff0c;ThreadLocal \u7c7b\u578b\u7684\u672c\u5730\u53d8\u91cf\u5b58\u653e\u5728\u5177\u4f53\u7684\u7ebf\u7a0b\u5185\u5b58\u7a7a\u95f4\u4e2d\u3002<br \/>\nThreadLocal \u7c7b\u578b\u7684\u53d8\u91cf\u5c31\u662f\u4e00\u4e2a\u5de5\u5177\u58f3&#xff0c;\u5b83\u901a\u8fc7 set \u65b9\u6cd5\u628a value \u503c\u653e\u5165\u8c03\u7528\u7ebf\u7a0b\u7684 threadLocals \u53d8\u91cf\u91cc\u9762\u5e76\u5b58\u653e\u8d77\u6765&#xff0c;<br \/>\n\u5f53\u8c03\u7528\u7ebf\u7a0b\u8c03\u7528\u5b83\u7684 get \u65b9\u6cd5\u65f6&#xff0c;\u518d\u4ece\u5f53\u524d\u7ebf\u7a0b\u7684 threadLocals \u53d8\u91cf\u91cc\u9762\u5c06\u5176\u62ff\u51fa\u6765\u4f7f\u7528\u3002<br \/>\n\u5982\u679c\u8c03\u7528\u7ebf\u7a0b\u4e00\u76f4\u4e0d\u7ec8\u6b62&#xff0c;\u90a3\u4e48\u8fd9\u4e2a value \u503c\u4f1a\u4e00\u76f4\u5b58\u653e\u5728\u8c03\u7528\u7ebf\u7a0b\u7684 threadLocals \u53d8\u91cf\u91cc\u9762&#xff0c;<br \/>\n\u6240\u4ee5\u5f53\u4e0d\u9700\u8981\u4f7f\u7528\u8fd9\u4e2a value \u503c\u65f6\u53ef\u4ee5\u901a\u8fc7\u8c03\u7528 ThreadLocal \u7c7b\u578b\u7684\u53d8\u91cf\u7684 remove \u65b9\u6cd5&#xff0c;\u4ece\u5f53\u524d\u7ebf\u7a0b\u7684 threadLocals \u53d8\u91cf\u91cc\u9762\u5220\u9664\u8be5 value \u503c\u3002<br \/>\n\u53e6\u5916&#xff0c;Thread \u91cc\u9762\u7684 threadLocals \u4e3a\u4f55\u88ab\u8bbe\u8ba1\u4e3a map \u7ed3\u6784&#xff1f;\u5f88\u660e\u663e\u662f\u56e0\u4e3a\u6bcf\u4e2a\u7ebf\u7a0b\u53ef\u4ee5\u5173\u8054\u591a\u4e2a ThreadLocal \u7c7b\u578b\u7684\u53d8\u91cf\u3002<\/p>\n<p>\u4e0b\u9762\u7b80\u5355\u5206\u6790 ThreadLocal \u7684 set\u3001get \u53ca remove \u65b9\u6cd5\u7684\u5b9e\u73b0\u903b\u8f91\u3002<\/p>\n<h4>1&#xff0e;void set&#xff08;T value&#xff09;<\/h4>\n<p>    <span class=\"token keyword\">public<\/span> <span class=\"token keyword\">void<\/span> <span class=\"token function\">set<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">T<\/span> value<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token comment\">\/\/(1)\u83b7\u53d6\u5f53\u524d\u7ebf\u7a0b<\/span><br \/>\n        <span class=\"token class-name\">Thread<\/span> t <span class=\"token operator\">&#061;<\/span> <span class=\"token class-name\">Thread<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">currentThread<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token comment\">\/\/(2)\u5c06\u5f53\u524d\u7ebf\u7a0b\u4f5c\u4e3akey&#xff0c;\u53bb\u67e5\u627e\u5bf9\u5e94\u7684\u7ebf\u7a0b\u53d8\u91cf&#xff0c;\u627e\u5230\u5219\u8bbe\u7f6e<\/span><br \/>\n        <span class=\"token class-name\">ThreadLocalMap<\/span> map <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">getMap<\/span><span class=\"token punctuation\">(<\/span>t<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>map <span class=\"token operator\">!<\/span> <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">null<\/span><span class=\"token punctuation\">)<\/span><br \/>\n            map<span class=\"token punctuation\">.<\/span><span class=\"token function\">set<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">this<\/span><span class=\"token punctuation\">,<\/span> value<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">else<\/span><br \/>\n        <span class=\"token comment\">\/\/(3)\u7b2c\u4e00\u6b21\u8c03\u7528\u5c31\u521b\u5efa\u5f53\u524d\u7ebf\u7a0b\u5bf9\u5e94\u7684HashMap<\/span><br \/>\n            <span class=\"token function\">createMap<\/span><span class=\"token punctuation\">(<\/span>t<span class=\"token punctuation\">,<\/span> value<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p><img decoding=\"async\" src=\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2026\/10\/20261021014122-6ad81842659de.png\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\" \/><br \/>\n\u4ee3\u7801&#xff08;1&#xff09;\u9996\u5148\u83b7\u53d6\u8c03\u7528\u7ebf\u7a0b&#xff0c;\u7136\u540e\u4f7f\u7528\u5f53\u524d\u7ebf\u7a0b\u4f5c\u4e3a\u53c2\u6570\u8c03\u7528 getMap(t) \u65b9\u6cd5&#xff0c;getMap(Thread t) \u7684\u4ee3\u7801\u5982\u4e0b\u3002<br \/>\n<img decoding=\"async\" src=\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2026\/10\/20261021014123-6ad81843094f6.png\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\" \/><br \/>\n\u53ef\u4ee5\u770b\u5230&#xff0c;getMap(t) \u7684\u4f5c\u7528\u662f\u83b7\u53d6\u7ebf\u7a0b\u81ea\u5df1\u7684\u53d8\u91cf threadLocals\u3002<\/p>\n<p>\u5982\u679c getMap(t) \u7684\u8fd4\u56de\u503c\u4e0d\u4e3a\u7a7a&#xff0c;\u5219\u628a value \u503c\u8bbe\u7f6e\u5230 threadLocals \u4e2d&#xff0c;<br \/>\n\u4e5f\u5c31\u662f\u628a\u5f53\u524d\u53d8\u91cf\u503c\u653e\u5165\u5f53\u524d\u7ebf\u7a0b\u7684\u5185\u5b58\u53d8\u91cf threadLocals \u4e2d\u3002<br \/>\nthreadLocals \u662f\u4e00\u4e2a HashMap \u7ed3\u6784&#xff0c;\u5176\u4e2d key \u5c31\u662f\u5f53\u524d ThreadLocal \u7684\u5b9e\u4f8b\u5bf9\u8c61\u5f15\u7528&#xff0c;value \u662f\u901a\u8fc7 set \u65b9\u6cd5\u4f20\u9012\u7684\u503c\u3002<\/p>\n<p>\u5982\u679c getMap(t) \u8fd4\u56de\u7a7a\u503c\u5219\u8bf4\u660e\u662f\u7b2c\u4e00\u6b21\u8c03\u7528 set \u65b9\u6cd5&#xff0c;\u8fd9\u65f6\u521b\u5efa\u5f53\u524d\u7ebf\u7a0b\u7684 threadLocals \u53d8\u91cf\u3002\u4e0b\u9762\u6765\u770b createMap(t, value) \u505a\u4ec0\u4e48\u3002<br \/>\n<img decoding=\"async\" src=\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2026\/10\/20261021014123-6ad81843a0539.png\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\" \/><br \/>\n\u5b83\u521b\u5efa\u5f53\u524d\u7ebf\u7a0b\u7684 threadLocals \u53d8\u91cf\u3002<\/p>\n<h4>2&#xff0e;T get&#xff08;\u200b&#xff09;<\/h4>\n<p>    <span class=\"token keyword\">public<\/span> <span class=\"token class-name\">T<\/span> <span class=\"token function\">get<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token comment\">\/\/(4) \u83b7\u53d6\u5f53\u524d\u7ebf\u7a0b<\/span><br \/>\n        <span class=\"token class-name\">Thread<\/span> t <span class=\"token operator\">&#061;<\/span> <span class=\"token class-name\">Thread<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">currentThread<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token comment\">\/\/(5)\u83b7\u53d6\u5f53\u524d\u7ebf\u7a0b\u7684threadLocals\u53d8\u91cf<\/span><br \/>\n        <span class=\"token class-name\">ThreadLocalMap<\/span> map <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">getMap<\/span><span class=\"token punctuation\">(<\/span>t<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token comment\">\/\/(6)\u5982\u679cthreadLocals\u4e0d\u4e3anull&#xff0c;\u5219\u8fd4\u56de\u5bf9\u5e94\u672c\u5730\u53d8\u91cf\u7684\u503c<\/span><br \/>\n        <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>map <span class=\"token operator\">!<\/span> <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">null<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n              <span class=\"token class-name\">ThreadLocalMap<span class=\"token punctuation\">.<\/span>Entry<\/span> e <span class=\"token operator\">&#061;<\/span> map<span class=\"token punctuation\">.<\/span><span class=\"token function\">getEntry<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">this<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>e <span class=\"token operator\">!<\/span> <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">null<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n                <span class=\"token annotation punctuation\">&#064;SuppressWarnings<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;unchecked&#034;<\/span><span class=\"token punctuation\">)<\/span><br \/>\n                <span class=\"token class-name\">T<\/span> result <span class=\"token operator\">&#061;<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token class-name\">T<\/span><span class=\"token punctuation\">)<\/span>e<span class=\"token punctuation\">.<\/span>value<span class=\"token punctuation\">;<\/span><br \/>\n                <span class=\"token keyword\">return<\/span> result<span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token punctuation\">}<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><br \/>\n        <span class=\"token comment\">\/\/(7)threadLocals\u4e3a\u7a7a\u5219\u521d\u59cb\u5316\u5f53\u524d\u7ebf\u7a0b\u7684threadLocals\u6210\u5458\u53d8\u91cf<\/span><br \/>\n                <span class=\"token keyword\">return<\/span> <span class=\"token function\">setInitialValue<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>\u4ee3\u7801&#xff08;4&#xff09;\u9996\u5148\u83b7\u53d6\u5f53\u524d\u7ebf\u7a0b\u5b9e\u4f8b&#xff0c;\u5982\u679c\u5f53\u524d\u7ebf\u7a0b\u7684 threadLocals \u53d8\u91cf\u4e0d\u4e3a null&#xff0c;\u5219\u76f4\u63a5\u8fd4\u56de\u5f53\u524d\u7ebf\u7a0b\u7ed1\u5b9a\u7684\u672c\u5730\u53d8\u91cf&#xff0c;<br \/>\n\u5426\u5219\u6267\u884c\u4ee3\u7801&#xff08;7&#xff09;\u8fdb\u884c\u521d\u59cb\u5316\u3002setInitialValue() \u7684\u4ee3\u7801\u5982\u4e0b\u3002<\/p>\n<p>    <span class=\"token keyword\">private<\/span> <span class=\"token class-name\">T<\/span> <span class=\"token function\">setInitialValue<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token comment\">\/\/(8)\u521d\u59cb\u5316\u4e3anull<\/span><br \/>\n        <span class=\"token class-name\">T<\/span> value <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">initialValue<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token class-name\">Thread<\/span> t <span class=\"token operator\">&#061;<\/span> <span class=\"token class-name\">Thread<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">currentThread<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token class-name\">ThreadLocalMap<\/span> map <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">getMap<\/span><span class=\"token punctuation\">(<\/span>t<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token comment\">\/\/(9)\u5982\u679c\u5f53\u524d\u7ebf\u7a0b\u7684threadLocals\u53d8\u91cf\u4e0d\u4e3a\u7a7a<\/span><br \/>\n        <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>map <span class=\"token operator\">!<\/span> <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">null<\/span><span class=\"token punctuation\">)<\/span><br \/>\n            map<span class=\"token punctuation\">.<\/span><span class=\"token function\">set<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">this<\/span><span class=\"token punctuation\">,<\/span> value<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">else<\/span><br \/>\n        <span class=\"token comment\">\/\/(10)\u5982\u679c\u5f53\u524d\u7ebf\u7a0b\u7684threadLocals\u53d8\u91cf\u4e3a\u7a7a<\/span><br \/>\n            <span class=\"token function\">createMap<\/span><span class=\"token punctuation\">(<\/span>t<span class=\"token punctuation\">,<\/span> value<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">return<\/span> value<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n    <span class=\"token keyword\">protected<\/span> <span class=\"token class-name\">T<\/span> <span class=\"token function\">initialValue<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token keyword\">return<\/span> <span class=\"token keyword\">null<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>\u5982\u679c\u5f53\u524d\u7ebf\u7a0b\u7684 threadLocals \u53d8\u91cf\u4e0d\u4e3a\u7a7a&#xff0c;\u5219\u8bbe\u7f6e\u5f53\u524d\u7ebf\u7a0b\u7684\u672c\u5730\u53d8\u91cf\u503c\u4e3a null&#xff0c;\u5426\u5219\u8c03\u7528 createMap \u65b9\u6cd5\u521b\u5efa\u5f53\u524d\u7ebf\u7a0b\u7684 threadLocals \u53d8\u91cf\u3002<\/p>\n<h4>3&#xff0e;void remove&#xff08;\u200b&#xff09;<\/h4>\n<p><img decoding=\"async\" src=\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2026\/10\/20261021014124-6ad8184445efd.png\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\" \/><br \/>\n\u5982\u4ee5\u4e0a\u4ee3\u7801\u6240\u793a&#xff0c;\u5982\u679c\u5f53\u524d\u7ebf\u7a0b\u7684 threadLocals \u53d8\u91cf\u4e0d\u4e3a\u7a7a&#xff0c;\u5219\u5220\u9664\u5f53\u524d\u7ebf\u7a0b\u4e2d\u6307\u5b9a ThreadLocal \u5b9e\u4f8b\u7684\u672c\u5730\u53d8\u91cf\u3002<\/p>\n<p>\u603b\u7ed3&#xff1a;\u5982\u56fe 1-6 \u6240\u793a&#xff0c;\u5728\u6bcf\u4e2a\u7ebf\u7a0b\u5185\u90e8\u90fd\u6709\u4e00\u4e2a\u540d\u4e3a threadLocals \u7684\u6210\u5458\u53d8\u91cf&#xff0c;\u8be5\u53d8\u91cf\u7684\u7c7b\u578b\u4e3a HashMap&#xff0c;<br \/>\n\u5176\u4e2d key \u4e3a\u6211\u4eec\u5b9a\u4e49\u7684 ThreadLocal \u53d8\u91cf\u7684 this \u5f15\u7528&#xff0c;value \u5219\u4e3a\u6211\u4eec\u4f7f\u7528 set \u65b9\u6cd5\u8bbe\u7f6e\u7684\u503c\u3002<br \/>\n\u6bcf\u4e2a\u7ebf\u7a0b\u7684\u672c\u5730\u53d8\u91cf\u5b58\u653e\u5728\u7ebf\u7a0b\u81ea\u5df1\u7684\u5185\u5b58\u53d8\u91cf threadLocals \u4e2d&#xff0c;\u5982\u679c\u5f53\u524d\u7ebf\u7a0b\u4e00\u76f4\u4e0d\u6d88\u4ea1&#xff0c;\u90a3\u4e48\u8fd9\u4e9b\u672c\u5730\u53d8\u91cf\u4f1a\u4e00\u76f4\u5b58\u5728&#xff0c;\u6240\u4ee5\u53ef\u80fd\u4f1a\u9020\u6210\u5185\u5b58\u6ea2\u51fa&#xff0c;<br \/>\n\u56e0\u6b64\u4f7f\u7528\u5b8c\u6bd5\u540e\u8981\u8bb0\u5f97\u8c03\u7528 ThreadLocal \u7684 remove \u65b9\u6cd5\u5220\u9664\u5bf9\u5e94\u7ebf\u7a0b\u7684 threadLocals \u4e2d\u7684\u672c\u5730\u53d8\u91cf\u3002<br \/>\n\u5728\u9ad8\u7ea7\u7bc7\u8981\u8bb2\u89e3\u7684 JUC \u5305\u91cc\u9762\u7684 ThreadLocalRandom&#xff0c;\u5c31\u662f\u501f\u9274 ThreadLocal \u7684\u601d\u60f3\u5b9e\u73b0\u7684&#xff0c;\u540e\u9762\u4f1a\u5177\u4f53\u8bb2\u89e3\u3002<\/p>\n<p>\u56fe 1-6<br \/>\n<img decoding=\"async\" src=\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2026\/10\/20261021014124-6ad81844dded5.png\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\" \/><\/p>\n<h3>1.11.3 ThreadLocal \u4e0d\u652f\u6301\u7ee7\u627f\u6027<\/h3>\n<p>\u9996\u5148\u770b\u4e00\u4e2a\u4f8b\u5b50\u3002<\/p>\n<p><span class=\"token keyword\">package<\/span> <span class=\"token namespace\">com<span class=\"token punctuation\">.<\/span>yangjunbo<span class=\"token punctuation\">.<\/span>juc<span class=\"token punctuation\">.<\/span>one<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token comment\">\/**<br \/>\n * ClassName: TestThreadLocal<br \/>\n * Package: com.yangjunbo.juc.one<br \/>\n * Description:<br \/>\n *<br \/>\n * &#064;Author \u6768\u94a7\u535a<br \/>\n * &#064;Create 2026\/10\/20 9:53<br \/>\n * &#064;Version 1.0<br \/>\n *\/<\/span><br \/>\n<span class=\"token keyword\">public<\/span> <span class=\"token keyword\">class<\/span> <span class=\"token class-name\">TestThreadLocal<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token comment\">\/\/(1)\u521b\u5efa\u7ebf\u7a0b\u53d8\u91cf<\/span><br \/>\n    <span class=\"token keyword\">public<\/span> <span class=\"token keyword\">static<\/span> <span class=\"token class-name\">ThreadLocal<\/span><span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span><span class=\"token class-name\">String<\/span><span class=\"token punctuation\">&gt;<\/span><\/span> threadLocal <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">ThreadLocal<\/span><span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span><span class=\"token class-name\">String<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token keyword\">public<\/span> <span class=\"token keyword\">static<\/span> <span class=\"token keyword\">void<\/span> <span class=\"token function\">main<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">String<\/span><span class=\"token punctuation\">[<\/span><span class=\"token punctuation\">]<\/span> args<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token comment\">\/\/(2) \u8bbe\u7f6e\u7ebf\u7a0b\u53d8\u91cf<\/span><br \/>\n        threadLocal<span class=\"token punctuation\">.<\/span><span class=\"token function\">set<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;hello world&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token comment\">\/\/(3) \u542f\u52a8\u5b50\u7ebf\u7a0b<\/span><br \/>\n        <span class=\"token class-name\">Thread<\/span> thread <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">Thread<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">new<\/span> <span class=\"token class-name\">Runnable<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            <span class=\"token keyword\">public<\/span> <span class=\"token keyword\">void<\/span> <span class=\"token function\">run<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n                <span class=\"token comment\">\/\/(4) \u5b50\u7ebf\u7a0b\u8f93\u51fa\u7ebf\u7a0b\u53d8\u91cf\u7684\u503c<\/span><br \/>\n                <span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span>out<span class=\"token punctuation\">.<\/span><span class=\"token function\">println<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;thread:&#034;<\/span> <span class=\"token operator\">&#043;<\/span> threadLocal<span class=\"token punctuation\">.<\/span><span class=\"token function\">get<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token punctuation\">}<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        thread<span class=\"token punctuation\">.<\/span><span class=\"token function\">start<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token comment\">\/\/(5) \u4e3b\u7ebf\u7a0b\u8f93\u51fa\u7ebf\u7a0b\u53d8\u91cf\u7684\u503c<\/span><br \/>\n        <span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span>out<span class=\"token punctuation\">.<\/span><span class=\"token function\">println<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;main:&#034;<\/span> <span class=\"token operator\">&#043;<\/span> threadLocal<span class=\"token punctuation\">.<\/span><span class=\"token function\">get<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p>\u8f93\u51fa\u7ed3\u679c\u5982\u4e0b\u3002<br \/>\n<img decoding=\"async\" src=\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2026\/10\/20261021014125-6ad8184525c82.png\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\" \/><br \/>\n\u4e5f\u5c31\u662f\u8bf4&#xff0c;\u540c\u4e00\u4e2a ThreadLocal \u53d8\u91cf\u5728\u7236\u7ebf\u7a0b\u4e2d\u88ab\u8bbe\u7f6e\u503c\u540e&#xff0c;\u5728\u5b50\u7ebf\u7a0b\u4e2d\u662f\u83b7\u53d6\u4e0d\u5230\u7684\u3002<br \/>\n\u6839\u636e\u4e0a\u8282\u7684\u4ecb\u7ecd&#xff0c;\u8fd9\u5e94\u8be5\u662f\u6b63\u5e38\u73b0\u8c61&#xff0c;\u56e0\u4e3a\u5728\u5b50\u7ebf\u7a0b thread \u91cc\u9762\u8c03\u7528get\u65b9\u6cd5\u65f6\u5f53\u524d\u7ebf\u7a0b\u4e3a thread \u7ebf\u7a0b&#xff0c;<br \/>\n\u800c\u8fd9\u91cc\u8c03\u7528 set \u65b9\u6cd5\u8bbe\u7f6e\u7ebf\u7a0b\u53d8\u91cf\u7684\u662f main \u7ebf\u7a0b&#xff0c;\u4e24\u8005\u662f\u4e0d\u540c\u7684\u7ebf\u7a0b&#xff0c;\u81ea\u7136\u5b50\u7ebf\u7a0b\u8bbf\u95ee\u65f6\u8fd4\u56de null\u3002<br \/>\n\u90a3\u4e48\u6709\u6ca1\u6709\u529e\u6cd5\u8ba9\u5b50\u7ebf\u7a0b\u80fd\u8bbf\u95ee\u5230\u7236\u7ebf\u7a0b\u4e2d\u7684\u503c&#xff1f;\u7b54\u6848\u662f\u6709\u3002<\/p>\n<h3>1.11.4 InheritableThreadLocal \u7c7b<\/h3>\n<p>\u4e3a\u4e86\u89e3\u51b3\u4e0a\u8282\u63d0\u51fa\u7684\u95ee\u9898&#xff0c;InheritableThreadLocal \u5e94\u8fd0\u800c\u751f\u3002InheritableThreadLocal \u7ee7\u627f\u81ea ThreadLocal&#xff0c;\u5176\u63d0\u4f9b\u4e86\u4e00\u4e2a\u7279\u6027&#xff0c;\u5c31\u662f\u8ba9\u5b50\u7ebf\u7a0b\u53ef\u4ee5\u8bbf\u95ee\u5728\u7236\u7ebf\u7a0b\u4e2d\u8bbe\u7f6e\u7684\u672c\u5730\u53d8\u91cf\u3002\u4e0b\u9762\u770b\u4e00\u4e0b InheritableThreadLocal \u7684\u4ee3\u7801\u3002<br \/>\n<img decoding=\"async\" src=\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2026\/10\/20261021014125-6ad81845bb233.png\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\" \/><br \/>\n\u7531\u5982\u4e0a\u4ee3\u7801\u53ef\u77e5&#xff0c;InheritableThreadLocal \u7ee7\u627f\u4e86 ThreadLocal&#xff0c;\u5e76\u91cd\u5199\u4e86\u4e09\u4e2a\u65b9\u6cd5\u3002<br \/>\n\u7531\u4ee3\u7801&#xff08;3&#xff09;\u53ef\u77e5&#xff0c;InheritableThreadLocal \u91cd\u5199\u4e86 createMap \u65b9\u6cd5&#xff0c;<br \/>\n\u90a3\u4e48\u73b0\u5728\u5f53\u7b2c\u4e00\u6b21\u8c03\u7528 set \u65b9\u6cd5\u65f6&#xff0c;\u521b\u5efa\u7684\u662f\u5f53\u524d\u7ebf\u7a0b\u7684 inheritableThreadLocals \u53d8\u91cf\u800c\u4e0d\u518d\u662f threadLocals\u3002<br \/>\n\u7531\u4ee3\u7801&#xff08;2&#xff09;\u53ef\u77e5&#xff0c;\u5f53\u8c03\u7528 get \u65b9\u6cd5\u83b7\u53d6\u5f53\u524d\u7ebf\u7a0b\u5185\u90e8\u7684 map \u53d8\u91cf\u65f6&#xff0c;\u83b7\u53d6\u7684\u662f inheritableThreadLocals \u800c\u4e0d\u518d\u662f threadLocals\u3002<\/p>\n<p>\u7efc\u4e0a\u53ef\u77e5&#xff0c;\u5728 InheritableThreadLocal \u7684\u4e16\u754c\u91cc&#xff0c;\u53d8\u91cf inheritableThreadLocals \u66ff\u4ee3\u4e86 threadLocals\u3002<\/p>\n<p>\u4e0b\u9762\u6211\u4eec\u770b\u4e00\u4e0b\u91cd\u5199\u7684\u4ee3\u7801&#xff08;1&#xff09;\u4f55\u65f6\u6267\u884c&#xff0c;\u4ee5\u53ca\u5982\u4f55\u8ba9\u5b50\u7ebf\u7a0b\u53ef\u4ee5\u8bbf\u95ee\u7236\u7ebf\u7a0b\u7684\u672c\u5730\u53d8\u91cf\u3002<br \/>\n\u8fd9\u8981\u4ece\u521b\u5efa Thread \u7684\u4ee3\u7801\u8bf4\u8d77&#xff0c;\u6253\u5f00 Thread \u7c7b\u7684\u9ed8\u8ba4\u6784\u9020\u51fd\u6570&#xff0c;\u4ee3\u7801\u5982\u4e0b\u3002<br \/>\n<img decoding=\"async\" src=\"2026-10-21lr05unmn2vs.png\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\" \/><br \/>\n<img decoding=\"async\" src=\"2026-10-21orqgjklhkmc.png\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\" \/><\/p>\n<p>    <span class=\"token keyword\">public<\/span> <span class=\"token class-name\">Thread<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">Runnable<\/span> target<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n     <span class=\"token function\">init<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">null<\/span><span class=\"token punctuation\">,<\/span> target<span class=\"token punctuation\">,<\/span> <span class=\"token string\">&#034;Thread-&#034;<\/span> <span class=\"token operator\">&#043;<\/span> <span class=\"token function\">nextThreadNum<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n  <span class=\"token punctuation\">}<\/span><br \/>\n   <span class=\"token keyword\">private<\/span> <span class=\"token keyword\">void<\/span> <span class=\"token function\">init<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">ThreadGroup<\/span> g<span class=\"token punctuation\">,<\/span> <span class=\"token class-name\">Runnable<\/span> target<span class=\"token punctuation\">,<\/span> <span class=\"token class-name\">String<\/span> name<span class=\"token punctuation\">,<\/span><br \/>\n                  <span class=\"token keyword\">long<\/span> stackSize<span class=\"token punctuation\">,<\/span> <span class=\"token class-name\">AccessControlContext<\/span> acc<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token punctuation\">.<\/span><span class=\"token punctuation\">.<\/span><span class=\"token punctuation\">.<\/span><br \/>\n        <span class=\"token comment\">\/\/(4)\u83b7\u53d6\u5f53\u524d\u7ebf\u7a0b<\/span><br \/>\n        <span class=\"token class-name\">Thread<\/span> parent <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">currentThread<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token punctuation\">.<\/span><span class=\"token punctuation\">.<\/span><span class=\"token punctuation\">.<\/span><br \/>\n        <span class=\"token comment\">\/\/(5)\u5982\u679c\u7236\u7ebf\u7a0b\u7684inheritableThreadLocals\u53d8\u91cf\u4e0d\u4e3anull<\/span><br \/>\n        <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>parent<span class=\"token punctuation\">.<\/span>inheritableThreadLocals <span class=\"token operator\">!<\/span> <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">null<\/span><span class=\"token punctuation\">)<\/span><br \/>\n        <span class=\"token comment\">\/\/(6)\u8bbe\u7f6e\u5b50\u7ebf\u7a0b\u4e2d\u7684inheritableThreadLocals\u53d8\u91cf<\/span><br \/>\n        <span class=\"token keyword\">this<\/span><span class=\"token punctuation\">.<\/span>inheritableThreadLocals <span class=\"token operator\">&#061;<\/span><br \/>\n  <span class=\"token class-name\">ThreadLocal<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">createInheritedMap<\/span><span class=\"token punctuation\">(<\/span>parent<span class=\"token punctuation\">.<\/span>inheritableThreadLocals<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n     <span class=\"token keyword\">this<\/span><span class=\"token punctuation\">.<\/span>stackSize <span class=\"token operator\">&#061;<\/span> stackSize<span class=\"token punctuation\">;<\/span><br \/>\n     tid <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">nextThreadID<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n  <span class=\"token punctuation\">}<\/span><\/p>\n<p>\u5982\u4e0a\u4ee3\u7801\u5728\u521b\u5efa\u7ebf\u7a0b\u65f6&#xff0c;\u5728\u6784\u9020\u51fd\u6570\u91cc\u9762\u4f1a\u8c03\u7528 init \u65b9\u6cd5\u3002<br \/>\n\u4ee3\u7801&#xff08;4&#xff09;\u83b7\u53d6\u4e86\u5f53\u524d\u7ebf\u7a0b&#xff08;\u8fd9\u91cc\u662f\u6307 main \u51fd\u6570\u6240\u5728\u7684\u7ebf\u7a0b&#xff0c;\u4e5f\u5c31\u662f\u7236\u7ebf\u7a0b&#xff09;\u200b&#xff0c;<br \/>\n\u7136\u540e\u4ee3\u7801&#xff08;5&#xff09;\u5224\u65ad main \u51fd\u6570\u6240\u5728\u7ebf\u7a0b\u91cc\u9762\u7684 inheritableThreadLocals \u5c5e\u6027\u662f\u5426\u4e3a null&#xff0c;<br \/>\n\u524d\u9762\u6211\u4eec\u8bb2\u4e86 InheritableThreadLocal \u7c7b\u7684 get \u548c set \u65b9\u6cd5\u64cd\u4f5c\u7684\u662f inheritableThreadLocals&#xff0c;<br \/>\n\u6240\u4ee5\u8fd9\u91cc\u7684 inheritableThreadLocal \u53d8\u91cf\u4e0d\u4e3a null&#xff0c;\u56e0\u6b64\u4f1a\u6267\u884c\u4ee3\u7801&#xff08;6&#xff09;\u200b\u3002<br \/>\n\u4e0b\u9762\u770b\u4e00\u4e0b createInheritedMap \u7684\u4ee3\u7801\u3002<\/p>\n<p>    <span class=\"token keyword\">static<\/span> <span class=\"token class-name\">ThreadLocalMap<\/span> <span class=\"token function\">createInheritedMap<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">ThreadLocalMap<\/span> parentMap<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token keyword\">return<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">ThreadLocalMap<\/span><span class=\"token punctuation\">(<\/span>parentMap<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>\u53ef\u4ee5\u770b\u5230&#xff0c;\u5728 createInheritedMap \u5185\u90e8\u4f7f\u7528\u7236\u7ebf\u7a0b\u7684 inheritableThreadLocals \u53d8\u91cf\u4f5c\u4e3a\u6784\u9020\u51fd\u6570\u7684\u53c2\u6570\u521b\u5efa\u4e86\u4e00\u4e2a\u65b0\u7684 ThreadLocalMap \u53d8\u91cf&#xff0c;\u7136\u540e\u8d4b\u503c\u7ed9\u4e86\u5b50\u7ebf\u7a0b\u7684 inheritableThreadLocals \u53d8\u91cf\u3002<br \/>\n\u4e0b\u9762\u6211\u4eec\u770b\u770b\u5728 ThreadLocalMap \u7684\u6784\u9020\u51fd\u6570\u5185\u90e8\u90fd\u505a\u4e86\u4ec0\u4e48\u4e8b\u60c5\u3002<\/p>\n<p><span class=\"token keyword\">private<\/span> <span class=\"token class-name\">ThreadLocalMap<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">ThreadLocalMap<\/span> parentMap<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            <span class=\"token class-name\">Entry<\/span><span class=\"token punctuation\">[<\/span><span class=\"token punctuation\">]<\/span> parentTable <span class=\"token operator\">&#061;<\/span> parentMap<span class=\"token punctuation\">.<\/span>table<span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token keyword\">int<\/span> len <span class=\"token operator\">&#061;<\/span> parentTable<span class=\"token punctuation\">.<\/span>length<span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token function\">setThreshold<\/span><span class=\"token punctuation\">(<\/span>len<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            table <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">Entry<\/span><span class=\"token punctuation\">[<\/span>len<span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token keyword\">for<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token keyword\">int<\/span> j <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">;<\/span> j <span class=\"token operator\">&lt;<\/span> len<span class=\"token punctuation\">;<\/span> j<span class=\"token operator\">&#043;&#043;<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n                <span class=\"token class-name\">Entry<\/span> e <span class=\"token operator\">&#061;<\/span> parentTable<span class=\"token punctuation\">[<\/span>j<span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">;<\/span><br \/>\n                <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>e <span class=\"token operator\">!<\/span> <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">null<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n                    <span class=\"token annotation punctuation\">&#064;SuppressWarnings<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;unchecked&#034;<\/span><span class=\"token punctuation\">)<\/span><br \/>\n                    <span class=\"token class-name\">ThreadLocal<\/span><span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span><span class=\"token class-name\">Object<\/span><span class=\"token punctuation\">&gt;<\/span><\/span> key <span class=\"token operator\">&#061;<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token class-name\">ThreadLocal<\/span><span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span><span class=\"token class-name\">Object<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><span class=\"token punctuation\">)<\/span> e<span class=\"token punctuation\">.<\/span><span class=\"token function\">get<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n                    <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>key <span class=\"token operator\">!<\/span> <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">null<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n                        <span class=\"token comment\">\/\/(7)\u8c03\u7528\u91cd\u5199\u7684\u65b9\u6cd5<\/span><br \/>\n                        <span class=\"token class-name\">Object<\/span> value <span class=\"token operator\">&#061;<\/span> key<span class=\"token punctuation\">.<\/span><span class=\"token function\">childValue<\/span><span class=\"token punctuation\">(<\/span>e<span class=\"token punctuation\">.<\/span>value<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token comment\">\/\/\u8fd4\u56dee.value<\/span><br \/>\n                        <span class=\"token class-name\">Entry<\/span> c <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">Entry<\/span><span class=\"token punctuation\">(<\/span>key<span class=\"token punctuation\">,<\/span> value<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n                        <span class=\"token keyword\">int<\/span> h <span class=\"token operator\">&#061;<\/span> key<span class=\"token punctuation\">.<\/span>threadLocalHashCode <span class=\"token operator\">&amp;<\/span> <span class=\"token punctuation\">(<\/span>len <span class=\"token operator\">&#8211;<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n                        <span class=\"token keyword\">while<\/span> <span class=\"token punctuation\">(<\/span>table<span class=\"token punctuation\">[<\/span>h<span class=\"token punctuation\">]<\/span> <span class=\"token operator\">!<\/span> <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">null<\/span><span class=\"token punctuation\">)<\/span><br \/>\n                            h <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">nextIndex<\/span><span class=\"token punctuation\">(<\/span>h<span class=\"token punctuation\">,<\/span> len<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n                        table<span class=\"token punctuation\">[<\/span>h<span class=\"token punctuation\">]<\/span> <span class=\"token operator\">&#061;<\/span> c<span class=\"token punctuation\">;<\/span><br \/>\n                        size<span class=\"token operator\">&#043;&#043;<\/span><span class=\"token punctuation\">;<\/span><br \/>\n                    <span class=\"token punctuation\">}<\/span><br \/>\n                <span class=\"token punctuation\">}<\/span><br \/>\n            <span class=\"token punctuation\">}<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><\/p>\n<p>\u5728\u8be5\u6784\u9020\u51fd\u6570\u5185\u90e8\u628a\u7236\u7ebf\u7a0b\u7684 inheritableThreadLocals \u6210\u5458\u53d8\u91cf\u7684\u503c\u590d\u5236\u5230\u65b0\u7684 ThreadLocalMap \u5bf9\u8c61\u4e2d&#xff0c;inheritableThreadLocals \u6210\u5458\u53d8\u91cf\u7c7b\u578b\u4e5f\u662f ThreadLocalMap&#xff0c;\u7b49\u4e8e\u662f\u521b\u5efa\u4e00\u4e2a\u65b0\u7684 ThreadLocalMap \u7c7b\u578b\u7684\u5bf9\u8c61\u3002<br \/>\n\u5176\u4e2d\u4ee3\u7801&#xff08;7&#xff09;\u8c03\u7528\u4e86 InheritableThreadLocal \u7c7b\u91cd\u5199\u7684\u4ee3\u7801&#xff08;1&#xff09;\u200b\u3002<\/p>\n<p>\u603b\u7ed3&#xff1a;InheritableThreadLocal \u7c7b\u901a\u8fc7\u91cd\u5199\u4ee3\u7801&#xff08;2&#xff09;\u548c&#xff08;3&#xff09;\u8ba9\u672c\u5730\u53d8\u91cf\u4fdd\u5b58\u5230\u4e86\u5177\u4f53\u7ebf\u7a0b\u7684 inheritableThreadLocals \u53d8\u91cf\u91cc\u9762&#xff0c;<br \/>\n\u90a3\u4e48\u7ebf\u7a0b\u5728\u901a\u8fc7 InheritableThreadLocal \u7c7b\u5b9e\u4f8b\u7684 set \u6216\u8005 get \u65b9\u6cd5\u8bbe\u7f6e\u53d8\u91cf\u65f6&#xff0c;\u5c31\u4f1a\u521b\u5efa\u5f53\u524d\u7ebf\u7a0b\u7684 inheritableThreadLocals \u53d8\u91cf\u3002<br \/>\n\u5f53\u7236\u7ebf\u7a0b\u521b\u5efa\u5b50\u7ebf\u7a0b\u65f6&#xff0c;\u6784\u9020\u51fd\u6570\u4f1a\u628a\u7236\u7ebf\u7a0b\u91cc\u9762\u7684\u672c\u5730\u53d8\u91cf inheritableThreadLocals \u590d\u5236\u4e00\u4efd\u4fdd\u5b58\u5230\u5b50\u7ebf\u7a0b\u7684 inheritableThreadLocals \u53d8\u91cf\u91cc\u9762\u3002<\/p>\n<p>\u628a 1.11.3 \u8282\u4e2d\u7684\u4ee3\u7801&#xff08;1&#xff09;\u4fee\u6539\u4e3a<\/p>\n<p>    <span class=\"token comment\">\/\/(1) \u521b\u5efa\u7ebf\u7a0b\u53d8\u91cf<\/span><br \/>\n    <span class=\"token keyword\">public<\/span> <span class=\"token keyword\">static<\/span> <span class=\"token class-name\">ThreadLocal<\/span><span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span><span class=\"token class-name\">String<\/span><span class=\"token punctuation\">&gt;<\/span><\/span> threadLocal <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">InheritableThreadLocal<\/span><span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span><span class=\"token class-name\">String<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>\u8fd0\u884c\u7ed3\u679c\u5982\u4e0b\u3002<br \/>\n<img decoding=\"async\" src=\"2026-10-21eqaghrm5gex.png\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\" \/><br \/>\n\u53ef\u89c1&#xff0c;\u73b0\u5728\u53ef\u4ee5\u4ece\u5b50\u7ebf\u7a0b\u6b63\u5e38\u83b7\u53d6\u5230\u7236\u7ebf\u7a0b\u53d8\u91cf\u7684\u503c\u4e86\u3002<\/p>\n<p>\u90a3\u4e48\u5728\u4ec0\u4e48\u60c5\u51b5\u4e0b\u9700\u8981\u5b50\u7ebf\u7a0b\u9700\u8981\u83b7\u53d6\u7236\u7ebf\u7a0b\u7684 threadlocal 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