{"id":66342,"date":"2026-01-26T18:05:07","date_gmt":"2026-01-26T10:05:07","guid":{"rendered":"https:\/\/www.wsisp.com\/helps\/66342.html"},"modified":"2026-01-26T18:05:07","modified_gmt":"2026-01-26T10:05:07","slug":"%e3%80%90java%e6%95%b0%e6%8d%ae%e7%b1%bb%e5%9e%8b%e3%80%91","status":"publish","type":"post","link":"https:\/\/www.wsisp.com\/helps\/66342.html","title":{"rendered":"\u3010Java\u6570\u636e\u7c7b\u578b\u3011"},"content":{"rendered":"<\/p>\n<h4>\u6587\u7ae0\u76ee\u5f55<\/h4>\n<ul>\n<li>\n<ul>\n<li>\n<ul>\n<li>\u5b57\u9762\u5e38\u91cf<\/li>\n<li>\u6570\u636e\u7c7b\u578b<\/li>\n<li>\u4ec0\u4e48\u662f\u5b57\u8282?<\/li>\n<li>\u53d8\u91cf<\/li>\n<li>\u7c7b\u578b\u8f6c\u6362<\/li>\n<li>\u7c7b\u578b\u63d0\u5347<\/li>\n<li>\u5b57\u7b26\u4e32\u7c7b\u578b<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<h4>\u5b57\u9762\u5e38\u91cf<\/h4>\n<p>\u5b9a\u4e49&#xff1a;\u5e38\u91cf\u5373\u7a0b\u5e8f\u8fd0\u884c\u671f\u95f4&#xff0c;\u56fa\u5b9a\u4e0d\u53d8\u7684\u91cf\u79f0\u4e3a\u5e38\u91cf\u3002<\/p>\n<p>\u5206\u7c7b&#xff1a;<\/p>\n<li>\u5b57\u7b26\u4e32\u5e38\u91cf&#xff1a;\u7531&#034;&#034;\u62ec\u8d77\u6765\u7684&#xff0c;\u5982\u201c12345\u201d\u3001\u201chello\u201d\u3001\u201c\u4f60\u597d\u201d\u3002<\/li>\n<li>\u6574\u5f62\u5e38\u91cf&#xff1a;\u5982&#xff1a;100\u30011000<\/li>\n<li>\u6d6e\u70b9\u6570\u5e38\u91cf&#xff1a;\u5982&#xff1a;3.14\u30010.49<\/li>\n<li>\u5b57\u7b26\u5e38\u91cf&#xff1a;\u7531\u5355\u5f15\u53f7\u62ec\u8d77\u6765\u7684\u5f53\u4e2a\u5b57\u7b26&#xff0c;\u5982&#xff1a;\u2018A\u2019\u3001\u20181\u2019<\/li>\n<li>\u5e03\u5c14\u5e38\u91cf&#xff1a;\u53ea\u6709true\u548cfalse<\/li>\n<li>\u7a7a\u5e38\u91cf&#xff1a;null<\/li>\n<h4>\u6570\u636e\u7c7b\u578b<\/h4>\n<p>\u4e24\u7c7b&#xff1a;\u57fa\u672c\u6570\u636e\u7c7b\u578b&#xff08;\u56db\u7c7b\u516b\u79cd&#xff09;\u548c\u5f15\u7528\u6570\u636e\u7c7b\u578b\u3002\u56db\u7c7b&#xff1a;\u6574\u578b&#xff0c;\u6d6e\u70b9\u578b&#xff0c;\u5b57\u7b26\u578b&#xff0c;\u5e03\u5c14\u578b\u3002&#xff08;\u5b57\u7b26\u4e32\u662f\u5f15\u7528\u7c7b\u578b&#xff09;<\/p>\n<p>\u8865\u5145\u77e5\u8bc6&#xff1a; \u5305\u88c5\u7c7b\u6307\u7684\u662f&#xff0c;\u57fa\u672c\u6570\u636e\u7c7b\u578b\u5bf9\u5e94\u7684\u7c7b\u7c7b\u578b\u3002\u56e0\u4e3a\u57fa\u672c\u6570\u636e\u7c7b\u578b\u65e0\u6cd5\u8fdb\u884c\u5bf9\u8c61\u5316\u5904\u7406&#xff0c;\u6240\u4ee5\u5c31\u5f15\u5165\u4e86\u5305\u88c5\u7c7b\u3002 <img decoding=\"async\" src=\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2026\/01\/20260126100506-69773c520f537.png\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\" \/><\/p>\n<li>float\u548cdoubel\u7c7b\u578b\u90fd\u6709\u7cbe\u5ea6\u635f\u5931\u3002<\/li>\n<li>\u6d6e\u70b9\u7c7b\u578bfloat\u3001double\u7684\u6570\u636e\u4e0d\u9002\u5408\u5728\u4e0d\u5bb9\u8bb8\u820d\u5165\u8bef\u5dee\u7684\u91d1\u878d\u8ba1\u7b97\u9886\u57df\u3002\u5982\u679c\u9700\u8981\u7cbe\u786e\u6570\u5b57\u8ba1\u7b97\u6216\u4fdd\u7559\u6307\u5b9a\u4f4d\u6570\u7684\u7cbe\u5ea6&#xff0c;\u9700\u8981\u4f7f\u7528BigDecimal\u7c7b\u3002<\/li>\n<li>\u968f\u4fbf\u5199\u4e00\u4e2a\u5c0f\u6570\u5b57\u9762\u91cf\u9ed8\u8ba4\u662fdouble\u7c7b\u578b\u3002<\/li>\n<li>\u8ba1\u7b97\u673a\u4e2d\u7684\u5b57\u7b26\u672c\u8d28\u4e0a\u662f\u4e00\u4e2a\u6574\u6570. \u5728 C \u8bed\u8a00\u4e2d\u4f7f\u7528 ASCII \u8868\u793a\u5b57\u7b26, \u800c Java \u4e2d\u4f7f\u7528 Unicode \u8868\u793a\u5b57\u7b26. \u56e0\u6b64\u4e00\u4e2a\u5b57\u7b26\u5360\u7528\u4e24\u4e2a\u5b57\u8282, \u8868\u793a\u7684\u5b57\u7b26\u79cd\u7c7b\u66f4\u591a, \u5305\u62ec\u4e2d\u6587\u3002 5.Java \u7684 boolean \u7c7b\u578b\u548c int \u4e0d\u80fd\u76f8\u4e92\u8f6c\u6362, \u4e0d\u5b58\u5728 1 \u8868\u793a true, 0 \u8868\u793a false \u8fd9\u6837\u7684\u7528\u6cd5\u3002 6.Java\u865a\u62df\u673a\u89c4\u8303\u4e2d&#xff0c;\u5e76\u6ca1\u6709\u660e\u786e\u89c4\u5b9aboolean\u5360\u51e0\u4e2a\u5b57\u8282&#xff0c;\u4e5f\u6ca1\u6709\u4e13\u95e8\u7528\u6765\u5904\u7406boolean\u7684\u5b57\u8282\u7801\u6307\u4ee4&#xff0c;\u5728Oracle\u516c\u53f8\u7684\u865a\u62df\u673a\u5b9e\u73b0\u4e2d&#xff0c;boolean\u53601\u4e2a\u5b57\u8282\u3002<\/li>\n<h4>\u4ec0\u4e48\u662f\u5b57\u8282?<\/h4>\n<p>\u8ba1\u7b97\u673a\u4e2d\u6700\u5c0f\u5b58\u50a8\u5355\u4f4d&#xff1a;bit&#xff08;\u6bcf\u4e2a0\u62161\u5c31\u662f\u4e00\u4e2a\u4f4d&#xff09;\u3002 \u8ba1\u7b97\u673a\u4e2d\u57fa\u672c\u5b58\u50a8\u5355\u5143&#xff1a;Byte&#xff08;B&#xff09;&#xff08;\u662f\u8ba1\u7b97\u673a\u7528\u4e8e\u8ba1\u7b97\u5b58\u50a8\u5bb9\u91cf\u7684\u57fa\u672c\u5355\u4f4d&#xff09; \u8f6c\u6362\u5173\u7cfb&#xff1a; 8 bit &#061; 1 Byte 1024 Byte &#061; 1KB 1024 KB &#061; 1MB 1024 MB &#061;1GB 1024 GB &#061; 1TB<\/p>\n<h4>\u53d8\u91cf<\/h4>\n<p>\u5b9a\u4e49&#xff1a;\u7ecf\u5e38\u6539\u53d8\u7684\u91cf\u5c31\u662f\u53d8\u91cf\u3002<\/p>\n<p>\u6570\u636e\u7c7b\u578b \u53d8\u91cf\u540d &#061; \u521d\u59cb\u503c;<\/p>\n<p>\u6ce8\u610f&#xff1a; \u547d\u540d\u4e00\u4e2a\u53d8\u91cf\u65f6\u5c3d\u91cf\u7ed9\u4e00\u4e2a\u521d\u59cb\u503c\u3002&#xff08;\u7a0b\u5e8f\u5728\u8c03\u7528\u65f6\u5982\u679c\u6ca1\u6709\u7ed9\u53d8\u91cf\u8d4b\u503c&#xff0c;\u7f16\u8bd1\u65f6\u4f1a\u62a5\u9519&#xff09;<\/p>\n<p>\u6ce8\u610f&#xff1a; 1.\u5728\u4e00\u884c\u53ef\u4ee5\u5b9a\u4e49\u591a\u4e2a\u76f8\u540c\u7c7b\u578b\u7684\u53d8\u91cf\u3002\u5982&#xff1a;int a1 &#061; 10, a2 &#061;20, a3 &#061; 30; 2. float a &#061; 2.8f;\u7c7b\u578b\u662ffloat\u503c\u7684\u540e\u9762\u52a0f\u3002\u56e0\u4e3a\u968f\u4fbf\u5199\u4e00\u4e2a\u5c0f\u6570\u90fd\u662fdouble\u7c7b\u578b\u3002 3. long &#061; 299L;\u7c7b\u578b\u662flong\u503c\u540e\u9762\u52a0L&#xff0c;\u5c0f\u5199\u4f1a\u8bef\u770b\u62101\u3002 4. \u8d4b\u503c\u65f6\u4e0d\u8981\u8d85\u8fc7\u7c7b\u578b\u7684\u8303\u56f4&#xff0c;\u5426\u5219\u4f1a\u62a5\u9519\u3002<\/p>\n<h4>\u7c7b\u578b\u8f6c\u6362<\/h4>\n<p>\u5728Java\u4e2d&#xff0c;\u5f53\u53c2\u4e0e\u8fd0\u7b97\u6570\u636e\u7c7b\u578b\u4e0d\u4e00\u81f4\u65f6&#xff0c;\u5c31\u4f1a\u8fdb\u884c\u7c7b\u578b\u8f6c\u6362\u3002Java\u4e2d\u7c7b\u578b\u8f6c\u6362\u4e3b\u8981\u5206\u4e3a\u4e24\u7c7b&#xff1a;\u81ea\u52a8\u7c7b\u578b\u8f6c\u6362(\u9690\u5f0f) \u548c \u5f3a\u5236\u7c7b\u578b\u8f6c\u6362(\u663e\u5f0f)\u3002<\/p>\n<p>&#xff08;1&#xff09;\u81ea\u52a8\u7c7b\u578b\u8f6c\u6362&#xff1a;\u4ee3\u7801\u4e0d\u9700\u8981\u7ecf\u8fc7\u4efb\u4f55\u5904\u7406&#xff0c;\u5728\u4ee3\u7801\u7f16\u8bd1\u65f6&#xff0c;\u7f16\u8bd1\u5668\u4f1a\u81ea\u52a8\u8fdb\u884c\u5904\u7406\u3002\u7279\u70b9 \u662f\u6570\u636e\u8303\u56f4\u5c0f\u7684\u8f6c\u4e3a\u6570\u636e\u8303\u56f4\u5927\u7684\u65f6\u4f1a\u81ea\u52a8\u8fdb\u884c\u3002<\/p>\n<p>\u5982&#xff1a;<\/p>\n<p><span class=\"token keyword\">int<\/span> a <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">2<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">long<\/span> b <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">100L<\/span><span class=\"token punctuation\">;<\/span><br \/>\nb <span class=\"token operator\">&#061;<\/span> a<span class=\"token punctuation\">;<\/span><span class=\"token comment\">\/\/a\u548cb\u90fd\u662f\u6574\u5f62&#xff0c;a\u7684\u8303\u56f4\u5c0f&#xff0c;b\u7684\u8303\u56f4\u5927&#xff0c;\u5f53\u5c06a\u8d4b\u503c\u7ed9b\u65f6&#xff0c;\u7f16\u8bd1\u5668\u4f1a\u81ea\u52a8\u5c06a\u63d0\u5347\u4e3along\u7c7b\u578b&#xff0c;\u7136\u540e\u8d4b\u503c<\/span><br \/>\na <span class=\"token operator\">&#061;<\/span> b<span class=\"token punctuation\">;<\/span><span class=\"token comment\">\/\/\u7f16\u8bd1\u62a5\u9519&#xff0c;long\u7684\u8303\u56f4\u6bd4int\u8303\u56f4\u5927&#xff0c;\u4f1a\u6709\u6570\u636e\u4e22\u5931&#xff0c;\u4e0d\u5b89\u5168<\/span><\/p>\n<p>byte b1 &#061; 100; \/\/ \u7f16\u8bd1\u901a\u8fc7&#xff0c;100\u6ca1\u6709\u8d85\u8fc7byte\u7684\u8303\u56f4&#xff0c;\u7f16\u8bd1\u5668\u9690\u5f0f\u5c06100\u8f6c\u6362\u4e3abyte<br \/>\nbyte b2 &#061; 257; \/\/ \u7f16\u8bd1\u5931\u8d25&#xff0c;257\u8d85\u8fc7\u4e86byte\u7684\u6570\u636e\u8303\u56f4&#xff0c;\u6709\u6570\u636e\u4e22\u5931<\/p>\n<p>&#xff08;2&#xff09;\u5f3a\u5236\u7c7b\u578b\u8f6c\u6362&#xff1a; \u5f53\u8fdb\u884c\u64cd\u4f5c\u65f6&#xff0c;\u4ee3\u7801\u9700\u8981\u7ecf\u8fc7\u4e00\u5b9a\u7684\u683c\u5f0f\u5904\u7406&#xff0c;\u4e0d\u80fd\u81ea\u52a8\u5b8c\u6210\u3002\u7279\u70b9&#xff1a; \u6570\u636e\u8303\u56f4\u5927\u7684\u5230\u6570\u636e\u8303\u56f4\u5c0f\u7684\u3002<\/p>\n<p><span class=\"token keyword\">int<\/span> a <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">10<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">long<\/span> b <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">100L<\/span><span class=\"token punctuation\">;<\/span><br \/>\nb <span class=\"token operator\">&#061;<\/span> a<span class=\"token punctuation\">;<\/span> <span class=\"token comment\">\/\/ int&#8211;&gt;long&#xff0c;\u6570\u636e\u8303\u56f4\u7531\u5c0f\u5230\u5927&#xff0c;\u9690\u5f0f\u8f6c\u6362<\/span><br \/>\na <span class=\"token operator\">&#061;<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token keyword\">int<\/span><span class=\"token punctuation\">)<\/span>b<span class=\"token punctuation\">;<\/span> <span class=\"token comment\">\/\/ long&#8211;&gt;int, \u6570\u636e\u8303\u56f4\u7531\u5927\u5230\u5c0f&#xff0c;\u9700\u8981\u5f3a\u8f6c&#xff0c;\u5426\u5219\u7f16\u8bd1\u5931\u8d25<\/span><br \/>\n<span class=\"token keyword\">float<\/span> f <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">3.14F<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">double<\/span> d <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">5.12<\/span><span class=\"token punctuation\">;<\/span><br \/>\nd <span class=\"token operator\">&#061;<\/span> f<span class=\"token punctuation\">;<\/span> <span class=\"token comment\">\/\/ float&#8211;&gt;double&#xff0c;\u6570\u636e\u8303\u56f4\u7531\u5c0f\u5230\u5927&#xff0c;\u9690\u5f0f\u8f6c\u6362<\/span><br \/>\nf <span class=\"token operator\">&#061;<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token keyword\">float<\/span><span class=\"token punctuation\">)<\/span>d<span class=\"token punctuation\">;<\/span> <span class=\"token comment\">\/\/ double&#8211;&gt;float, \u6570\u636e\u8303\u56f4\u7531\u5927\u5230\u5c0f&#xff0c;\u9700\u8981\u5f3a\u8f6c&#xff0c;\u5426\u5219\u7f16\u8bd1\u5931\u8d25<\/span><br \/>\na <span class=\"token operator\">&#061;<\/span> d<span class=\"token punctuation\">;<\/span> <span class=\"token comment\">\/\/ \u62a5\u9519&#xff0c;\u7c7b\u578b\u4e0d\u517c\u5bb9<\/span><br \/>\na <span class=\"token operator\">&#061;<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token keyword\">int<\/span><span class=\"token punctuation\">)<\/span>d<span class=\"token punctuation\">;<\/span> <span class=\"token comment\">\/\/ int\u6ca1\u6709double\u8868\u793a\u7684\u6570\u636e\u8303\u56f4\u5927&#xff0c;\u9700\u8981\u5f3a\u8f6c&#xff0c;\u5c0f\u6570\u70b9\u4e4b\u540e\u5168\u90e8\u4e22\u5f03<\/span><br \/>\n<span class=\"token keyword\">byte<\/span> b1 <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">100<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token comment\">\/\/ 100\u9ed8\u8ba4\u4e3aint&#xff0c;\u6ca1\u6709\u8d85\u8fc7byte\u8303\u56f4&#xff0c;\u9690\u5f0f\u8f6c\u6362<\/span><br \/>\n<span class=\"token keyword\">byte<\/span> b2 <span class=\"token operator\">&#061;<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token keyword\">byte<\/span><span class=\"token punctuation\">)<\/span><span class=\"token number\">257<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token comment\">\/\/ 257\u9ed8\u8ba4\u4e3aint&#xff0c;\u8d85\u8fc7byte\u8303\u56f4&#xff0c;\u9700\u8981\u663e\u793a\u8f6c\u6362&#xff0c;\u5426\u5219\u62a5\u9519<\/span><br \/>\n<span class=\"token keyword\">boolean<\/span> flag <span class=\"token operator\">&#061;<\/span> <span class=\"token boolean\">true<\/span><span class=\"token punctuation\">;<\/span><br \/>\na <span class=\"token operator\">&#061;<\/span> flag<span class=\"token punctuation\">;<\/span> <span class=\"token comment\">\/\/ \u7f16\u8bd1\u5931\u8d25&#xff1a;\u7c7b\u578b\u4e0d\u517c\u5bb9<\/span><br \/>\nflag <span class=\"token operator\">&#061;<\/span> a<span class=\"token punctuation\">;<\/span> <span class=\"token comment\">\/\/ \u7f16\u8bd1\u5931\u8d25&#xff1a;\u7c7b\u578b\u4e0d\u517c\u5bb9<\/span><\/p>\n<p>\u6ce8\u610f&#xff1a;<\/p>\n<li>\u4e0d\u540c\u6570\u5b57\u7c7b\u578b\u7684\u53d8\u91cf\u4e4b\u95f4\u8d4b\u503c, \u8868\u793a\u8303\u56f4\u66f4\u5c0f\u7684\u7c7b\u578b\u80fd\u9690\u5f0f\u8f6c\u6362\u6210\u8303\u56f4\u8f83\u5927\u7684\u7c7b\u578b\u3002<\/li>\n<li>\u5982\u679c\u9700\u8981\u628a\u8303\u56f4\u5927\u7684\u7c7b\u578b\u8d4b\u503c\u7ed9\u8303\u56f4\u5c0f\u7684, \u9700\u8981\u5f3a\u5236\u7c7b\u578b\u8f6c\u6362, \u4f46\u662f\u53ef\u80fd\u7cbe\u5ea6\u4e22\u5931\u3002<\/li>\n<li>\u5c06\u4e00\u4e2a\u5b57\u9762\u503c\u5e38\u91cf\u8fdb\u884c\u8d4b\u503c\u7684\u65f6\u5019, Java \u4f1a\u81ea\u52a8\u9488\u5bf9\u6570\u5b57\u8303\u56f4\u8fdb\u884c\u68c0\u67e5\u3002<\/li>\n<li>\u5f3a\u5236\u7c7b\u578b\u8f6c\u6362\u4e0d\u4e00\u5b9a\u80fd\u6210\u529f&#xff0c;\u4e0d\u76f8\u5e72\u7684\u7c7b\u578b\u4e0d\u80fd\u4e92\u76f8\u8f6c\u6362\u3002<\/li>\n<li>\u8303\u56f4\u5c0f\u7684\u53ef\u4ee5\u9690\u5f0f\u8f6c\u6362\u6210\u5927\u7684\u8303\u56f4&#xff0c;\u4f46\u8303\u56f4\u5927\u7684\u4e0d\u80fd\u76f4\u63a5\u8f6c\u6362\u6210\u5c0f\u7684&#xff0c;\u9700\u8981\u5f3a\u5236\u8f6c\u6362&#xff0c;\u5426\u5219\u62a5\u9519\u3002<\/li>\n<h4>\u7c7b\u578b\u63d0\u5347<\/h4>\n<p>\u5b9a\u4e49&#xff1a;\u4e0d\u540c\u7c7b\u578b\u7684\u6570\u636e\u4e4b\u95f4\u76f8\u4e92\u8fd0\u7b97\u65f6&#xff0c;\u6570\u636e\u7c7b\u578b\u5c0f\u7684\u4f1a\u88ab\u63d0\u5347\u5230\u6570\u636e\u7c7b\u578b\u5927\u7684\u3002<\/p>\n<li>int\u4e0elong\u4e4b\u95f4&#xff1a;int\u4f1a\u88ab\u63d0\u5347\u4e3along\u3002<\/li>\n<p><span class=\"token keyword\">int<\/span> a <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">10<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">long<\/span> b <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">20<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">int<\/span> c <span class=\"token operator\">&#061;<\/span> a <span class=\"token operator\">&#043;<\/span> b<span class=\"token punctuation\">;<\/span> <span class=\"token comment\">\/\/ \u7f16\u8bd1\u51fa\u9519&#xff0c;long \u8d4b\u503c\u7ed9int\u65f6\u4f1a\u4e22\u5931\u6570\u636e<\/span><br \/>\n<span class=\"token keyword\">long<\/span> d <span class=\"token operator\">&#061;<\/span> a <span class=\"token operator\">&#043;<\/span> b<span class=\"token punctuation\">;<\/span> <span class=\"token comment\">\/\/ \u7f16\u8bd1\u6210\u529f<\/span><\/p>\n<li>byte\u4e0ebyte\u7684\u8fd0\u7b97\u3002<\/li>\n<p><span class=\"token keyword\">byte<\/span> a <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">10<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">byte<\/span> b <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">20<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">byte<\/span> c <span class=\"token operator\">&#061;<\/span> a <span class=\"token operator\">&#043;<\/span> b<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>c<span class=\"token punctuation\">)<\/span><span class=\"token comment\">\/\/\u62a5\u9519<\/span><\/p>\n<p>\u62a5\u9519\u5982\u4e0b&#xff1a; <img decoding=\"async\" src=\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2026\/01\/20260126100506-69773c523a603.png\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\" \/> \u539f\u56e0&#xff1a; byte \u548c byte \u90fd\u662f\u76f8\u540c\u7c7b\u578b, \u4f46\u662f\u51fa\u73b0\u7f16\u8bd1\u62a5\u9519.\u3002\u7a0b\u5e8f\u8fd0\u884ca &#043; b \u4f1a\u5148\u5c06 a\u548c b \u90fd\u63d0\u5347\u6210 int, \u518d\u8fdb\u884c\u8ba1\u7b97, \u5f97\u5230\u7684\u7ed3\u679c\u4e5f\u662f int, \u6700\u540e\u5c06\u7ed3\u679c\u8d4b\u503c\u7ed9c\u3002int\u7c7b\u578b\u8d4b\u503c\u7ed9byte\u7c7b\u578b\u9700\u8981\u5f3a\u5236\u8f6c\u6362&#xff0c;\u6545\u62a5\u9519\u3002<\/p>\n<p>\u8865\u5145\u77e5\u8bc6&#xff1a; \u7531\u4e8e\u8ba1\u7b97\u673a\u7684 CPU \u901a\u5e38\u662f\u6309\u7167 4 \u4e2a\u5b57\u8282\u4e3a\u5355\u4f4d\u4ece\u5185\u5b58\u4e2d\u8bfb\u5199\u6570\u636e\u3002 \u4e3a\u4e86\u786c\u4ef6\u4e0a\u5b9e\u73b0\u65b9\u4fbf, \u8bf8\u5982 byte \u548c short\u8fd9\u79cd\u4f4e\u4e8e 4 \u4e2a\u5b57\u8282\u7684\u7c7b\u578b, \u4f1a\u5148\u63d0\u5347\u6210 int, \u518d\u53c2\u4e0e\u8ba1\u7b97\u3002<\/p>\n<p>\u4e0a\u9762\u6b63\u786e\u505a\u6cd5&#xff1a;<\/p>\n<p><span class=\"token keyword\">byte<\/span> a <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">10<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">byte<\/span> b <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">20<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">byte<\/span> c <span class=\"token operator\">&#061;<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token keyword\">byte<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">(<\/span>a <span class=\"token operator\">&#043;<\/span> b<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>c<span class=\"token punctuation\">)<\/span><\/p>\n<p>\u7ed3\u8bba&#xff1a;<\/p>\n<li>\u4e0d\u540c\u7c7b\u578b\u7684\u6570\u636e\u6df7\u5408\u8fd0\u7b97, \u8303\u56f4\u5c0f\u7684\u4f1a\u63d0\u5347\u6210\u8303\u56f4\u5927\u7684\u3002<\/li>\n<li>\u5bf9\u4e8e short, byte \u8fd9\u79cd\u6bd4 4 \u4e2a\u5b57\u8282\u5c0f\u7684\u7c7b\u578b, \u4f1a\u5148\u63d0\u5347\u6210 4 \u4e2a\u5b57\u8282\u7684 int , \u518d\u8fd0\u7b97\u3002<\/li>\n<h4>\u5b57\u7b26\u4e32\u7c7b\u578b<\/h4>\n<p>\u5728Java\u4e2d\u4f7f\u7528String\u7c7b\u5b9a\u4e49\u5b57\u7b26\u4e32\u3002<\/p>\n<p><span class=\"token class-name\">String<\/span> s1 <span class=\"token operator\">&#061;<\/span> <span class=\"token string\">&#034;Hello&#034;<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token class-name\">String<\/span> s2 <span class=\"token operator\">&#061;<\/span> <span class=\"token string\">&#034; World&#034;<\/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>s1<span class=\"token operator\">&#043;<\/span>s2<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><span class=\"token comment\">\/\/\u52a0\u53f7\u8868\u793a\u5b57\u7b26\u4e32\u62fc\u63a5<\/span><\/p>\n<p>\u5b57\u7b26\u4e32\u548c\u6574\u5f62\u6570\u5b57\u8f6c\u6362;<\/p>\n<li>int\u8f6cString<\/li>\n<p><span class=\"token keyword\">int<\/span> num <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">120<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token comment\">\/\/ \u65b9\u6cd51<\/span><br \/>\n<span class=\"token class-name\">String<\/span> str1 <span class=\"token operator\">&#061;<\/span> num <span class=\"token operator\">&#043;<\/span> <span class=\"token string\">&#034;&#034;<\/span><span class=\"token punctuation\">;<\/span><span class=\"token comment\">\/\/xxx&#043;\u4e00\u4e2a\u5b57\u7b26\u4e32\u7b49\u4e8e\u5b57\u7b26\u4e32<\/span><br \/>\n<span class=\"token comment\">\/\/ \u65b9\u6cd52<\/span><br \/>\n<span class=\"token class-name\">String<\/span> str2 <span class=\"token operator\">&#061;<\/span> <span class=\"token class-name\">String<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">valueOf<\/span><span class=\"token punctuation\">(<\/span>num<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<li>String\u8f6cint<\/li>\n<p><span class=\"token class-name\">String<\/span> s <span class=\"token operator\">&#061;<\/span> <span class=\"token string\">&#034;110&#034;<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">int<\/span> num <span class=\"token operator\">&#061;<\/span> <span class=\"token class-name\">Integer<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">parseInt<\/span><span class=\"token punctuation\">(<\/span>s<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u6587\u7ae0\u76ee\u5f55\u5b57\u9762\u5e38\u91cf\u6570\u636e\u7c7b\u578b\u4ec0\u4e48\u662f\u5b57\u8282?\u53d8\u91cf\u7c7b\u578b\u8f6c\u6362\u7c7b\u578b\u63d0\u5347\u5b57\u7b26\u4e32\u7c7b\u578b\u5b57\u9762\u5e38\u91cf<br \/>\n\u5b9a\u4e49&#xff1a;\u5e38\u91cf\u5373\u7a0b\u5e8f\u8fd0\u884c\u671f\u95f4&#xff0c;\u56fa\u5b9a\u4e0d\u53d8\u7684\u91cf\u79f0\u4e3a\u5e38\u91cf\u3002<br \/>\n\u5206\u7c7b&#xff1a;<br \/>\n\u5b57\u7b26\u4e32\u5e38\u91cf&#xff1a;\u7531\\&#8221;\\&#8221;\u62ec\u8d77\u6765\u7684&#xff0c;\u5982\u201c12345\u201d\u3001\u201chello\u201d\u3001\u201c\u4f60\u597d\u201d\u3002\u6574\u5f62\u5e38\u91cf&#xff1a;\u5982&#xff1a;100\u30011000\u6d6e\u70b9\u6570\u5e38\u91cf&#xff1a;\u5982&#xff1a;3.14\u30010.49\u5b57\u7b26\u5e38\u91cf&#xff1a;\u7531\u5355\u5f15\u53f7\u62ec\u8d77\u6765\u7684\u5f53\u4e2a\u5b57\u7b26&#xff0c;\u5982&amp;#xff1<\/p>\n","protected":false},"author":2,"featured_media":66340,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[99,190],"topic":[],"class_list":["post-66342","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-server","tag-java","tag-190"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v20.3 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>\u3010Java\u6570\u636e\u7c7b\u578b\u3011 - 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content=\"\u4f5c\u8005\" \/>\n\t<meta name=\"twitter:data1\" content=\"admin\" \/>\n\t<meta name=\"twitter:label2\" content=\"\u9884\u8ba1\u9605\u8bfb\u65f6\u95f4\" \/>\n\t<meta name=\"twitter:data2\" content=\"2 \u5206\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"WebPage\",\"@id\":\"https:\/\/www.wsisp.com\/helps\/66342.html\",\"url\":\"https:\/\/www.wsisp.com\/helps\/66342.html\",\"name\":\"\u3010Java\u6570\u636e\u7c7b\u578b\u3011 - 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