\u4e0e\u8fdb\u7a0b\u7684\u5173\u7cfb<\/h5>\n\n- \u8fdb\u7a0b\u662f\u8d44\u6e90\u5206\u914d\u7684\u57fa\u672c\u5355\u4f4d，\u7ebf\u7a0b\u662f\u8c03\u5ea6\u6267\u884c\u7684\u57fa\u672c\u5355\u4f4d\u3002<\/li>\n
- \u4e00\u4e2a\u8fdb\u7a0b\u81f3\u5c11\u5305\u542b\u4e00\u4e2a\u7ebf\u7a0b（\u79f0\u4e3a\u4e3b\u7ebf\u7a0b），\u4e5f\u53ef\u521b\u5efa\u591a\u4e2a\u7ebf\u7a0b（\u79f0\u4e3a\u5b50\u7ebf\u7a0b）\u3002<\/li>\n
- \u8fdb\u7a0b\u95f4\u8d44\u6e90\u76f8\u4e92\u72ec\u7acb，\u7ebf\u7a0b\u95f4\u8d44\u6e90\u5171\u4eab（\u56e0\u6b64\u9700\u6ce8\u610f\u7ebf\u7a0b\u5b89\u5168\u95ee\u9898，\u5982\u7ade\u6001\u6761\u4ef6）\u3002<\/li>\n<\/ul>\n
\u4e3e\u4f8b\u8bf4\u660e<\/h5>\n\n- \u6253\u5f00\u4e00\u4e2a\u6d4f\u89c8\u5668（\u8fdb\u7a0b），\u5176\u4e2d \u201c\u7f51\u9875\u6e32\u67d3\u201d\u201c\u4e0b\u8f7d\u6587\u4ef6\u201d\u201c\u64ad\u653e\u97f3\u9891\u201d \u7b49\u529f\u80fd\u53ef\u7531\u4e0d\u540c\u7ebf\u7a0b\u540c\u65f6\u6267\u884c，\u5b83\u4eec\u5171\u4eab\u6d4f\u89c8\u5668\u7684\u5185\u5b58\u548c\u7f51\u7edc\u8fde\u63a5\u3002<\/li>\n<\/ul>\n
\u4e8c. \u521b\u5efa\u7ebf\u7a0b\u7684\u56db\u79cd\u65b9\u5f0f<\/h3>\n1. \u7ee7\u627fThread\u7c7b\u5e76\u91cd\u5199run()\u65b9\u6cd5<\/h4>\n
\u6b65\u9aa4：<\/p>\n<\/p>\n
\n- \u5b9a\u4e49\u7c7b\u7ee7\u627fjava.lang.Thread\u7c7b<\/li>\n
- \u91cd\u5199run()\u65b9\u6cd5（\u7ebf\u7a0b\u6267\u884c\u7684\u6838\u5fc3\u903b\u8f91）<\/li>\n
- \u521b\u5efa\u7ebf\u7a0b\u5bf9\u8c61\u5e76\u8c03\u7528start()\u65b9\u6cd5\u542f\u52a8\u7ebf\u7a0b（\u800c\u975e\u76f4\u63a5\u8c03\u7528run()）<\/li>\n<\/ul>\n
\u793a\u4f8b\u4ee3\u7801：<\/p>\n
package com.itheima.ReStudy2;<\/p>\n
public class Demo1 {
\n public static void main(String[] args) {
\n Thread t = new MyThread();
\n t.start();
\n }
\n}
\nclass MyThread extends Thread{
\n @Override
\n public void run() {
\n System.out.println("\u606d\u559c\u4f60，\u521b\u5efa\u7ebf\u7a0b\u6210\u529f");
\n }
\n}<\/p>\n
\u7279\u70b9：<\/p>\n<\/p>\n
\n- \u5b9e\u73b0\u7b80\u5355，\u4f46\u53d7\u9650\u4e8e Java \u5355\u7ee7\u627f\u7279\u6027，\u7075\u6d3b\u6027\u8f83\u4f4e\u3002<\/li>\n<\/ul>\n
2. \u5b9e\u73b0Runnable\u63a5\u53e3<\/h4>\n
\u6b65\u9aa4：<\/p>\n<\/p>\n
\n- \u5b9a\u4e49\u7c7b\u5b9e\u73b0java.lang.Runnable\u63a5\u53e3<\/li>\n
- \u5b9e\u73b0run()\u65b9\u6cd5（\u7ebf\u7a0b\u6267\u884c\u903b\u8f91）<\/li>\n
- \u521b\u5efaThread\u5bf9\u8c61，\u5c06Runnable\u5b9e\u4f8b\u4f5c\u4e3a\u53c2\u6570\u4f20\u5165<\/li>\n
- \u8c03\u7528Thread\u5bf9\u8c61\u7684start()\u65b9\u6cd5\u542f\u52a8\u7ebf\u7a0b<\/li>\n<\/ul>\n
\u793a\u4f8b\u4ee3\u7801：<\/p>\n
package com.itheima.ReStudy2;<\/p>\n
public class Demo2 {
\n public static void main(String[] args) {<\/p>\n
Thread t = new Thread(new MyThread2());
\n t.start();
\n }
\n}
\nclass MyThread2 implements Runnable{
\n @Override
\n public void run() {
\n System.out.println("\u606d\u559c\u4f60，\u901a\u8fc7Runnable\u63a5\u53e3\u6210\u529f\u5b9e\u73b0\u4e86\u4e00\u4e2a\u7ebf\u7a0b");
\n }
\n}<\/p>\n
\u7279\u70b9：<\/p>\n<\/p>\n
\n- \u907f\u514d\u5355\u7ee7\u627f\u9650\u5236，\u53ef\u540c\u65f6\u5b9e\u73b0\u5176\u4ed6\u63a5\u53e3，\u63a8\u8350\u4f18\u5148\u4f7f\u7528\u3002<\/li>\n<\/ul>\n
3. \u5b9e\u73b0Callable\u63a5\u53e3（\u5e26\u8fd4\u56de\u503c\u7684\u7ebf\u7a0b）<\/h4>\n
\u6b65\u9aa4：<\/p>\n<\/p>\n
\n- \u5b9a\u4e49\u7c7b\u5b9e\u73b0java.util.concurrent.Callable<V>\u63a5\u53e3（V\u4e3a\u8fd4\u56de\u503c\u7c7b\u578b）<\/li>\n
- \u5b9e\u73b0call()\u65b9\u6cd5（\u7ebf\u7a0b\u903b\u8f91，\u53ef\u8fd4\u56de\u7ed3\u679c\u5e76\u629b\u51fa\u5f02\u5e38）<\/li>\n
- \u521b\u5efaFutureTask<V>\u5bf9\u8c61\u5305\u88c5Callable\u5b9e\u4f8b（\u7528\u4e8e\u83b7\u53d6\u8fd4\u56de\u503c）<\/li>\n
- \u521b\u5efaThread\u5bf9\u8c61\u4f20\u5165FutureTask，\u8c03\u7528start()\u542f\u52a8<\/li>\n
- \u901a\u8fc7FutureTask\u7684get()\u65b9\u6cd5\u83b7\u53d6\u7ebf\u7a0b\u6267\u884c\u7ed3\u679c<\/li>\n<\/ul>\n
\u793a\u4f8b\u4ee3\u7801：<\/p>\n
package com.itheima.ReStudy2;<\/p>\n
import java.util.Objects;
\nimport java.util.concurrent.Callable;
\nimport java.util.concurrent.ExecutionException;
\nimport java.util.concurrent.FutureTask;<\/p>\n
public class DEmo3Callable {
\n public static void main(String[] args) throws ExecutionException, InterruptedException {
\n FutureTask f = new FutureTask<Object>(new MyThread3());
\n Thread t = new Thread(f);
\n t.start();
\n String a = (String) f.get();
\n\/\/ \u9700\u8981\u901a\u8fc7FutureTask\u83b7\u53d6Callable\u7684\u8fd4\u56de\u503c
\n System.out.println(a);
\n }
\n}
\nclass MyThread3 implements Callable<Object>{
\n @Override
\n public Object call() throws Exception {
\n String a = "\u6267\u884cCallable\u6210\u529f \u8fd4\u56de\u4e86\u4e00\u4e2aString\u5b57\u7b26\u4e32！";
\n return a;
\n }
\n}<\/p>\n
\u7279\u70b9：<\/p>\n<\/p>\n
\n- \u652f\u6301\u8fd4\u56de\u6267\u884c\u7ed3\u679c，\u53ef\u629b\u51fa\u5f02\u5e38，\u9002\u7528\u4e8e\u9700\u8981\u7ebf\u7a0b\u6267\u884c\u7ed3\u679c\u7684\u573a\u666f（\u5982\u5e76\u884c\u8ba1\u7b97）\u3002<\/li>\n<\/ul>\n
\u6838\u5fc3\u533a\u522b\u603b\u7ed3<\/p>\n
\n\u65b9\u5f0f\u5b9e\u73b0\u590d\u6742\u5ea6\u662f\u5426\u6709\u8fd4\u56de\u503c\u7075\u6d3b\u6027\u9002\u7528\u573a\u666f<\/tr>\n \n\n\u7ee7\u627fThread<\/td>\n \u7b80\u5355<\/td>\n \u65e0<\/td>\n \u4f4e（\u5355\u7ee7\u627f）<\/td>\n \u7b80\u5355\u7ebf\u7a0b\u4efb\u52a1<\/td>\n<\/tr>\n \n\u5b9e\u73b0Runnable<\/td>\n \u4e2d\u7b49<\/td>\n \u65e0<\/td>\n \u9ad8<\/td>\n \u591a\u7ebf\u7a0b\u5171\u4eab\u8d44\u6e90\u6216\u9700\u591a\u5b9e\u73b0<\/td>\n<\/tr>\n \n\u5b9e\u73b0Callable<\/td>\n \u8f83\u9ad8<\/td>\n \u6709<\/td>\n \u9ad8<\/td>\n \u9700\u8981\u7ebf\u7a0b\u6267\u884c\u7ed3\u679c\u6216\u5f02\u5e38\u5904\u7406<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n\u5b9e\u9645\u5f00\u53d1\u4e2d，Runnable\u548cCallable\u56e0\u7075\u6d3b\u6027\u66f4\u5e38\u7528，\u5c24\u5176\u662f\u914d\u5408\u7ebf\u7a0b\u6c60\u4f7f\u7528\u65f6\u3002<\/p>\n
4.\u7ebf\u7a0b\u6c60<\/h4>\n
\u5728 Java \u4e2d，\u7ebf\u7a0b\u6c60\u662f\u7ba1\u7406\u7ebf\u7a0b\u751f\u547d\u5468\u671f\u7684\u91cd\u8981\u673a\u5236，\u80fd\u591f\u6709\u6548\u907f\u514d\u9891\u7e41\u521b\u5efa \/ \u9500\u6bc1\u7ebf\u7a0b\u7684\u6027\u80fd\u5f00\u9500\u3002\u4f60\u63d0\u5230\u7684\u5e94\u8be5\u662fThreadPoolExecutor（\u6838\u5fc3\u5b9e\u73b0\u7c7b）\u548cExecutors（\u5de5\u5177\u7c7b），\u4e0b\u9762\u8be6\u7ec6\u4ecb\u7ecd：<\/p>\n
4.1 \u6838\u5fc3\u5b9e\u73b0\u7c7b：ThreadPoolExecutor<\/h5>\n
ThreadPoolExecutor\u662f\u7ebf\u7a0b\u6c60\u7684\u6838\u5fc3\u5b9e\u73b0\u7c7b，\u4f4d\u4e8ejava.util.concurrent\u5305\u4e0b，\u901a\u8fc7\u7075\u6d3b\u914d\u7f6e\u53c2\u6570\u53ef\u6ee1\u8db3\u4e0d\u540c\u573a\u666f\u9700\u6c42\u3002<\/p>\n
\u6838\u5fc3\u6784\u9020\u53c2\u6570<\/h5>\n
public ThreadPoolExecutor(
\n int corePoolSize, \/\/ \u6838\u5fc3\u7ebf\u7a0b\u6570（\u59cb\u7ec8\u5b58\u6d3b\u7684\u7ebf\u7a0b\u6570）
\n int maximumPoolSize, \/\/ \u6700\u5927\u7ebf\u7a0b\u6570（\u7ebf\u7a0b\u6c60\u5141\u8bb8\u7684\u6700\u5927\u7ebf\u7a0b\u6570）
\n long keepAliveTime, \/\/ \u975e\u6838\u5fc3\u7ebf\u7a0b\u7a7a\u95f2\u8d85\u65f6\u65f6\u95f4
\n TimeUnit unit, \/\/ \u8d85\u65f6\u65f6\u95f4\u5355\u4f4d（\u5982TimeUnit.SECONDS）
\n BlockingQueue<Runnable> workQueue, \/\/ \u4efb\u52a1\u7b49\u5f85\u961f\u5217（\u5b58\u653e\u672a\u6267\u884c\u7684\u4efb\u52a1）
\n ThreadFactory threadFactory, \/\/ \u7ebf\u7a0b\u5de5\u5382（\u7528\u4e8e\u521b\u5efa\u7ebf\u7a0b）
\n RejectedExecutionHandler handler \/\/ \u62d2\u7edd\u7b56\u7565（\u4efb\u52a1\u6ee1\u65f6\u7684\u5904\u7406\u65b9\u5f0f）
\n)<\/p>\n
\u5e38\u7528\u62d2\u7edd\u7b56\u7565<\/h5>\n
- AbortPolicy（\u9ed8\u8ba4）：\u76f4\u63a5\u629b\u51faRejectedExecutionException\u5f02\u5e38<\/li>\n
- CallerRunsPolicy：\u8ba9\u63d0\u4ea4\u4efb\u52a1\u7684\u7ebf\u7a0b\u81ea\u5df1\u6267\u884c\u4efb\u52a1<\/li>\n
- DiscardPolicy：\u76f4\u63a5\u4e22\u5f03\u4efb\u52a1（\u4e0d\u629b\u5f02\u5e38）<\/li>\n
- DiscardOldestPolicy：\u4e22\u5f03\u961f\u5217\u4e2d\u6700\u65e7\u7684\u4efb\u52a1，\u518d\u5c1d\u8bd5\u63d0\u4ea4\u65b0\u4efb\u52a1<\/li>\n
\u793a\u4f8b\u4ee3\u7801：<\/h5>\n
package com.itheima.ReStudy2;<\/p>\n
import java.util.concurrent.ArrayBlockingQueue;
\nimport java.util.concurrent.Executors;
\nimport java.util.concurrent.ThreadPoolExecutor;
\nimport java.util.concurrent.TimeUnit;<\/p>\n
public class Demo4ThreadPoolExecutor {
\n public static void main(String[] args) {
\n ThreadPoolExecutor executor = new ThreadPoolExecutor(
\n 3,\/\/\u6838\u5fc3\u7ebf\u7a0b\u6570
\n 5, \/\/\u6700\u5927\u7ebf\u7a0b\u6570
\n 10,\/\/\u7ebf\u7a0b\u7a7a\u95f2\u65f6\u95f4
\n TimeUnit.SECONDS,\/\/\u9500\u6bc1\u65f6\u95f4\u5355\u4f4d
\n new ArrayBlockingQueue<>(4),\/\/\u4efb\u52a1\u961f\u5217
\n Executors.defaultThreadFactory(),\/\/\u7ebf\u7a0b\u5de5\u5382
\n new ThreadPoolExecutor.AbortPolicy()\/\/\u62d2\u7edd\u7b56\u7565
\n );
\n for (int i = 0; i < 15; i++) {
\n executor.execute(new MyThread4());
\n System.out.println("\u5f53\u524d\u7ebf\u7a0b\u6570："+executor.getPoolSize());
\n System.out.println("\u5f53\u524d\u6392\u961f\u7ebf\u7a0b\u6570："+executor.getQueue().size());
\n try {
\n Thread.sleep(1000);
\n } catch (InterruptedException e) {
\n e.printStackTrace();
\n }
\n }
\n executor.shutdown();
\n }
\n}
\nclass MyThread4 implements Runnable{
\n public void run()
\n {
\n System.out.println(Thread.currentThread().getName()+"\u6267\u884c\u4e86");
\n }
\n}<\/p>\n
4.2 \u5de5\u5177\u7c7b：Executors<\/h5>\n
Executors\u63d0\u4f9b\u4e86\u4fbf\u6377\u7684\u9759\u6001\u65b9\u6cd5，\u53ef\u5feb\u901f\u521b\u5efa\u9884\u914d\u7f6e\u7684\u7ebf\u7a0b\u6c60（\u5e95\u5c42\u4ecd\u57fa\u4e8eThreadPoolExecutor），\u9002\u5408\u7b80\u5355\u573a\u666f\u3002\u4f46\u963f\u91cc\u5df4\u5df4\u5f00\u53d1\u624b\u518c\u4e0d\u63a8\u8350\u4f7f\u7528，\u56e0\u9ed8\u8ba4\u53c2\u6570\u53ef\u80fd\u5bfc\u81f4\u8d44\u6e90\u8017\u5c3d（\u5982\u65e0\u754c\u961f\u5217）\u3002<\/p>\n
\u5e38\u7528\u65b9\u6cd5<\/h5>\n
- \n
Executors.newFixedThreadPool(int nThreads)<\/p>\n
\n- \u56fa\u5b9a\u5927\u5c0f\u7684\u7ebf\u7a0b\u6c60（\u6838\u5fc3\u7ebf\u7a0b\u6570 = \u6700\u5927\u7ebf\u7a0b\u6570）<\/li>\n
- \u961f\u5217\u4f7f\u7528LinkedBlockingQueue（\u65e0\u754c，\u53ef\u80fd\u5806\u79ef\u5927\u91cf\u4efb\u52a1\u5bfc\u81f4 OOM<\/li>\n<\/ul>\n<\/li>\n
ExecutorService fixedPool = Executors.newFixedThreadPool(5); \/\/ \u56fa\u5b9a5\u4e2a\u7ebf\u7a0b<\/p>\n
Executors.newCachedThreadPool()<\/p>\n
\n- \u53ef\u7f13\u5b58\u7684\u7ebf\u7a0b\u6c60（\u6838\u5fc3\u7ebf\u7a0b\u6570 = 0，\u6700\u5927\u7ebf\u7a0b\u6570 = Integer.MAX_VALUE）<\/li>\n
- \u7a7a\u95f2\u7ebf\u7a0b 60 \u79d2\u540e\u9500\u6bc1，\u9002\u5408\u77ed\u671f\u4efb\u52a1<\/li>\n
- \u98ce\u9669：\u4efb\u52a1\u8fc7\u591a\u65f6\u53ef\u80fd\u521b\u5efa\u5927\u91cf\u7ebf\u7a0b\u5bfc\u81f4 OOM<\/li>\n<\/ul>\n
ExecutorService cachedPool = Executors.newCachedThreadPool();<\/p>\n
Executors.newSingleThreadExecutor()<\/p>\n
\n- \u5355\u7ebf\u7a0b\u6c60（\u6838\u5fc3\u7ebf\u7a0b\u6570 = \u6700\u5927\u7ebf\u7a0b\u6570 = 1）<\/li>\n
- \u6240\u6709\u4efb\u52a1\u6309\u987a\u5e8f\u6267\u884c，\u9002\u5408\u9700\u8981\u4e32\u884c\u6267\u884c\u7684\u573a\u666f<\/li>\n<\/ul>\n
ExecutorService singlePool = Executors.newSingleThreadExecutor();<\/p>\n
Executors.newScheduledThreadPool(int corePoolSize)<\/p>\n
\n- \u5b9a\u65f6\u4efb\u52a1\u7ebf\u7a0b\u6c60，\u652f\u6301\u5ef6\u8fdf\u6267\u884c\u6216\u5468\u671f\u6027\u6267\u884c<\/li>\n<\/ul>\n
ScheduledExecutorService scheduledPool = Executors.newScheduledThreadPool(3);
\n\/\/ \u5ef6\u8fdf1\u79d2\u540e\u6267\u884c
\nscheduledPool.schedule(() -> System.out.println("\u5ef6\u8fdf\u6267\u884c"), 1, TimeUnit.SECONDS);
\n\/\/ \u5ef6\u8fdf2\u79d2\u540e，\u6bcf3\u79d2\u6267\u884c\u4e00\u6b21
\nscheduledPool.scheduleAtFixedRate(() -> System.out.println("\u5468\u671f\u6267\u884c"), 2, 3, TimeUnit.SECONDS);<\/p>\n
4.3 \u7ebf\u7a0b\u6c60\u4f7f\u7528\u6d41\u7a0b<\/h5>\n
- \u521b\u5efa\u7ebf\u7a0b\u6c60（\u63a8\u8350ThreadPoolExecutor\u624b\u52a8\u914d\u7f6e\u53c2\u6570）<\/li>\n
- \u901a\u8fc7submit()\u6216execute()\u63d0\u4ea4\u4efb\u52a1（submit()\u53ef\u8fd4\u56deFuture\u83b7\u53d6\u7ed3\u679c）<\/li>\n
- \u4efb\u52a1\u6267\u884c\u5b8c\u6bd5\u540e，\u8c03\u7528shutdown()（\u5e73\u7f13\u5173\u95ed）\u6216shutdownNow()（\u5f3a\u5236\u5173\u95ed）<\/li>\n
4.4 \u6838\u5fc3\u533a\u522b\u4e0e\u5efa\u8bae<\/h5>\n
\n\u7c7b\u578b\u4f18\u52bf\u52a3\u52bf\u5efa\u8bae\u573a\u666f<\/tr>\n \n\nThreadPoolExecutor<\/td>\n \u53c2\u6570\u53ef\u63a7，\u7075\u6d3b\u9002\u914d\u573a\u666f<\/td>\n \u914d\u7f6e\u590d\u6742<\/td>\n \u751f\u4ea7\u73af\u5883，\u9700\u7cbe\u7ec6\u63a7\u5236\u8d44\u6e90<\/td>\n<\/tr>\n \nExecutors\u5de5\u5177\u7c7b<\/td>\n \u5feb\u901f\u521b\u5efa，\u4ee3\u7801\u7b80\u6d01<\/td>\n \u9ed8\u8ba4\u53c2\u6570\u6709\u6f5c\u5728\u98ce\u9669（\u5982 OOM）<\/td>\n \u7b80\u5355\u573a\u666f\u6216\u6d4b\u8bd5\u73af\u5883<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n\u6700\u4f73\u5b9e\u8df5：\u751f\u4ea7\u73af\u5883\u4e2d\u63a8\u8350\u76f4\u63a5\u4f7f\u7528ThreadPoolExecutor，\u6839\u636e\u4e1a\u52a1\u9700\u6c42\u5408\u7406\u8bbe\u7f6e\u6838\u5fc3\u7ebf\u7a0b\u6570\u3001\u961f\u5217\u5927\u5c0f\u548c\u62d2\u7edd\u7b56\u7565，\u907f\u514d\u8d44\u6e90\u8017\u5c3d\u98ce\u9669\u3002<\/p>\n
\u4e09. \u591a\u7ebf\u7a0b\u5e76\u53d1\u5b89\u5168\u89e3\u51b3<\/h3>\n
\u5728\u591a\u7ebf\u7a0b\u73af\u5883\u4e2d，\u5f53\u591a\u4e2a\u7ebf\u7a0b\u540c\u65f6\u64cd\u4f5c\u5171\u4eab\u8d44\u6e90\u65f6，\u53ef\u80fd\u4f1a\u5bfc\u81f4\u6570\u636e\u4e0d\u4e00\u81f4\u3001\u903b\u8f91\u9519\u8bef\u7b49\u95ee\u9898，\u8fd9\u5c31\u662f\u5e76\u53d1\u5b89\u5168\u95ee\u9898\u3002<\/p>\n
1. \u5e76\u53d1\u5b89\u5168\u95ee\u9898\u7684\u4ea7\u751f\u6761\u4ef6<\/h5>\n
- \u591a\u7ebf\u7a0b\u73af\u5883：\u5b58\u5728\u591a\u4e2a\u7ebf\u7a0b\u540c\u65f6\u6267\u884c<\/li>\n
- \u5171\u4eab\u8d44\u6e90：\u7ebf\u7a0b\u64cd\u4f5c\u540c\u4e00\u4efd\u53ef\u4fee\u6539\u7684\u8d44\u6e90（\u5982\u5168\u5c40\u53d8\u91cf\u3001\u9759\u6001\u53d8\u91cf\u3001\u5bf9\u8c61\u5c5e\u6027\u7b49）<\/li>\n
- \u975e\u539f\u5b50\u64cd\u4f5c：\u5bf9\u5171\u4eab\u8d44\u6e90\u7684\u64cd\u4f5c\u4e0d\u662f\u4e00\u6b65\u5b8c\u6210\u7684（\u5982i++\u5b9e\u9645\u5305\u542b\u8bfb\u53d6\u3001\u4fee\u6539\u3001\u5199\u5165\u4e09\u6b65）<\/li>\n
\u793a\u4f8b：\u4e0d\u5b89\u5168\u7684\u591a\u7ebf\u7a0b\u64cd\u4f5c<\/p>\n
public class UnsafeThreadDemo {
\n private static int count = 0; \/\/ \u5171\u4eab\u8d44\u6e90<\/p>\n
public static void main(String[] args) throws InterruptedException {
\n \/\/ \u521b\u5efa1000\u4e2a\u7ebf\u7a0b，\u6bcf\u4e2a\u7ebf\u7a0b\u5bf9count\u52a0100\u6b21
\n Runnable task = () -> {
\n for (int i = 0; i < 100; i++) {
\n count++; \/\/ \u975e\u539f\u5b50\u64cd\u4f5c，\u5b58\u5728\u5b89\u5168\u95ee\u9898
\n }
\n };<\/p>\n
Thread[] threads = new Thread[1000];
\n for (int i = 0; i < 1000; i++) {
\n threads[i] = new Thread(task);
\n threads[i].start();
\n }<\/p>\n
\/\/ \u7b49\u5f85\u6240\u6709\u7ebf\u7a0b\u6267\u884c\u5b8c\u6bd5
\n for (int i = 0; i < 1000; i++) {
\n threads[i].join();
\n }<\/p>\n
System.out.println("\u6700\u7ec8\u7ed3\u679c：" + count); \/\/ \u9884\u671f100000，\u5b9e\u9645\u5f80\u5f80\u5c0f\u4e8e\u8be5\u503c
\n }
\n}<\/p>\n
![\"\"](\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2025\/08\/20250811131421-6899ecadb2d4a.png\")
<\/p>\n
\u95ee\u9898\u539f\u56e0：\u591a\u4e2a\u7ebf\u7a0b\u540c\u65f6\u8bfb\u53d6count\u7684\u503c，\u4fee\u6539\u540e\u518d\u5199\u56de（\u7531\u4e8e\u7ebf\u7a0b\u6267\u884c\u5e76\u53d1\u673a\u5236），\u5bfc\u81f4\u90e8\u5206\u589e\u91cf\u64cd\u4f5c\u88ab\u8986\u76d6\u3002<\/p>\n
\u4e8c\u3001\u5e76\u53d1\u5b89\u5168\u95ee\u9898\u7684\u89e3\u51b3\u65b9\u6848<\/h5>\n1. \u540c\u6b65\u9501（synchronized\u4ee3\u7801\u5757）<\/h6>\n
\u901a\u8fc7\u00a0synchronized\u5173\u952e\u5b57\u9501\u5b9a\u5171\u4eab\u8d44\u6e90，\u786e\u4fdd\u540c\u4e00\u65f6\u95f4\u53ea\u6709\u4e00\u4e2a\u7ebf\u7a0b\u80fd\u6267\u884c\u4e34\u754c\u533a\u4ee3\u7801\u3002<\/p>\n<\/p>\n
\u8bed\u6cd5：<\/p>\n
synchronized (\u9501\u5bf9\u8c61) { \/\/ \u64cd\u4f5c\u5171\u4eab\u8d44\u6e90\u7684\u4ee3\u7801（\u4e34\u754c\u533a） }<\/p>\n
\u793a\u4f8b：<\/p>\n
public class SynchronizedBlockDemo {
\n private static int count = 0;
\n private static final Object lock = new Object(); \/\/ \u9501\u5bf9\u8c61（\u63a8\u8350\u4f7f\u7528\u4e13\u7528\u5bf9\u8c61）<\/p>\n
public static void main(String[] args) throws InterruptedException {
\n Runnable task = () -> {
\n for (int i = 0; i < 100; i++) {
\n synchronized (lock) { \/\/ \u9501\u5b9a\u4e34\u754c\u533a
\n count++;
\n }
\n }
\n };<\/p>\n
\/\/ \u542f\u52a8\u7ebf\u7a0b\u903b\u8f91\u540c\u4e0a…
\n Thread[] threads = new Thread[1000];
\n for (int i = 0; i < 1000; i++) {
\n threads[i] = new Thread(task);
\n threads[i].start();
\n }<\/p>\n
for (int i = 0; i < 1000; i++) {
\n threads[i].join();
\n }<\/p>\n
System.out.println("\u6700\u7ec8\u7ed3\u679c：" + count); \/\/ \u6b63\u786e\u8f93\u51fa100000
\n }
\n}<\/p>\n
\u7279\u70b9：<\/p>\n<\/p>\n
\n- \u9501\u5bf9\u8c61\u53ef\u4ee5\u662f\u4efb\u610f\u5bf9\u8c61，\u4f46\u591a\u4e2a\u7ebf\u7a0b\u5fc5\u987b\u4f7f\u7528\u540c\u4e00\u4e2a\u9501\u5bf9\u8c61\u624d\u80fd\u4fdd\u8bc1\u540c\u6b65<\/li>\n
- \u63a8\u8350\u4f7f\u7528private static final Object\u4f5c\u4e3a\u9501\u5bf9\u8c61，\u907f\u514d\u9501\u5bf9\u8c61\u88ab\u4fee\u6539<\/li>\n<\/ul>\n
2. \u540c\u6b65\u65b9\u6cd5（synchronized\u65b9\u6cd5）<\/h6>\n
\u5c06\u00a0synchronized\u5173\u952e\u5b57\u4fee\u9970\u5728\u65b9\u6cd5\u4e0a，\u6b64\u65f6\u9501\u5bf9\u8c61\u4e3a：<\/p>\n<\/p>\n
\n- \u975e\u9759\u6001\u65b9\u6cd5：\u5f53\u524d\u5bf9\u8c61（this）<\/li>\n
- \u9759\u6001\u65b9\u6cd5：\u5f53\u524d\u7c7b\u7684Class\u5bf9\u8c61<\/li>\n<\/ul>\n
\u793a\u4f8b：<\/p>\n
public class SynchronizedMethodDemo {
\n private static int count = 0;<\/p>\n
\/\/ \u9759\u6001\u540c\u6b65\u65b9\u6cd5（\u9501\u5bf9\u8c61\u4e3aSynchronizedMethodDemo.class）
\n private static synchronized void increment() {
\n count++;
\n }<\/p>\n
public static void main(String[] args) throws InterruptedException {
\n Runnable task = () -> {
\n for (int i = 0; i < 100; i++) {
\n increment(); \/\/ \u8c03\u7528\u540c\u6b65\u65b9\u6cd5
\n }
\n };<\/p>\n
\/\/ \u542f\u52a8\u7ebf\u7a0b\u903b\u8f91\u540c\u4e0a…
\n Thread[] threads = new Thread[1000];
\n for (int i = 0; i < 1000; i++) {
\n threads[i] = new Thread(task);
\n threads[i].start();
\n }<\/p>\n
for (int i = 0; i < 1000; i++) {
\n threads[i].join();
\n }<\/p>\n
System.out.println("\u6700\u7ec8\u7ed3\u679c：" + count); \/\/ \u6b63\u786e\u8f93\u51fa100000
\n }
\n}<\/p>\n
![\"\"](\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2025\/08\/20250811131421-6899ecadbf5d4.png\")
<\/p>\n
Lock\u76f8\u6bd4synchronized\u7684\u4f18\u52bf：<\/p>\n<\/p>\n
\n- \u53ef\u4e2d\u65ad\u9501：\u652f\u6301tryLock(long time, TimeUnit unit)\u8d85\u65f6\u83b7\u53d6\u9501，\u907f\u514d\u6b7b\u9501<\/li>\n
- \u53ef\u5c1d\u8bd5\u83b7\u53d6\u9501：tryLock()\u65b9\u6cd5\u5c1d\u8bd5\u83b7\u53d6\u9501，\u5931\u8d25\u5219\u7acb\u5373\u8fd4\u56de<\/li>\n
- \u516c\u5e73\u9501：ReentrantLock\u53ef\u901a\u8fc7\u6784\u9020\u53c2\u6570new ReentrantLock(true)\u5b9e\u73b0\u516c\u5e73\u9501（\u6309\u8bf7\u6c42\u987a\u5e8f\u83b7\u53d6\u9501）<\/li>\n
- \u53ef\u5206\u79bb\u9501：\u914d\u5408Condition\u5b9e\u73b0\u66f4\u7075\u6d3b\u7684\u7ebf\u7a0b\u901a\u4fe1<\/li>\n<\/ul>\n
3.\u4e09\u79cd\u65b9\u6848\u7684\u5bf9\u6bd4<\/h6>\n
\n\u65b9\u6848\u5b9e\u73b0\u65b9\u5f0f\u7075\u6d3b\u6027\u6027\u80fd（\u4e00\u822c\u573a\u666f）\u9002\u7528\u573a\u666f<\/tr>\n \n\n\u540c\u6b65\u4ee3\u7801\u5757<\/td>\n synchronized(\u9501)<\/td>\n \u4e2d\u7b49<\/td>\n \u8f83\u597d<\/td>\n \u9700\u9501\u5b9a\u4ee3\u7801\u7247\u6bb5\u65f6<\/td>\n<\/tr>\n \n\u540c\u6b65\u65b9\u6cd5<\/td>\n synchronized\u4fee\u9970\u65b9\u6cd5<\/td>\n \u4f4e（\u7c92\u5ea6\u7c97）<\/td>\n \u4e00\u822c<\/td>\n \u7b80\u5355\u573a\u666f，\u6574\u4e2a\u65b9\u6cd5\u9700\u540c\u6b65\u65f6<\/td>\n<\/tr>\n \nLock\u9501<\/td>\n \u663e\u5f0flock()\/unlock()<\/td>\n \u9ad8<\/td>\n \u8f83\u597d（\u7ade\u4e89\u6fc0\u70c8\u65f6\u66f4\u4f18）<\/td>\n \u590d\u6742\u573a\u666f（\u8d85\u65f6\u3001\u516c\u5e73\u9501\u7b49）<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n\u6700\u4f73\u5b9e\u8df5：<\/p>\n<\/p>\n
\n- \u7b80\u5355\u573a\u666f\u4f18\u5148\u4f7f\u7528synchronized（\u4ee3\u7801\u7b80\u6d01，JVM \u4f18\u5316\u66f4\u597d）<\/li>\n
- \u590d\u6742\u573a\u666f（\u5982\u9700\u8981\u8d85\u65f6\u63a7\u5236\u3001\u516c\u5e73\u9501）\u4f7f\u7528Lock<\/li>\n
- \u5c3d\u91cf\u7f29\u5c0f\u540c\u6b65\u8303\u56f4（\u53ea\u9501\u5fc5\u8981\u7684\u4ee3\u7801），\u51cf\u5c11\u7ebf\u7a0b\u963b\u585e\u65f6\u95f4<\/li>\n<\/ul>\n","protected":false},"excerpt":{"rendered":"
\u6587\u7ae0\u6d4f\u89c8\u9605\u8bfb124\u6b21\uff0c\u70b9\u8d5e9\u6b21\uff0c\u6536\u85cf2\u6b21\u3002\u7ebf\u7a0b\uff08Thread\uff09\u662f\u64cd\u4f5c\u7cfb\u7edf\u80fd\u591f\u8fdb\u884c\uff0c\u5b83\u88ab\u5305\u542b\u5728\u8fdb\u7a0b\u4e4b\u4e2d\uff0c\u662f\u8fdb\u7a0b\u4e2d\u7684\u5b9e\u9645\u8fd0\u4f5c\u5355\u4f4d\u3002\u4e00\u4e2a\u8fdb\u7a0b\u53ef\u4ee5\u5305\u542b\u591a\u4e2a\u7ebf\u7a0b\uff0c\u8fd9\u4e9b\u7ebf\u7a0b\u5171\u4eab\u8be5\u8fdb\u7a0b\u7684\u8d44\u6e90\uff08\u5982\u5185\u5b58\u7a7a\u95f4\u3001\u6587\u4ef6\u63cf\u8ff0\u7b26\u7b49\uff09\uff0c\u4f46\u540c\u65f6\u62e5\u6709\u5404\u81ea\u72ec\u7acb\u7684\u6267\u884c\u6808\u3001\u7a0b\u5e8f\u8ba1\u6570\u5668\u548c\u5bc4\u5b58\u5668\u96c6\u5408\u3002<\/p>\n","protected":false},"author":2,"featured_media":52895,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[99,190],"topic":[],"class_list":["post-52897","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-server","tag-java","tag-190"],"yoast_head":"\n
Java\u8fdb\u9636\u6280\u672f3-\u591a\u7ebf\u7a0b - \u7f51\u7855\u4e92\u8054\u5e2e\u52a9\u4e2d\u5fc3<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.wsisp.com\/helps\/52897.html\" \/>\n<meta property=\"og:locale\" content=\"zh_CN\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Java\u8fdb\u9636\u6280\u672f3-\u591a\u7ebf\u7a0b - \u7f51\u7855\u4e92\u8054\u5e2e\u52a9\u4e2d\u5fc3\" \/>\n<meta property=\"og:description\" content=\"\u6587\u7ae0\u6d4f\u89c8\u9605\u8bfb124\u6b21\uff0c\u70b9\u8d5e9\u6b21\uff0c\u6536\u85cf2\u6b21\u3002\u7ebf\u7a0b\uff08Thread\uff09\u662f\u64cd\u4f5c\u7cfb\u7edf\u80fd\u591f\u8fdb\u884c\uff0c\u5b83\u88ab\u5305\u542b\u5728\u8fdb\u7a0b\u4e4b\u4e2d\uff0c\u662f\u8fdb\u7a0b\u4e2d\u7684\u5b9e\u9645\u8fd0\u4f5c\u5355\u4f4d\u3002\u4e00\u4e2a\u8fdb\u7a0b\u53ef\u4ee5\u5305\u542b\u591a\u4e2a\u7ebf\u7a0b\uff0c\u8fd9\u4e9b\u7ebf\u7a0b\u5171\u4eab\u8be5\u8fdb\u7a0b\u7684\u8d44\u6e90\uff08\u5982\u5185\u5b58\u7a7a\u95f4\u3001\u6587\u4ef6\u63cf\u8ff0\u7b26\u7b49\uff09\uff0c\u4f46\u540c\u65f6\u62e5\u6709\u5404\u81ea\u72ec\u7acb\u7684\u6267\u884c\u6808\u3001\u7a0b\u5e8f\u8ba1\u6570\u5668\u548c\u5bc4\u5b58\u5668\u96c6\u5408\u3002\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.wsisp.com\/helps\/52897.html\" \/>\n<meta property=\"og:site_name\" content=\"\u7f51\u7855\u4e92\u8054\u5e2e\u52a9\u4e2d\u5fc3\" \/>\n<meta property=\"article:published_time\" content=\"2025-08-11T13:14:22+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2025\/08\/20250811131421-6899ecadb2d4a.png\" \/>\n<meta name=\"author\" content=\"admin\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" 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=\"5 \u5206\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"WebPage\",\"@id\":\"https:\/\/www.wsisp.com\/helps\/52897.html\",\"url\":\"https:\/\/www.wsisp.com\/helps\/52897.html\",\"name\":\"Java\u8fdb\u9636\u6280\u672f3-\u591a\u7ebf\u7a0b - 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\u7f51\u7855\u4e92\u8054\u5e2e\u52a9\u4e2d\u5fc3","isPartOf":{"@id":"https:\/\/www.wsisp.com\/helps\/#website"},"datePublished":"2025-08-11T13:14:22+00:00","dateModified":"2025-08-11T13:14:22+00:00","author":{"@id":"https:\/\/www.wsisp.com\/helps\/#\/schema\/person\/358e386c577a3ab51c4493330a20ad41"},"breadcrumb":{"@id":"https:\/\/www.wsisp.com\/helps\/52897.html#breadcrumb"},"inLanguage":"zh-Hans","potentialAction":[{"@type":"ReadAction","target":["https:\/\/www.wsisp.com\/helps\/52897.html"]}]},{"@type":"BreadcrumbList","@id":"https:\/\/www.wsisp.com\/helps\/52897.html#breadcrumb","itemListElement":[{"@type":"ListItem","position":1,"name":"\u9996\u9875","item":"https:\/\/www.wsisp.com\/helps"},{"@type":"ListItem","position":2,"name":"Java\u8fdb\u9636\u6280\u672f3-\u591a\u7ebf\u7a0b"}]},{"@type":"WebSite","@id":"https:\/\/www.wsisp.com\/helps\/#website","url":"https:\/\/www.wsisp.com\/helps\/","name":"\u7f51\u7855\u4e92\u8054\u5e2e\u52a9\u4e2d\u5fc3","description":"\u9999\u6e2f\u670d\u52a1\u5668_\u9999\u6e2f\u4e91\u670d\u52a1\u5668\u8d44\u8baf_\u670d\u52a1\u5668\u5e2e\u52a9\u6587\u6863_\u670d\u52a1\u5668\u6559\u7a0b","potentialAction":[{"@type":"SearchAction","target":{"@type":"EntryPoint","urlTemplate":"https:\/\/www.wsisp.com\/helps\/?s={search_term_string}"},"query-input":"required name=search_term_string"}],"inLanguage":"zh-Hans"},{"@type":"Person","@id":"https:\/\/www.wsisp.com\/helps\/#\/schema\/person\/358e386c577a3ab51c4493330a20ad41","name":"admin","image":{"@type":"ImageObject","inLanguage":"zh-Hans","@id":"https:\/\/www.wsisp.com\/helps\/#\/schema\/person\/image\/","url":"https:\/\/gravatar.wp-china-yes.net\/avatar\/?s=96&d=mystery","contentUrl":"https:\/\/gravatar.wp-china-yes.net\/avatar\/?s=96&d=mystery","caption":"admin"},"sameAs":["http:\/\/wp.wsisp.com"],"url":"https:\/\/www.wsisp.com\/helps\/author\/admin"}]}},"_links":{"self":[{"href":"https:\/\/www.wsisp.com\/helps\/wp-json\/wp\/v2\/posts\/52897","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.wsisp.com\/helps\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.wsisp.com\/helps\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.wsisp.com\/helps\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/www.wsisp.com\/helps\/wp-json\/wp\/v2\/comments?post=52897"}],"version-history":[{"count":0,"href":"https:\/\/www.wsisp.com\/helps\/wp-json\/wp\/v2\/posts\/52897\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.wsisp.com\/helps\/wp-json\/wp\/v2\/media\/52895"}],"wp:attachment":[{"href":"https:\/\/www.wsisp.com\/helps\/wp-json\/wp\/v2\/media?parent=52897"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.wsisp.com\/helps\/wp-json\/wp\/v2\/categories?post=52897"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.wsisp.com\/helps\/wp-json\/wp\/v2\/tags?post=52897"},{"taxonomy":"topic","embeddable":true,"href":"https:\/\/www.wsisp.com\/helps\/wp-json\/wp\/v2\/topic?post=52897"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}
\u4e3e\u4f8b\u8bf4\u660e<\/h5>\n\n- \u6253\u5f00\u4e00\u4e2a\u6d4f\u89c8\u5668（\u8fdb\u7a0b），\u5176\u4e2d \u201c\u7f51\u9875\u6e32\u67d3\u201d\u201c\u4e0b\u8f7d\u6587\u4ef6\u201d\u201c\u64ad\u653e\u97f3\u9891\u201d \u7b49\u529f\u80fd\u53ef\u7531\u4e0d\u540c\u7ebf\u7a0b\u540c\u65f6\u6267\u884c，\u5b83\u4eec\u5171\u4eab\u6d4f\u89c8\u5668\u7684\u5185\u5b58\u548c\u7f51\u7edc\u8fde\u63a5\u3002<\/li>\n<\/ul>\n
\u4e8c. \u521b\u5efa\u7ebf\u7a0b\u7684\u56db\u79cd\u65b9\u5f0f<\/h3>\n1. \u7ee7\u627fThread\u7c7b\u5e76\u91cd\u5199run()\u65b9\u6cd5<\/h4>\n
\u6b65\u9aa4：<\/p>\n<\/p>\n
\n- \u5b9a\u4e49\u7c7b\u7ee7\u627fjava.lang.Thread\u7c7b<\/li>\n
- \u91cd\u5199run()\u65b9\u6cd5（\u7ebf\u7a0b\u6267\u884c\u7684\u6838\u5fc3\u903b\u8f91）<\/li>\n
- \u521b\u5efa\u7ebf\u7a0b\u5bf9\u8c61\u5e76\u8c03\u7528start()\u65b9\u6cd5\u542f\u52a8\u7ebf\u7a0b（\u800c\u975e\u76f4\u63a5\u8c03\u7528run()）<\/li>\n<\/ul>\n
\u793a\u4f8b\u4ee3\u7801：<\/p>\n
package com.itheima.ReStudy2;<\/p>\n
public class Demo1 {
\n public static void main(String[] args) {
\n Thread t = new MyThread();
\n t.start();
\n }
\n}
\nclass MyThread extends Thread{
\n @Override
\n public void run() {
\n System.out.println("\u606d\u559c\u4f60，\u521b\u5efa\u7ebf\u7a0b\u6210\u529f");
\n }
\n}<\/p>\n
\u7279\u70b9：<\/p>\n<\/p>\n
\n- \u5b9e\u73b0\u7b80\u5355，\u4f46\u53d7\u9650\u4e8e Java \u5355\u7ee7\u627f\u7279\u6027，\u7075\u6d3b\u6027\u8f83\u4f4e\u3002<\/li>\n<\/ul>\n
2. \u5b9e\u73b0Runnable\u63a5\u53e3<\/h4>\n
\u6b65\u9aa4：<\/p>\n<\/p>\n
\n- \u5b9a\u4e49\u7c7b\u5b9e\u73b0java.lang.Runnable\u63a5\u53e3<\/li>\n
- \u5b9e\u73b0run()\u65b9\u6cd5（\u7ebf\u7a0b\u6267\u884c\u903b\u8f91）<\/li>\n
- \u521b\u5efaThread\u5bf9\u8c61，\u5c06Runnable\u5b9e\u4f8b\u4f5c\u4e3a\u53c2\u6570\u4f20\u5165<\/li>\n
- \u8c03\u7528Thread\u5bf9\u8c61\u7684start()\u65b9\u6cd5\u542f\u52a8\u7ebf\u7a0b<\/li>\n<\/ul>\n
\u793a\u4f8b\u4ee3\u7801：<\/p>\n
package com.itheima.ReStudy2;<\/p>\n
public class Demo2 {
\n public static void main(String[] args) {<\/p>\n
Thread t = new Thread(new MyThread2());
\n t.start();
\n }
\n}
\nclass MyThread2 implements Runnable{
\n @Override
\n public void run() {
\n System.out.println("\u606d\u559c\u4f60，\u901a\u8fc7Runnable\u63a5\u53e3\u6210\u529f\u5b9e\u73b0\u4e86\u4e00\u4e2a\u7ebf\u7a0b");
\n }
\n}<\/p>\n
\u7279\u70b9：<\/p>\n<\/p>\n
\n- \u907f\u514d\u5355\u7ee7\u627f\u9650\u5236，\u53ef\u540c\u65f6\u5b9e\u73b0\u5176\u4ed6\u63a5\u53e3，\u63a8\u8350\u4f18\u5148\u4f7f\u7528\u3002<\/li>\n<\/ul>\n
3. \u5b9e\u73b0Callable\u63a5\u53e3（\u5e26\u8fd4\u56de\u503c\u7684\u7ebf\u7a0b）<\/h4>\n
\u6b65\u9aa4：<\/p>\n<\/p>\n
\n- \u5b9a\u4e49\u7c7b\u5b9e\u73b0java.util.concurrent.Callable<V>\u63a5\u53e3（V\u4e3a\u8fd4\u56de\u503c\u7c7b\u578b）<\/li>\n
- \u5b9e\u73b0call()\u65b9\u6cd5（\u7ebf\u7a0b\u903b\u8f91，\u53ef\u8fd4\u56de\u7ed3\u679c\u5e76\u629b\u51fa\u5f02\u5e38）<\/li>\n
- \u521b\u5efaFutureTask<V>\u5bf9\u8c61\u5305\u88c5Callable\u5b9e\u4f8b（\u7528\u4e8e\u83b7\u53d6\u8fd4\u56de\u503c）<\/li>\n
- \u521b\u5efaThread\u5bf9\u8c61\u4f20\u5165FutureTask，\u8c03\u7528start()\u542f\u52a8<\/li>\n
- \u901a\u8fc7FutureTask\u7684get()\u65b9\u6cd5\u83b7\u53d6\u7ebf\u7a0b\u6267\u884c\u7ed3\u679c<\/li>\n<\/ul>\n
\u793a\u4f8b\u4ee3\u7801：<\/p>\n
package com.itheima.ReStudy2;<\/p>\n
import java.util.Objects;
\nimport java.util.concurrent.Callable;
\nimport java.util.concurrent.ExecutionException;
\nimport java.util.concurrent.FutureTask;<\/p>\n
public class DEmo3Callable {
\n public static void main(String[] args) throws ExecutionException, InterruptedException {
\n FutureTask f = new FutureTask<Object>(new MyThread3());
\n Thread t = new Thread(f);
\n t.start();
\n String a = (String) f.get();
\n\/\/ \u9700\u8981\u901a\u8fc7FutureTask\u83b7\u53d6Callable\u7684\u8fd4\u56de\u503c
\n System.out.println(a);
\n }
\n}
\nclass MyThread3 implements Callable<Object>{
\n @Override
\n public Object call() throws Exception {
\n String a = "\u6267\u884cCallable\u6210\u529f \u8fd4\u56de\u4e86\u4e00\u4e2aString\u5b57\u7b26\u4e32！";
\n return a;
\n }
\n}<\/p>\n
\u7279\u70b9：<\/p>\n<\/p>\n
\n- \u652f\u6301\u8fd4\u56de\u6267\u884c\u7ed3\u679c，\u53ef\u629b\u51fa\u5f02\u5e38，\u9002\u7528\u4e8e\u9700\u8981\u7ebf\u7a0b\u6267\u884c\u7ed3\u679c\u7684\u573a\u666f（\u5982\u5e76\u884c\u8ba1\u7b97）\u3002<\/li>\n<\/ul>\n
\u6838\u5fc3\u533a\u522b\u603b\u7ed3<\/p>\n
\n\u65b9\u5f0f\u5b9e\u73b0\u590d\u6742\u5ea6\u662f\u5426\u6709\u8fd4\u56de\u503c\u7075\u6d3b\u6027\u9002\u7528\u573a\u666f<\/tr>\n \n\n\u7ee7\u627fThread<\/td>\n \u7b80\u5355<\/td>\n \u65e0<\/td>\n \u4f4e（\u5355\u7ee7\u627f）<\/td>\n \u7b80\u5355\u7ebf\u7a0b\u4efb\u52a1<\/td>\n<\/tr>\n \n\u5b9e\u73b0Runnable<\/td>\n \u4e2d\u7b49<\/td>\n \u65e0<\/td>\n \u9ad8<\/td>\n \u591a\u7ebf\u7a0b\u5171\u4eab\u8d44\u6e90\u6216\u9700\u591a\u5b9e\u73b0<\/td>\n<\/tr>\n \n\u5b9e\u73b0Callable<\/td>\n \u8f83\u9ad8<\/td>\n \u6709<\/td>\n \u9ad8<\/td>\n \u9700\u8981\u7ebf\u7a0b\u6267\u884c\u7ed3\u679c\u6216\u5f02\u5e38\u5904\u7406<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n\u5b9e\u9645\u5f00\u53d1\u4e2d，Runnable\u548cCallable\u56e0\u7075\u6d3b\u6027\u66f4\u5e38\u7528，\u5c24\u5176\u662f\u914d\u5408\u7ebf\u7a0b\u6c60\u4f7f\u7528\u65f6\u3002<\/p>\n
4.\u7ebf\u7a0b\u6c60<\/h4>\n
\u5728 Java \u4e2d，\u7ebf\u7a0b\u6c60\u662f\u7ba1\u7406\u7ebf\u7a0b\u751f\u547d\u5468\u671f\u7684\u91cd\u8981\u673a\u5236，\u80fd\u591f\u6709\u6548\u907f\u514d\u9891\u7e41\u521b\u5efa \/ \u9500\u6bc1\u7ebf\u7a0b\u7684\u6027\u80fd\u5f00\u9500\u3002\u4f60\u63d0\u5230\u7684\u5e94\u8be5\u662fThreadPoolExecutor（\u6838\u5fc3\u5b9e\u73b0\u7c7b）\u548cExecutors（\u5de5\u5177\u7c7b），\u4e0b\u9762\u8be6\u7ec6\u4ecb\u7ecd：<\/p>\n
4.1 \u6838\u5fc3\u5b9e\u73b0\u7c7b：ThreadPoolExecutor<\/h5>\n
ThreadPoolExecutor\u662f\u7ebf\u7a0b\u6c60\u7684\u6838\u5fc3\u5b9e\u73b0\u7c7b，\u4f4d\u4e8ejava.util.concurrent\u5305\u4e0b，\u901a\u8fc7\u7075\u6d3b\u914d\u7f6e\u53c2\u6570\u53ef\u6ee1\u8db3\u4e0d\u540c\u573a\u666f\u9700\u6c42\u3002<\/p>\n
\u6838\u5fc3\u6784\u9020\u53c2\u6570<\/h5>\n
public ThreadPoolExecutor(
\n int corePoolSize, \/\/ \u6838\u5fc3\u7ebf\u7a0b\u6570（\u59cb\u7ec8\u5b58\u6d3b\u7684\u7ebf\u7a0b\u6570）
\n int maximumPoolSize, \/\/ \u6700\u5927\u7ebf\u7a0b\u6570（\u7ebf\u7a0b\u6c60\u5141\u8bb8\u7684\u6700\u5927\u7ebf\u7a0b\u6570）
\n long keepAliveTime, \/\/ \u975e\u6838\u5fc3\u7ebf\u7a0b\u7a7a\u95f2\u8d85\u65f6\u65f6\u95f4
\n TimeUnit unit, \/\/ \u8d85\u65f6\u65f6\u95f4\u5355\u4f4d（\u5982TimeUnit.SECONDS）
\n BlockingQueue<Runnable> workQueue, \/\/ \u4efb\u52a1\u7b49\u5f85\u961f\u5217（\u5b58\u653e\u672a\u6267\u884c\u7684\u4efb\u52a1）
\n ThreadFactory threadFactory, \/\/ \u7ebf\u7a0b\u5de5\u5382（\u7528\u4e8e\u521b\u5efa\u7ebf\u7a0b）
\n RejectedExecutionHandler handler \/\/ \u62d2\u7edd\u7b56\u7565（\u4efb\u52a1\u6ee1\u65f6\u7684\u5904\u7406\u65b9\u5f0f）
\n)<\/p>\n
\u5e38\u7528\u62d2\u7edd\u7b56\u7565<\/h5>\n
- AbortPolicy（\u9ed8\u8ba4）：\u76f4\u63a5\u629b\u51faRejectedExecutionException\u5f02\u5e38<\/li>\n
- CallerRunsPolicy：\u8ba9\u63d0\u4ea4\u4efb\u52a1\u7684\u7ebf\u7a0b\u81ea\u5df1\u6267\u884c\u4efb\u52a1<\/li>\n
- DiscardPolicy：\u76f4\u63a5\u4e22\u5f03\u4efb\u52a1（\u4e0d\u629b\u5f02\u5e38）<\/li>\n
- DiscardOldestPolicy：\u4e22\u5f03\u961f\u5217\u4e2d\u6700\u65e7\u7684\u4efb\u52a1，\u518d\u5c1d\u8bd5\u63d0\u4ea4\u65b0\u4efb\u52a1<\/li>\n
\u793a\u4f8b\u4ee3\u7801：<\/h5>\n
package com.itheima.ReStudy2;<\/p>\n
import java.util.concurrent.ArrayBlockingQueue;
\nimport java.util.concurrent.Executors;
\nimport java.util.concurrent.ThreadPoolExecutor;
\nimport java.util.concurrent.TimeUnit;<\/p>\n
public class Demo4ThreadPoolExecutor {
\n public static void main(String[] args) {
\n ThreadPoolExecutor executor = new ThreadPoolExecutor(
\n 3,\/\/\u6838\u5fc3\u7ebf\u7a0b\u6570
\n 5, \/\/\u6700\u5927\u7ebf\u7a0b\u6570
\n 10,\/\/\u7ebf\u7a0b\u7a7a\u95f2\u65f6\u95f4
\n TimeUnit.SECONDS,\/\/\u9500\u6bc1\u65f6\u95f4\u5355\u4f4d
\n new ArrayBlockingQueue<>(4),\/\/\u4efb\u52a1\u961f\u5217
\n Executors.defaultThreadFactory(),\/\/\u7ebf\u7a0b\u5de5\u5382
\n new ThreadPoolExecutor.AbortPolicy()\/\/\u62d2\u7edd\u7b56\u7565
\n );
\n for (int i = 0; i < 15; i++) {
\n executor.execute(new MyThread4());
\n System.out.println("\u5f53\u524d\u7ebf\u7a0b\u6570："+executor.getPoolSize());
\n System.out.println("\u5f53\u524d\u6392\u961f\u7ebf\u7a0b\u6570："+executor.getQueue().size());
\n try {
\n Thread.sleep(1000);
\n } catch (InterruptedException e) {
\n e.printStackTrace();
\n }
\n }
\n executor.shutdown();
\n }
\n}
\nclass MyThread4 implements Runnable{
\n public void run()
\n {
\n System.out.println(Thread.currentThread().getName()+"\u6267\u884c\u4e86");
\n }
\n}<\/p>\n
4.2 \u5de5\u5177\u7c7b：Executors<\/h5>\n
Executors\u63d0\u4f9b\u4e86\u4fbf\u6377\u7684\u9759\u6001\u65b9\u6cd5，\u53ef\u5feb\u901f\u521b\u5efa\u9884\u914d\u7f6e\u7684\u7ebf\u7a0b\u6c60（\u5e95\u5c42\u4ecd\u57fa\u4e8eThreadPoolExecutor），\u9002\u5408\u7b80\u5355\u573a\u666f\u3002\u4f46\u963f\u91cc\u5df4\u5df4\u5f00\u53d1\u624b\u518c\u4e0d\u63a8\u8350\u4f7f\u7528，\u56e0\u9ed8\u8ba4\u53c2\u6570\u53ef\u80fd\u5bfc\u81f4\u8d44\u6e90\u8017\u5c3d（\u5982\u65e0\u754c\u961f\u5217）\u3002<\/p>\n
\u5e38\u7528\u65b9\u6cd5<\/h5>\n
- \n
Executors.newFixedThreadPool(int nThreads)<\/p>\n
\n- \u56fa\u5b9a\u5927\u5c0f\u7684\u7ebf\u7a0b\u6c60（\u6838\u5fc3\u7ebf\u7a0b\u6570 = \u6700\u5927\u7ebf\u7a0b\u6570）<\/li>\n
- \u961f\u5217\u4f7f\u7528LinkedBlockingQueue（\u65e0\u754c，\u53ef\u80fd\u5806\u79ef\u5927\u91cf\u4efb\u52a1\u5bfc\u81f4 OOM<\/li>\n<\/ul>\n<\/li>\n
ExecutorService fixedPool = Executors.newFixedThreadPool(5); \/\/ \u56fa\u5b9a5\u4e2a\u7ebf\u7a0b<\/p>\n
Executors.newCachedThreadPool()<\/p>\n
\n- \u53ef\u7f13\u5b58\u7684\u7ebf\u7a0b\u6c60（\u6838\u5fc3\u7ebf\u7a0b\u6570 = 0，\u6700\u5927\u7ebf\u7a0b\u6570 = Integer.MAX_VALUE）<\/li>\n
- \u7a7a\u95f2\u7ebf\u7a0b 60 \u79d2\u540e\u9500\u6bc1，\u9002\u5408\u77ed\u671f\u4efb\u52a1<\/li>\n
- \u98ce\u9669：\u4efb\u52a1\u8fc7\u591a\u65f6\u53ef\u80fd\u521b\u5efa\u5927\u91cf\u7ebf\u7a0b\u5bfc\u81f4 OOM<\/li>\n<\/ul>\n
ExecutorService cachedPool = Executors.newCachedThreadPool();<\/p>\n
Executors.newSingleThreadExecutor()<\/p>\n
\n- \u5355\u7ebf\u7a0b\u6c60（\u6838\u5fc3\u7ebf\u7a0b\u6570 = \u6700\u5927\u7ebf\u7a0b\u6570 = 1）<\/li>\n
- \u6240\u6709\u4efb\u52a1\u6309\u987a\u5e8f\u6267\u884c，\u9002\u5408\u9700\u8981\u4e32\u884c\u6267\u884c\u7684\u573a\u666f<\/li>\n<\/ul>\n
ExecutorService singlePool = Executors.newSingleThreadExecutor();<\/p>\n
Executors.newScheduledThreadPool(int corePoolSize)<\/p>\n
\n- \u5b9a\u65f6\u4efb\u52a1\u7ebf\u7a0b\u6c60，\u652f\u6301\u5ef6\u8fdf\u6267\u884c\u6216\u5468\u671f\u6027\u6267\u884c<\/li>\n<\/ul>\n
ScheduledExecutorService scheduledPool = Executors.newScheduledThreadPool(3);
\n\/\/ \u5ef6\u8fdf1\u79d2\u540e\u6267\u884c
\nscheduledPool.schedule(() -> System.out.println("\u5ef6\u8fdf\u6267\u884c"), 1, TimeUnit.SECONDS);
\n\/\/ \u5ef6\u8fdf2\u79d2\u540e，\u6bcf3\u79d2\u6267\u884c\u4e00\u6b21
\nscheduledPool.scheduleAtFixedRate(() -> System.out.println("\u5468\u671f\u6267\u884c"), 2, 3, TimeUnit.SECONDS);<\/p>\n
4.3 \u7ebf\u7a0b\u6c60\u4f7f\u7528\u6d41\u7a0b<\/h5>\n
- \u521b\u5efa\u7ebf\u7a0b\u6c60（\u63a8\u8350ThreadPoolExecutor\u624b\u52a8\u914d\u7f6e\u53c2\u6570）<\/li>\n
- \u901a\u8fc7submit()\u6216execute()\u63d0\u4ea4\u4efb\u52a1（submit()\u53ef\u8fd4\u56deFuture\u83b7\u53d6\u7ed3\u679c）<\/li>\n
- \u4efb\u52a1\u6267\u884c\u5b8c\u6bd5\u540e，\u8c03\u7528shutdown()（\u5e73\u7f13\u5173\u95ed）\u6216shutdownNow()（\u5f3a\u5236\u5173\u95ed）<\/li>\n
4.4 \u6838\u5fc3\u533a\u522b\u4e0e\u5efa\u8bae<\/h5>\n
\n\u7c7b\u578b\u4f18\u52bf\u52a3\u52bf\u5efa\u8bae\u573a\u666f<\/tr>\n \n\nThreadPoolExecutor<\/td>\n \u53c2\u6570\u53ef\u63a7，\u7075\u6d3b\u9002\u914d\u573a\u666f<\/td>\n \u914d\u7f6e\u590d\u6742<\/td>\n \u751f\u4ea7\u73af\u5883，\u9700\u7cbe\u7ec6\u63a7\u5236\u8d44\u6e90<\/td>\n<\/tr>\n \nExecutors\u5de5\u5177\u7c7b<\/td>\n \u5feb\u901f\u521b\u5efa，\u4ee3\u7801\u7b80\u6d01<\/td>\n \u9ed8\u8ba4\u53c2\u6570\u6709\u6f5c\u5728\u98ce\u9669（\u5982 OOM）<\/td>\n \u7b80\u5355\u573a\u666f\u6216\u6d4b\u8bd5\u73af\u5883<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n\u6700\u4f73\u5b9e\u8df5：\u751f\u4ea7\u73af\u5883\u4e2d\u63a8\u8350\u76f4\u63a5\u4f7f\u7528ThreadPoolExecutor，\u6839\u636e\u4e1a\u52a1\u9700\u6c42\u5408\u7406\u8bbe\u7f6e\u6838\u5fc3\u7ebf\u7a0b\u6570\u3001\u961f\u5217\u5927\u5c0f\u548c\u62d2\u7edd\u7b56\u7565，\u907f\u514d\u8d44\u6e90\u8017\u5c3d\u98ce\u9669\u3002<\/p>\n
\u4e09. \u591a\u7ebf\u7a0b\u5e76\u53d1\u5b89\u5168\u89e3\u51b3<\/h3>\n
\u5728\u591a\u7ebf\u7a0b\u73af\u5883\u4e2d，\u5f53\u591a\u4e2a\u7ebf\u7a0b\u540c\u65f6\u64cd\u4f5c\u5171\u4eab\u8d44\u6e90\u65f6，\u53ef\u80fd\u4f1a\u5bfc\u81f4\u6570\u636e\u4e0d\u4e00\u81f4\u3001\u903b\u8f91\u9519\u8bef\u7b49\u95ee\u9898，\u8fd9\u5c31\u662f\u5e76\u53d1\u5b89\u5168\u95ee\u9898\u3002<\/p>\n
1. \u5e76\u53d1\u5b89\u5168\u95ee\u9898\u7684\u4ea7\u751f\u6761\u4ef6<\/h5>\n
- \u591a\u7ebf\u7a0b\u73af\u5883：\u5b58\u5728\u591a\u4e2a\u7ebf\u7a0b\u540c\u65f6\u6267\u884c<\/li>\n
- \u5171\u4eab\u8d44\u6e90：\u7ebf\u7a0b\u64cd\u4f5c\u540c\u4e00\u4efd\u53ef\u4fee\u6539\u7684\u8d44\u6e90（\u5982\u5168\u5c40\u53d8\u91cf\u3001\u9759\u6001\u53d8\u91cf\u3001\u5bf9\u8c61\u5c5e\u6027\u7b49）<\/li>\n
- \u975e\u539f\u5b50\u64cd\u4f5c：\u5bf9\u5171\u4eab\u8d44\u6e90\u7684\u64cd\u4f5c\u4e0d\u662f\u4e00\u6b65\u5b8c\u6210\u7684（\u5982i++\u5b9e\u9645\u5305\u542b\u8bfb\u53d6\u3001\u4fee\u6539\u3001\u5199\u5165\u4e09\u6b65）<\/li>\n
\u793a\u4f8b：\u4e0d\u5b89\u5168\u7684\u591a\u7ebf\u7a0b\u64cd\u4f5c<\/p>\n
public class UnsafeThreadDemo {
\n private static int count = 0; \/\/ \u5171\u4eab\u8d44\u6e90<\/p>\n
public static void main(String[] args) throws InterruptedException {
\n \/\/ \u521b\u5efa1000\u4e2a\u7ebf\u7a0b，\u6bcf\u4e2a\u7ebf\u7a0b\u5bf9count\u52a0100\u6b21
\n Runnable task = () -> {
\n for (int i = 0; i < 100; i++) {
\n count++; \/\/ \u975e\u539f\u5b50\u64cd\u4f5c，\u5b58\u5728\u5b89\u5168\u95ee\u9898
\n }
\n };<\/p>\n
Thread[] threads = new Thread[1000];
\n for (int i = 0; i < 1000; i++) {
\n threads[i] = new Thread(task);
\n threads[i].start();
\n }<\/p>\n
\/\/ \u7b49\u5f85\u6240\u6709\u7ebf\u7a0b\u6267\u884c\u5b8c\u6bd5
\n for (int i = 0; i < 1000; i++) {
\n threads[i].join();
\n }<\/p>\n
System.out.println("\u6700\u7ec8\u7ed3\u679c：" + count); \/\/ \u9884\u671f100000，\u5b9e\u9645\u5f80\u5f80\u5c0f\u4e8e\u8be5\u503c
\n }
\n}<\/p>\n
<\/p>\n
\u95ee\u9898\u539f\u56e0：\u591a\u4e2a\u7ebf\u7a0b\u540c\u65f6\u8bfb\u53d6count\u7684\u503c，\u4fee\u6539\u540e\u518d\u5199\u56de（\u7531\u4e8e\u7ebf\u7a0b\u6267\u884c\u5e76\u53d1\u673a\u5236），\u5bfc\u81f4\u90e8\u5206\u589e\u91cf\u64cd\u4f5c\u88ab\u8986\u76d6\u3002<\/p>\n
\u4e8c\u3001\u5e76\u53d1\u5b89\u5168\u95ee\u9898\u7684\u89e3\u51b3\u65b9\u6848<\/h5>\n1. \u540c\u6b65\u9501（synchronized\u4ee3\u7801\u5757）<\/h6>\n
\u901a\u8fc7\u00a0synchronized\u5173\u952e\u5b57\u9501\u5b9a\u5171\u4eab\u8d44\u6e90，\u786e\u4fdd\u540c\u4e00\u65f6\u95f4\u53ea\u6709\u4e00\u4e2a\u7ebf\u7a0b\u80fd\u6267\u884c\u4e34\u754c\u533a\u4ee3\u7801\u3002<\/p>\n<\/p>\n
\u8bed\u6cd5：<\/p>\n
synchronized (\u9501\u5bf9\u8c61) { \/\/ \u64cd\u4f5c\u5171\u4eab\u8d44\u6e90\u7684\u4ee3\u7801（\u4e34\u754c\u533a） }<\/p>\n
\u793a\u4f8b：<\/p>\n
public class SynchronizedBlockDemo {
\n private static int count = 0;
\n private static final Object lock = new Object(); \/\/ \u9501\u5bf9\u8c61（\u63a8\u8350\u4f7f\u7528\u4e13\u7528\u5bf9\u8c61）<\/p>\n
public static void main(String[] args) throws InterruptedException {
\n Runnable task = () -> {
\n for (int i = 0; i < 100; i++) {
\n synchronized (lock) { \/\/ \u9501\u5b9a\u4e34\u754c\u533a
\n count++;
\n }
\n }
\n };<\/p>\n
\/\/ \u542f\u52a8\u7ebf\u7a0b\u903b\u8f91\u540c\u4e0a…
\n Thread[] threads = new Thread[1000];
\n for (int i = 0; i < 1000; i++) {
\n threads[i] = new Thread(task);
\n threads[i].start();
\n }<\/p>\n
for (int i = 0; i < 1000; i++) {
\n threads[i].join();
\n }<\/p>\n
System.out.println("\u6700\u7ec8\u7ed3\u679c：" + count); \/\/ \u6b63\u786e\u8f93\u51fa100000
\n }
\n}<\/p>\n
\u7279\u70b9：<\/p>\n<\/p>\n
\n- \u9501\u5bf9\u8c61\u53ef\u4ee5\u662f\u4efb\u610f\u5bf9\u8c61，\u4f46\u591a\u4e2a\u7ebf\u7a0b\u5fc5\u987b\u4f7f\u7528\u540c\u4e00\u4e2a\u9501\u5bf9\u8c61\u624d\u80fd\u4fdd\u8bc1\u540c\u6b65<\/li>\n
- \u63a8\u8350\u4f7f\u7528private static final Object\u4f5c\u4e3a\u9501\u5bf9\u8c61，\u907f\u514d\u9501\u5bf9\u8c61\u88ab\u4fee\u6539<\/li>\n<\/ul>\n
2. \u540c\u6b65\u65b9\u6cd5（synchronized\u65b9\u6cd5）<\/h6>\n
\u5c06\u00a0synchronized\u5173\u952e\u5b57\u4fee\u9970\u5728\u65b9\u6cd5\u4e0a，\u6b64\u65f6\u9501\u5bf9\u8c61\u4e3a：<\/p>\n<\/p>\n
\n- \u975e\u9759\u6001\u65b9\u6cd5：\u5f53\u524d\u5bf9\u8c61（this）<\/li>\n
- \u9759\u6001\u65b9\u6cd5：\u5f53\u524d\u7c7b\u7684Class\u5bf9\u8c61<\/li>\n<\/ul>\n
\u793a\u4f8b：<\/p>\n
public class SynchronizedMethodDemo {
\n private static int count = 0;<\/p>\n
\/\/ \u9759\u6001\u540c\u6b65\u65b9\u6cd5（\u9501\u5bf9\u8c61\u4e3aSynchronizedMethodDemo.class）
\n private static synchronized void increment() {
\n count++;
\n }<\/p>\n
public static void main(String[] args) throws InterruptedException {
\n Runnable task = () -> {
\n for (int i = 0; i < 100; i++) {
\n increment(); \/\/ \u8c03\u7528\u540c\u6b65\u65b9\u6cd5
\n }
\n };<\/p>\n
\/\/ \u542f\u52a8\u7ebf\u7a0b\u903b\u8f91\u540c\u4e0a…
\n Thread[] threads = new Thread[1000];
\n for (int i = 0; i < 1000; i++) {
\n threads[i] = new Thread(task);
\n threads[i].start();
\n }<\/p>\n
for (int i = 0; i < 1000; i++) {
\n threads[i].join();
\n }<\/p>\n
System.out.println("\u6700\u7ec8\u7ed3\u679c：" + count); \/\/ \u6b63\u786e\u8f93\u51fa100000
\n }
\n}<\/p>\n
<\/p>\n
Lock\u76f8\u6bd4synchronized\u7684\u4f18\u52bf：<\/p>\n<\/p>\n
\n- \u53ef\u4e2d\u65ad\u9501：\u652f\u6301tryLock(long time, TimeUnit unit)\u8d85\u65f6\u83b7\u53d6\u9501，\u907f\u514d\u6b7b\u9501<\/li>\n
- \u53ef\u5c1d\u8bd5\u83b7\u53d6\u9501：tryLock()\u65b9\u6cd5\u5c1d\u8bd5\u83b7\u53d6\u9501，\u5931\u8d25\u5219\u7acb\u5373\u8fd4\u56de<\/li>\n
- \u516c\u5e73\u9501：ReentrantLock\u53ef\u901a\u8fc7\u6784\u9020\u53c2\u6570new ReentrantLock(true)\u5b9e\u73b0\u516c\u5e73\u9501（\u6309\u8bf7\u6c42\u987a\u5e8f\u83b7\u53d6\u9501）<\/li>\n
- \u53ef\u5206\u79bb\u9501：\u914d\u5408Condition\u5b9e\u73b0\u66f4\u7075\u6d3b\u7684\u7ebf\u7a0b\u901a\u4fe1<\/li>\n<\/ul>\n
3.\u4e09\u79cd\u65b9\u6848\u7684\u5bf9\u6bd4<\/h6>\n
\n\u65b9\u6848\u5b9e\u73b0\u65b9\u5f0f\u7075\u6d3b\u6027\u6027\u80fd（\u4e00\u822c\u573a\u666f）\u9002\u7528\u573a\u666f<\/tr>\n \n\n\u540c\u6b65\u4ee3\u7801\u5757<\/td>\n synchronized(\u9501)<\/td>\n \u4e2d\u7b49<\/td>\n \u8f83\u597d<\/td>\n \u9700\u9501\u5b9a\u4ee3\u7801\u7247\u6bb5\u65f6<\/td>\n<\/tr>\n \n\u540c\u6b65\u65b9\u6cd5<\/td>\n synchronized\u4fee\u9970\u65b9\u6cd5<\/td>\n \u4f4e（\u7c92\u5ea6\u7c97）<\/td>\n \u4e00\u822c<\/td>\n \u7b80\u5355\u573a\u666f，\u6574\u4e2a\u65b9\u6cd5\u9700\u540c\u6b65\u65f6<\/td>\n<\/tr>\n \nLock\u9501<\/td>\n \u663e\u5f0flock()\/unlock()<\/td>\n \u9ad8<\/td>\n \u8f83\u597d（\u7ade\u4e89\u6fc0\u70c8\u65f6\u66f4\u4f18）<\/td>\n \u590d\u6742\u573a\u666f（\u8d85\u65f6\u3001\u516c\u5e73\u9501\u7b49）<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n\u6700\u4f73\u5b9e\u8df5：<\/p>\n<\/p>\n
\n- \u7b80\u5355\u573a\u666f\u4f18\u5148\u4f7f\u7528synchronized（\u4ee3\u7801\u7b80\u6d01，JVM \u4f18\u5316\u66f4\u597d）<\/li>\n
- \u590d\u6742\u573a\u666f（\u5982\u9700\u8981\u8d85\u65f6\u63a7\u5236\u3001\u516c\u5e73\u9501）\u4f7f\u7528Lock<\/li>\n
- \u5c3d\u91cf\u7f29\u5c0f\u540c\u6b65\u8303\u56f4（\u53ea\u9501\u5fc5\u8981\u7684\u4ee3\u7801），\u51cf\u5c11\u7ebf\u7a0b\u963b\u585e\u65f6\u95f4<\/li>\n<\/ul>\n","protected":false},"excerpt":{"rendered":"
\u6587\u7ae0\u6d4f\u89c8\u9605\u8bfb124\u6b21\uff0c\u70b9\u8d5e9\u6b21\uff0c\u6536\u85cf2\u6b21\u3002\u7ebf\u7a0b\uff08Thread\uff09\u662f\u64cd\u4f5c\u7cfb\u7edf\u80fd\u591f\u8fdb\u884c\uff0c\u5b83\u88ab\u5305\u542b\u5728\u8fdb\u7a0b\u4e4b\u4e2d\uff0c\u662f\u8fdb\u7a0b\u4e2d\u7684\u5b9e\u9645\u8fd0\u4f5c\u5355\u4f4d\u3002\u4e00\u4e2a\u8fdb\u7a0b\u53ef\u4ee5\u5305\u542b\u591a\u4e2a\u7ebf\u7a0b\uff0c\u8fd9\u4e9b\u7ebf\u7a0b\u5171\u4eab\u8be5\u8fdb\u7a0b\u7684\u8d44\u6e90\uff08\u5982\u5185\u5b58\u7a7a\u95f4\u3001\u6587\u4ef6\u63cf\u8ff0\u7b26\u7b49\uff09\uff0c\u4f46\u540c\u65f6\u62e5\u6709\u5404\u81ea\u72ec\u7acb\u7684\u6267\u884c\u6808\u3001\u7a0b\u5e8f\u8ba1\u6570\u5668\u548c\u5bc4\u5b58\u5668\u96c6\u5408\u3002<\/p>\n","protected":false},"author":2,"featured_media":52895,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[99,190],"topic":[],"class_list":["post-52897","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-server","tag-java","tag-190"],"yoast_head":"\n
Java\u8fdb\u9636\u6280\u672f3-\u591a\u7ebf\u7a0b - \u7f51\u7855\u4e92\u8054\u5e2e\u52a9\u4e2d\u5fc3<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.wsisp.com\/helps\/52897.html\" \/>\n<meta property=\"og:locale\" content=\"zh_CN\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Java\u8fdb\u9636\u6280\u672f3-\u591a\u7ebf\u7a0b - \u7f51\u7855\u4e92\u8054\u5e2e\u52a9\u4e2d\u5fc3\" \/>\n<meta property=\"og:description\" content=\"\u6587\u7ae0\u6d4f\u89c8\u9605\u8bfb124\u6b21\uff0c\u70b9\u8d5e9\u6b21\uff0c\u6536\u85cf2\u6b21\u3002\u7ebf\u7a0b\uff08Thread\uff09\u662f\u64cd\u4f5c\u7cfb\u7edf\u80fd\u591f\u8fdb\u884c\uff0c\u5b83\u88ab\u5305\u542b\u5728\u8fdb\u7a0b\u4e4b\u4e2d\uff0c\u662f\u8fdb\u7a0b\u4e2d\u7684\u5b9e\u9645\u8fd0\u4f5c\u5355\u4f4d\u3002\u4e00\u4e2a\u8fdb\u7a0b\u53ef\u4ee5\u5305\u542b\u591a\u4e2a\u7ebf\u7a0b\uff0c\u8fd9\u4e9b\u7ebf\u7a0b\u5171\u4eab\u8be5\u8fdb\u7a0b\u7684\u8d44\u6e90\uff08\u5982\u5185\u5b58\u7a7a\u95f4\u3001\u6587\u4ef6\u63cf\u8ff0\u7b26\u7b49\uff09\uff0c\u4f46\u540c\u65f6\u62e5\u6709\u5404\u81ea\u72ec\u7acb\u7684\u6267\u884c\u6808\u3001\u7a0b\u5e8f\u8ba1\u6570\u5668\u548c\u5bc4\u5b58\u5668\u96c6\u5408\u3002\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.wsisp.com\/helps\/52897.html\" \/>\n<meta property=\"og:site_name\" content=\"\u7f51\u7855\u4e92\u8054\u5e2e\u52a9\u4e2d\u5fc3\" \/>\n<meta property=\"article:published_time\" content=\"2025-08-11T13:14:22+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2025\/08\/20250811131421-6899ecadb2d4a.png\" \/>\n<meta name=\"author\" content=\"admin\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" 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=\"5 \u5206\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"WebPage\",\"@id\":\"https:\/\/www.wsisp.com\/helps\/52897.html\",\"url\":\"https:\/\/www.wsisp.com\/helps\/52897.html\",\"name\":\"Java\u8fdb\u9636\u6280\u672f3-\u591a\u7ebf\u7a0b - 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\u4e8c. \u521b\u5efa\u7ebf\u7a0b\u7684\u56db\u79cd\u65b9\u5f0f<\/h3>\n1. \u7ee7\u627fThread\u7c7b\u5e76\u91cd\u5199run()\u65b9\u6cd5<\/h4>\n
\u6b65\u9aa4：<\/p>\n<\/p>\n
- \n
- \u5b9a\u4e49\u7c7b\u7ee7\u627fjava.lang.Thread\u7c7b<\/li>\n
- \u91cd\u5199run()\u65b9\u6cd5（\u7ebf\u7a0b\u6267\u884c\u7684\u6838\u5fc3\u903b\u8f91）<\/li>\n
- \u521b\u5efa\u7ebf\u7a0b\u5bf9\u8c61\u5e76\u8c03\u7528start()\u65b9\u6cd5\u542f\u52a8\u7ebf\u7a0b（\u800c\u975e\u76f4\u63a5\u8c03\u7528run()）<\/li>\n<\/ul>\n
\u793a\u4f8b\u4ee3\u7801：<\/p>\n
package com.itheima.ReStudy2;<\/p>\n
public class Demo1 {
\n public static void main(String[] args) {
\n Thread t = new MyThread();
\n t.start();
\n }
\n}
\nclass MyThread extends Thread{
\n @Override
\n public void run() {
\n System.out.println("\u606d\u559c\u4f60，\u521b\u5efa\u7ebf\u7a0b\u6210\u529f");
\n }
\n}<\/p>\n\u7279\u70b9：<\/p>\n<\/p>\n
- \n
- \u5b9e\u73b0\u7b80\u5355，\u4f46\u53d7\u9650\u4e8e Java \u5355\u7ee7\u627f\u7279\u6027，\u7075\u6d3b\u6027\u8f83\u4f4e\u3002<\/li>\n<\/ul>\n
2. \u5b9e\u73b0Runnable\u63a5\u53e3<\/h4>\n
\u6b65\u9aa4：<\/p>\n<\/p>\n
- \n
- \u5b9a\u4e49\u7c7b\u5b9e\u73b0java.lang.Runnable\u63a5\u53e3<\/li>\n
- \u5b9e\u73b0run()\u65b9\u6cd5（\u7ebf\u7a0b\u6267\u884c\u903b\u8f91）<\/li>\n
- \u521b\u5efaThread\u5bf9\u8c61，\u5c06Runnable\u5b9e\u4f8b\u4f5c\u4e3a\u53c2\u6570\u4f20\u5165<\/li>\n
- \u8c03\u7528Thread\u5bf9\u8c61\u7684start()\u65b9\u6cd5\u542f\u52a8\u7ebf\u7a0b<\/li>\n<\/ul>\n
\u793a\u4f8b\u4ee3\u7801：<\/p>\n
package com.itheima.ReStudy2;<\/p>\n
public class Demo2 {
\n public static void main(String[] args) {<\/p>\nThread t = new Thread(new MyThread2());
\n t.start();
\n }
\n}
\nclass MyThread2 implements Runnable{
\n @Override
\n public void run() {
\n System.out.println("\u606d\u559c\u4f60，\u901a\u8fc7Runnable\u63a5\u53e3\u6210\u529f\u5b9e\u73b0\u4e86\u4e00\u4e2a\u7ebf\u7a0b");
\n }
\n}<\/p>\n\u7279\u70b9：<\/p>\n<\/p>\n
- \n
- \u907f\u514d\u5355\u7ee7\u627f\u9650\u5236，\u53ef\u540c\u65f6\u5b9e\u73b0\u5176\u4ed6\u63a5\u53e3，\u63a8\u8350\u4f18\u5148\u4f7f\u7528\u3002<\/li>\n<\/ul>\n
3. \u5b9e\u73b0Callable\u63a5\u53e3（\u5e26\u8fd4\u56de\u503c\u7684\u7ebf\u7a0b）<\/h4>\n
\u6b65\u9aa4：<\/p>\n<\/p>\n
- \n
- \u5b9a\u4e49\u7c7b\u5b9e\u73b0java.util.concurrent.Callable<V>\u63a5\u53e3（V\u4e3a\u8fd4\u56de\u503c\u7c7b\u578b）<\/li>\n
- \u5b9e\u73b0call()\u65b9\u6cd5（\u7ebf\u7a0b\u903b\u8f91，\u53ef\u8fd4\u56de\u7ed3\u679c\u5e76\u629b\u51fa\u5f02\u5e38）<\/li>\n
- \u521b\u5efaFutureTask<V>\u5bf9\u8c61\u5305\u88c5Callable\u5b9e\u4f8b（\u7528\u4e8e\u83b7\u53d6\u8fd4\u56de\u503c）<\/li>\n
- \u521b\u5efaThread\u5bf9\u8c61\u4f20\u5165FutureTask，\u8c03\u7528start()\u542f\u52a8<\/li>\n
- \u901a\u8fc7FutureTask\u7684get()\u65b9\u6cd5\u83b7\u53d6\u7ebf\u7a0b\u6267\u884c\u7ed3\u679c<\/li>\n<\/ul>\n
\u793a\u4f8b\u4ee3\u7801：<\/p>\n
package com.itheima.ReStudy2;<\/p>\n
import java.util.Objects;
\nimport java.util.concurrent.Callable;
\nimport java.util.concurrent.ExecutionException;
\nimport java.util.concurrent.FutureTask;<\/p>\npublic class DEmo3Callable {
\n public static void main(String[] args) throws ExecutionException, InterruptedException {
\n FutureTask f = new FutureTask<Object>(new MyThread3());
\n Thread t = new Thread(f);
\n t.start();
\n String a = (String) f.get();
\n\/\/ \u9700\u8981\u901a\u8fc7FutureTask\u83b7\u53d6Callable\u7684\u8fd4\u56de\u503c
\n System.out.println(a);
\n }
\n}
\nclass MyThread3 implements Callable<Object>{
\n @Override
\n public Object call() throws Exception {
\n String a = "\u6267\u884cCallable\u6210\u529f \u8fd4\u56de\u4e86\u4e00\u4e2aString\u5b57\u7b26\u4e32！";
\n return a;
\n }
\n}<\/p>\n\u7279\u70b9：<\/p>\n<\/p>\n
- \n
- \u652f\u6301\u8fd4\u56de\u6267\u884c\u7ed3\u679c，\u53ef\u629b\u51fa\u5f02\u5e38，\u9002\u7528\u4e8e\u9700\u8981\u7ebf\u7a0b\u6267\u884c\u7ed3\u679c\u7684\u573a\u666f（\u5982\u5e76\u884c\u8ba1\u7b97）\u3002<\/li>\n<\/ul>\n
\u6838\u5fc3\u533a\u522b\u603b\u7ed3<\/p>\n
\n
\u65b9\u5f0f\u5b9e\u73b0\u590d\u6742\u5ea6\u662f\u5426\u6709\u8fd4\u56de\u503c\u7075\u6d3b\u6027\u9002\u7528\u573a\u666f<\/tr>\n \n\n \u7ee7\u627fThread<\/td>\n \u7b80\u5355<\/td>\n \u65e0<\/td>\n \u4f4e（\u5355\u7ee7\u627f）<\/td>\n \u7b80\u5355\u7ebf\u7a0b\u4efb\u52a1<\/td>\n<\/tr>\n \n \u5b9e\u73b0Runnable<\/td>\n \u4e2d\u7b49<\/td>\n \u65e0<\/td>\n \u9ad8<\/td>\n \u591a\u7ebf\u7a0b\u5171\u4eab\u8d44\u6e90\u6216\u9700\u591a\u5b9e\u73b0<\/td>\n<\/tr>\n \n \u5b9e\u73b0Callable<\/td>\n \u8f83\u9ad8<\/td>\n \u6709<\/td>\n \u9ad8<\/td>\n \u9700\u8981\u7ebf\u7a0b\u6267\u884c\u7ed3\u679c\u6216\u5f02\u5e38\u5904\u7406<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n \u5b9e\u9645\u5f00\u53d1\u4e2d，Runnable\u548cCallable\u56e0\u7075\u6d3b\u6027\u66f4\u5e38\u7528，\u5c24\u5176\u662f\u914d\u5408\u7ebf\u7a0b\u6c60\u4f7f\u7528\u65f6\u3002<\/p>\n
4.\u7ebf\u7a0b\u6c60<\/h4>\n
\u5728 Java \u4e2d，\u7ebf\u7a0b\u6c60\u662f\u7ba1\u7406\u7ebf\u7a0b\u751f\u547d\u5468\u671f\u7684\u91cd\u8981\u673a\u5236，\u80fd\u591f\u6709\u6548\u907f\u514d\u9891\u7e41\u521b\u5efa \/ \u9500\u6bc1\u7ebf\u7a0b\u7684\u6027\u80fd\u5f00\u9500\u3002\u4f60\u63d0\u5230\u7684\u5e94\u8be5\u662fThreadPoolExecutor（\u6838\u5fc3\u5b9e\u73b0\u7c7b）\u548cExecutors（\u5de5\u5177\u7c7b），\u4e0b\u9762\u8be6\u7ec6\u4ecb\u7ecd：<\/p>\n
4.1 \u6838\u5fc3\u5b9e\u73b0\u7c7b：ThreadPoolExecutor<\/h5>\n
ThreadPoolExecutor\u662f\u7ebf\u7a0b\u6c60\u7684\u6838\u5fc3\u5b9e\u73b0\u7c7b，\u4f4d\u4e8ejava.util.concurrent\u5305\u4e0b，\u901a\u8fc7\u7075\u6d3b\u914d\u7f6e\u53c2\u6570\u53ef\u6ee1\u8db3\u4e0d\u540c\u573a\u666f\u9700\u6c42\u3002<\/p>\n
\u6838\u5fc3\u6784\u9020\u53c2\u6570<\/h5>\n
public ThreadPoolExecutor(
\n int corePoolSize, \/\/ \u6838\u5fc3\u7ebf\u7a0b\u6570（\u59cb\u7ec8\u5b58\u6d3b\u7684\u7ebf\u7a0b\u6570）
\n int maximumPoolSize, \/\/ \u6700\u5927\u7ebf\u7a0b\u6570（\u7ebf\u7a0b\u6c60\u5141\u8bb8\u7684\u6700\u5927\u7ebf\u7a0b\u6570）
\n long keepAliveTime, \/\/ \u975e\u6838\u5fc3\u7ebf\u7a0b\u7a7a\u95f2\u8d85\u65f6\u65f6\u95f4
\n TimeUnit unit, \/\/ \u8d85\u65f6\u65f6\u95f4\u5355\u4f4d（\u5982TimeUnit.SECONDS）
\n BlockingQueue<Runnable> workQueue, \/\/ \u4efb\u52a1\u7b49\u5f85\u961f\u5217（\u5b58\u653e\u672a\u6267\u884c\u7684\u4efb\u52a1）
\n ThreadFactory threadFactory, \/\/ \u7ebf\u7a0b\u5de5\u5382（\u7528\u4e8e\u521b\u5efa\u7ebf\u7a0b）
\n RejectedExecutionHandler handler \/\/ \u62d2\u7edd\u7b56\u7565（\u4efb\u52a1\u6ee1\u65f6\u7684\u5904\u7406\u65b9\u5f0f）
\n)<\/p>\n\u5e38\u7528\u62d2\u7edd\u7b56\u7565<\/h5>\n
- AbortPolicy（\u9ed8\u8ba4）：\u76f4\u63a5\u629b\u51faRejectedExecutionException\u5f02\u5e38<\/li>\n
- CallerRunsPolicy：\u8ba9\u63d0\u4ea4\u4efb\u52a1\u7684\u7ebf\u7a0b\u81ea\u5df1\u6267\u884c\u4efb\u52a1<\/li>\n
- DiscardPolicy：\u76f4\u63a5\u4e22\u5f03\u4efb\u52a1（\u4e0d\u629b\u5f02\u5e38）<\/li>\n
- DiscardOldestPolicy：\u4e22\u5f03\u961f\u5217\u4e2d\u6700\u65e7\u7684\u4efb\u52a1，\u518d\u5c1d\u8bd5\u63d0\u4ea4\u65b0\u4efb\u52a1<\/li>\n
\u793a\u4f8b\u4ee3\u7801：<\/h5>\n
package com.itheima.ReStudy2;<\/p>\n
import java.util.concurrent.ArrayBlockingQueue;
\nimport java.util.concurrent.Executors;
\nimport java.util.concurrent.ThreadPoolExecutor;
\nimport java.util.concurrent.TimeUnit;<\/p>\npublic class Demo4ThreadPoolExecutor {
\n public static void main(String[] args) {
\n ThreadPoolExecutor executor = new ThreadPoolExecutor(
\n 3,\/\/\u6838\u5fc3\u7ebf\u7a0b\u6570
\n 5, \/\/\u6700\u5927\u7ebf\u7a0b\u6570
\n 10,\/\/\u7ebf\u7a0b\u7a7a\u95f2\u65f6\u95f4
\n TimeUnit.SECONDS,\/\/\u9500\u6bc1\u65f6\u95f4\u5355\u4f4d
\n new ArrayBlockingQueue<>(4),\/\/\u4efb\u52a1\u961f\u5217
\n Executors.defaultThreadFactory(),\/\/\u7ebf\u7a0b\u5de5\u5382
\n new ThreadPoolExecutor.AbortPolicy()\/\/\u62d2\u7edd\u7b56\u7565
\n );
\n for (int i = 0; i < 15; i++) {
\n executor.execute(new MyThread4());
\n System.out.println("\u5f53\u524d\u7ebf\u7a0b\u6570："+executor.getPoolSize());
\n System.out.println("\u5f53\u524d\u6392\u961f\u7ebf\u7a0b\u6570："+executor.getQueue().size());
\n try {
\n Thread.sleep(1000);
\n } catch (InterruptedException e) {
\n e.printStackTrace();
\n }
\n }
\n executor.shutdown();
\n }
\n}
\nclass MyThread4 implements Runnable{
\n public void run()
\n {
\n System.out.println(Thread.currentThread().getName()+"\u6267\u884c\u4e86");
\n }
\n}<\/p>\n4.2 \u5de5\u5177\u7c7b：Executors<\/h5>\n
Executors\u63d0\u4f9b\u4e86\u4fbf\u6377\u7684\u9759\u6001\u65b9\u6cd5，\u53ef\u5feb\u901f\u521b\u5efa\u9884\u914d\u7f6e\u7684\u7ebf\u7a0b\u6c60（\u5e95\u5c42\u4ecd\u57fa\u4e8eThreadPoolExecutor），\u9002\u5408\u7b80\u5355\u573a\u666f\u3002\u4f46\u963f\u91cc\u5df4\u5df4\u5f00\u53d1\u624b\u518c\u4e0d\u63a8\u8350\u4f7f\u7528，\u56e0\u9ed8\u8ba4\u53c2\u6570\u53ef\u80fd\u5bfc\u81f4\u8d44\u6e90\u8017\u5c3d（\u5982\u65e0\u754c\u961f\u5217）\u3002<\/p>\n
\u5e38\u7528\u65b9\u6cd5<\/h5>\n
- \n
Executors.newFixedThreadPool(int nThreads)<\/p>\n
- \n
- \u56fa\u5b9a\u5927\u5c0f\u7684\u7ebf\u7a0b\u6c60（\u6838\u5fc3\u7ebf\u7a0b\u6570 = \u6700\u5927\u7ebf\u7a0b\u6570）<\/li>\n
- \u961f\u5217\u4f7f\u7528LinkedBlockingQueue（\u65e0\u754c，\u53ef\u80fd\u5806\u79ef\u5927\u91cf\u4efb\u52a1\u5bfc\u81f4 OOM<\/li>\n<\/ul>\n<\/li>\n
ExecutorService fixedPool = Executors.newFixedThreadPool(5); \/\/ \u56fa\u5b9a5\u4e2a\u7ebf\u7a0b<\/p>\n
Executors.newCachedThreadPool()<\/p>\n
- \n
- \u53ef\u7f13\u5b58\u7684\u7ebf\u7a0b\u6c60（\u6838\u5fc3\u7ebf\u7a0b\u6570 = 0，\u6700\u5927\u7ebf\u7a0b\u6570 = Integer.MAX_VALUE）<\/li>\n
- \u7a7a\u95f2\u7ebf\u7a0b 60 \u79d2\u540e\u9500\u6bc1，\u9002\u5408\u77ed\u671f\u4efb\u52a1<\/li>\n
- \u98ce\u9669：\u4efb\u52a1\u8fc7\u591a\u65f6\u53ef\u80fd\u521b\u5efa\u5927\u91cf\u7ebf\u7a0b\u5bfc\u81f4 OOM<\/li>\n<\/ul>\n
ExecutorService cachedPool = Executors.newCachedThreadPool();<\/p>\n
Executors.newSingleThreadExecutor()<\/p>\n
- \n
- \u5355\u7ebf\u7a0b\u6c60（\u6838\u5fc3\u7ebf\u7a0b\u6570 = \u6700\u5927\u7ebf\u7a0b\u6570 = 1）<\/li>\n
- \u6240\u6709\u4efb\u52a1\u6309\u987a\u5e8f\u6267\u884c，\u9002\u5408\u9700\u8981\u4e32\u884c\u6267\u884c\u7684\u573a\u666f<\/li>\n<\/ul>\n
ExecutorService singlePool = Executors.newSingleThreadExecutor();<\/p>\n
Executors.newScheduledThreadPool(int corePoolSize)<\/p>\n
- \n
- \u5b9a\u65f6\u4efb\u52a1\u7ebf\u7a0b\u6c60，\u652f\u6301\u5ef6\u8fdf\u6267\u884c\u6216\u5468\u671f\u6027\u6267\u884c<\/li>\n<\/ul>\n
ScheduledExecutorService scheduledPool = Executors.newScheduledThreadPool(3);
\n\/\/ \u5ef6\u8fdf1\u79d2\u540e\u6267\u884c
\nscheduledPool.schedule(() -> System.out.println("\u5ef6\u8fdf\u6267\u884c"), 1, TimeUnit.SECONDS);
\n\/\/ \u5ef6\u8fdf2\u79d2\u540e，\u6bcf3\u79d2\u6267\u884c\u4e00\u6b21
\nscheduledPool.scheduleAtFixedRate(() -> System.out.println("\u5468\u671f\u6267\u884c"), 2, 3, TimeUnit.SECONDS);<\/p>\n4.3 \u7ebf\u7a0b\u6c60\u4f7f\u7528\u6d41\u7a0b<\/h5>\n
- \u521b\u5efa\u7ebf\u7a0b\u6c60（\u63a8\u8350ThreadPoolExecutor\u624b\u52a8\u914d\u7f6e\u53c2\u6570）<\/li>\n
- \u901a\u8fc7submit()\u6216execute()\u63d0\u4ea4\u4efb\u52a1（submit()\u53ef\u8fd4\u56deFuture\u83b7\u53d6\u7ed3\u679c）<\/li>\n
- \u4efb\u52a1\u6267\u884c\u5b8c\u6bd5\u540e，\u8c03\u7528shutdown()（\u5e73\u7f13\u5173\u95ed）\u6216shutdownNow()（\u5f3a\u5236\u5173\u95ed）<\/li>\n
4.4 \u6838\u5fc3\u533a\u522b\u4e0e\u5efa\u8bae<\/h5>\n
\n
\u7c7b\u578b\u4f18\u52bf\u52a3\u52bf\u5efa\u8bae\u573a\u666f<\/tr>\n \n\n ThreadPoolExecutor<\/td>\n \u53c2\u6570\u53ef\u63a7，\u7075\u6d3b\u9002\u914d\u573a\u666f<\/td>\n \u914d\u7f6e\u590d\u6742<\/td>\n \u751f\u4ea7\u73af\u5883，\u9700\u7cbe\u7ec6\u63a7\u5236\u8d44\u6e90<\/td>\n<\/tr>\n \n Executors\u5de5\u5177\u7c7b<\/td>\n \u5feb\u901f\u521b\u5efa，\u4ee3\u7801\u7b80\u6d01<\/td>\n \u9ed8\u8ba4\u53c2\u6570\u6709\u6f5c\u5728\u98ce\u9669（\u5982 OOM）<\/td>\n \u7b80\u5355\u573a\u666f\u6216\u6d4b\u8bd5\u73af\u5883<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n \u6700\u4f73\u5b9e\u8df5：\u751f\u4ea7\u73af\u5883\u4e2d\u63a8\u8350\u76f4\u63a5\u4f7f\u7528ThreadPoolExecutor，\u6839\u636e\u4e1a\u52a1\u9700\u6c42\u5408\u7406\u8bbe\u7f6e\u6838\u5fc3\u7ebf\u7a0b\u6570\u3001\u961f\u5217\u5927\u5c0f\u548c\u62d2\u7edd\u7b56\u7565，\u907f\u514d\u8d44\u6e90\u8017\u5c3d\u98ce\u9669\u3002<\/p>\n
\u4e09. \u591a\u7ebf\u7a0b\u5e76\u53d1\u5b89\u5168\u89e3\u51b3<\/h3>\n
\u5728\u591a\u7ebf\u7a0b\u73af\u5883\u4e2d，\u5f53\u591a\u4e2a\u7ebf\u7a0b\u540c\u65f6\u64cd\u4f5c\u5171\u4eab\u8d44\u6e90\u65f6，\u53ef\u80fd\u4f1a\u5bfc\u81f4\u6570\u636e\u4e0d\u4e00\u81f4\u3001\u903b\u8f91\u9519\u8bef\u7b49\u95ee\u9898，\u8fd9\u5c31\u662f\u5e76\u53d1\u5b89\u5168\u95ee\u9898\u3002<\/p>\n
1. \u5e76\u53d1\u5b89\u5168\u95ee\u9898\u7684\u4ea7\u751f\u6761\u4ef6<\/h5>\n
- \u591a\u7ebf\u7a0b\u73af\u5883：\u5b58\u5728\u591a\u4e2a\u7ebf\u7a0b\u540c\u65f6\u6267\u884c<\/li>\n
- \u5171\u4eab\u8d44\u6e90：\u7ebf\u7a0b\u64cd\u4f5c\u540c\u4e00\u4efd\u53ef\u4fee\u6539\u7684\u8d44\u6e90（\u5982\u5168\u5c40\u53d8\u91cf\u3001\u9759\u6001\u53d8\u91cf\u3001\u5bf9\u8c61\u5c5e\u6027\u7b49）<\/li>\n
- \u975e\u539f\u5b50\u64cd\u4f5c：\u5bf9\u5171\u4eab\u8d44\u6e90\u7684\u64cd\u4f5c\u4e0d\u662f\u4e00\u6b65\u5b8c\u6210\u7684（\u5982i++\u5b9e\u9645\u5305\u542b\u8bfb\u53d6\u3001\u4fee\u6539\u3001\u5199\u5165\u4e09\u6b65）<\/li>\n
\u793a\u4f8b：\u4e0d\u5b89\u5168\u7684\u591a\u7ebf\u7a0b\u64cd\u4f5c<\/p>\n
public class UnsafeThreadDemo {
\n private static int count = 0; \/\/ \u5171\u4eab\u8d44\u6e90<\/p>\npublic static void main(String[] args) throws InterruptedException {
\n \/\/ \u521b\u5efa1000\u4e2a\u7ebf\u7a0b，\u6bcf\u4e2a\u7ebf\u7a0b\u5bf9count\u52a0100\u6b21
\n Runnable task = () -> {
\n for (int i = 0; i < 100; i++) {
\n count++; \/\/ \u975e\u539f\u5b50\u64cd\u4f5c，\u5b58\u5728\u5b89\u5168\u95ee\u9898
\n }
\n };<\/p>\nThread[] threads = new Thread[1000];
\n for (int i = 0; i < 1000; i++) {
\n threads[i] = new Thread(task);
\n threads[i].start();
\n }<\/p>\n\/\/ \u7b49\u5f85\u6240\u6709\u7ebf\u7a0b\u6267\u884c\u5b8c\u6bd5
\n for (int i = 0; i < 1000; i++) {
\n threads[i].join();
\n }<\/p>\nSystem.out.println("\u6700\u7ec8\u7ed3\u679c：" + count); \/\/ \u9884\u671f100000，\u5b9e\u9645\u5f80\u5f80\u5c0f\u4e8e\u8be5\u503c
\n }
\n}<\/p>\n<\/p>\n\u95ee\u9898\u539f\u56e0：\u591a\u4e2a\u7ebf\u7a0b\u540c\u65f6\u8bfb\u53d6count\u7684\u503c，\u4fee\u6539\u540e\u518d\u5199\u56de（\u7531\u4e8e\u7ebf\u7a0b\u6267\u884c\u5e76\u53d1\u673a\u5236），\u5bfc\u81f4\u90e8\u5206\u589e\u91cf\u64cd\u4f5c\u88ab\u8986\u76d6\u3002<\/p>\n
\u4e8c\u3001\u5e76\u53d1\u5b89\u5168\u95ee\u9898\u7684\u89e3\u51b3\u65b9\u6848<\/h5>\n
1. \u540c\u6b65\u9501（synchronized\u4ee3\u7801\u5757）<\/h6>\n
\u901a\u8fc7\u00a0synchronized\u5173\u952e\u5b57\u9501\u5b9a\u5171\u4eab\u8d44\u6e90，\u786e\u4fdd\u540c\u4e00\u65f6\u95f4\u53ea\u6709\u4e00\u4e2a\u7ebf\u7a0b\u80fd\u6267\u884c\u4e34\u754c\u533a\u4ee3\u7801\u3002<\/p>\n<\/p>\n
\u8bed\u6cd5：<\/p>\n
synchronized (\u9501\u5bf9\u8c61) { \/\/ \u64cd\u4f5c\u5171\u4eab\u8d44\u6e90\u7684\u4ee3\u7801（\u4e34\u754c\u533a） }<\/p>\n
\u793a\u4f8b：<\/p>\n
public class SynchronizedBlockDemo {
\n private static int count = 0;
\n private static final Object lock = new Object(); \/\/ \u9501\u5bf9\u8c61（\u63a8\u8350\u4f7f\u7528\u4e13\u7528\u5bf9\u8c61）<\/p>\npublic static void main(String[] args) throws InterruptedException {
\n Runnable task = () -> {
\n for (int i = 0; i < 100; i++) {
\n synchronized (lock) { \/\/ \u9501\u5b9a\u4e34\u754c\u533a
\n count++;
\n }
\n }
\n };<\/p>\n\/\/ \u542f\u52a8\u7ebf\u7a0b\u903b\u8f91\u540c\u4e0a…
\n Thread[] threads = new Thread[1000];
\n for (int i = 0; i < 1000; i++) {
\n threads[i] = new Thread(task);
\n threads[i].start();
\n }<\/p>\nfor (int i = 0; i < 1000; i++) {
\n threads[i].join();
\n }<\/p>\nSystem.out.println("\u6700\u7ec8\u7ed3\u679c：" + count); \/\/ \u6b63\u786e\u8f93\u51fa100000
\n }
\n}<\/p>\n\u7279\u70b9：<\/p>\n<\/p>\n
- \n
- \u9501\u5bf9\u8c61\u53ef\u4ee5\u662f\u4efb\u610f\u5bf9\u8c61，\u4f46\u591a\u4e2a\u7ebf\u7a0b\u5fc5\u987b\u4f7f\u7528\u540c\u4e00\u4e2a\u9501\u5bf9\u8c61\u624d\u80fd\u4fdd\u8bc1\u540c\u6b65<\/li>\n
- \u63a8\u8350\u4f7f\u7528private static final Object\u4f5c\u4e3a\u9501\u5bf9\u8c61，\u907f\u514d\u9501\u5bf9\u8c61\u88ab\u4fee\u6539<\/li>\n<\/ul>\n
2. \u540c\u6b65\u65b9\u6cd5（synchronized\u65b9\u6cd5）<\/h6>\n
\u5c06\u00a0synchronized\u5173\u952e\u5b57\u4fee\u9970\u5728\u65b9\u6cd5\u4e0a，\u6b64\u65f6\u9501\u5bf9\u8c61\u4e3a：<\/p>\n<\/p>\n
- \n
- \u975e\u9759\u6001\u65b9\u6cd5：\u5f53\u524d\u5bf9\u8c61（this）<\/li>\n
- \u9759\u6001\u65b9\u6cd5：\u5f53\u524d\u7c7b\u7684Class\u5bf9\u8c61<\/li>\n<\/ul>\n
\u793a\u4f8b：<\/p>\n
public class SynchronizedMethodDemo {
\n private static int count = 0;<\/p>\n\/\/ \u9759\u6001\u540c\u6b65\u65b9\u6cd5（\u9501\u5bf9\u8c61\u4e3aSynchronizedMethodDemo.class）
\n private static synchronized void increment() {
\n count++;
\n }<\/p>\npublic static void main(String[] args) throws InterruptedException {
\n Runnable task = () -> {
\n for (int i = 0; i < 100; i++) {
\n increment(); \/\/ \u8c03\u7528\u540c\u6b65\u65b9\u6cd5
\n }
\n };<\/p>\n\/\/ \u542f\u52a8\u7ebf\u7a0b\u903b\u8f91\u540c\u4e0a…
\n Thread[] threads = new Thread[1000];
\n for (int i = 0; i < 1000; i++) {
\n threads[i] = new Thread(task);
\n threads[i].start();
\n }<\/p>\nfor (int i = 0; i < 1000; i++) {
\n threads[i].join();
\n }<\/p>\nSystem.out.println("\u6700\u7ec8\u7ed3\u679c：" + count); \/\/ \u6b63\u786e\u8f93\u51fa100000
\n }
\n}<\/p>\n<\/p>\nLock\u76f8\u6bd4synchronized\u7684\u4f18\u52bf：<\/p>\n<\/p>\n
- \n
- \u53ef\u4e2d\u65ad\u9501：\u652f\u6301tryLock(long time, TimeUnit unit)\u8d85\u65f6\u83b7\u53d6\u9501，\u907f\u514d\u6b7b\u9501<\/li>\n
- \u53ef\u5c1d\u8bd5\u83b7\u53d6\u9501：tryLock()\u65b9\u6cd5\u5c1d\u8bd5\u83b7\u53d6\u9501，\u5931\u8d25\u5219\u7acb\u5373\u8fd4\u56de<\/li>\n
- \u516c\u5e73\u9501：ReentrantLock\u53ef\u901a\u8fc7\u6784\u9020\u53c2\u6570new ReentrantLock(true)\u5b9e\u73b0\u516c\u5e73\u9501（\u6309\u8bf7\u6c42\u987a\u5e8f\u83b7\u53d6\u9501）<\/li>\n
- \u53ef\u5206\u79bb\u9501：\u914d\u5408Condition\u5b9e\u73b0\u66f4\u7075\u6d3b\u7684\u7ebf\u7a0b\u901a\u4fe1<\/li>\n<\/ul>\n
3.\u4e09\u79cd\u65b9\u6848\u7684\u5bf9\u6bd4<\/h6>\n
\n
\u65b9\u6848\u5b9e\u73b0\u65b9\u5f0f\u7075\u6d3b\u6027\u6027\u80fd（\u4e00\u822c\u573a\u666f）\u9002\u7528\u573a\u666f<\/tr>\n \n\n \u540c\u6b65\u4ee3\u7801\u5757<\/td>\n synchronized(\u9501)<\/td>\n \u4e2d\u7b49<\/td>\n \u8f83\u597d<\/td>\n \u9700\u9501\u5b9a\u4ee3\u7801\u7247\u6bb5\u65f6<\/td>\n<\/tr>\n \n \u540c\u6b65\u65b9\u6cd5<\/td>\n synchronized\u4fee\u9970\u65b9\u6cd5<\/td>\n \u4f4e（\u7c92\u5ea6\u7c97）<\/td>\n \u4e00\u822c<\/td>\n \u7b80\u5355\u573a\u666f，\u6574\u4e2a\u65b9\u6cd5\u9700\u540c\u6b65\u65f6<\/td>\n<\/tr>\n \n Lock\u9501<\/td>\n \u663e\u5f0flock()\/unlock()<\/td>\n \u9ad8<\/td>\n \u8f83\u597d（\u7ade\u4e89\u6fc0\u70c8\u65f6\u66f4\u4f18）<\/td>\n \u590d\u6742\u573a\u666f（\u8d85\u65f6\u3001\u516c\u5e73\u9501\u7b49）<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n \u6700\u4f73\u5b9e\u8df5：<\/p>\n<\/p>\n
- \n
- \u7b80\u5355\u573a\u666f\u4f18\u5148\u4f7f\u7528synchronized（\u4ee3\u7801\u7b80\u6d01，JVM \u4f18\u5316\u66f4\u597d）<\/li>\n
- \u590d\u6742\u573a\u666f（\u5982\u9700\u8981\u8d85\u65f6\u63a7\u5236\u3001\u516c\u5e73\u9501）\u4f7f\u7528Lock<\/li>\n
- \u5c3d\u91cf\u7f29\u5c0f\u540c\u6b65\u8303\u56f4（\u53ea\u9501\u5fc5\u8981\u7684\u4ee3\u7801），\u51cf\u5c11\u7ebf\u7a0b\u963b\u585e\u65f6\u95f4<\/li>\n<\/ul>\n","protected":false},"excerpt":{"rendered":"
\u6587\u7ae0\u6d4f\u89c8\u9605\u8bfb124\u6b21\uff0c\u70b9\u8d5e9\u6b21\uff0c\u6536\u85cf2\u6b21\u3002\u7ebf\u7a0b\uff08Thread\uff09\u662f\u64cd\u4f5c\u7cfb\u7edf\u80fd\u591f\u8fdb\u884c\uff0c\u5b83\u88ab\u5305\u542b\u5728\u8fdb\u7a0b\u4e4b\u4e2d\uff0c\u662f\u8fdb\u7a0b\u4e2d\u7684\u5b9e\u9645\u8fd0\u4f5c\u5355\u4f4d\u3002\u4e00\u4e2a\u8fdb\u7a0b\u53ef\u4ee5\u5305\u542b\u591a\u4e2a\u7ebf\u7a0b\uff0c\u8fd9\u4e9b\u7ebf\u7a0b\u5171\u4eab\u8be5\u8fdb\u7a0b\u7684\u8d44\u6e90\uff08\u5982\u5185\u5b58\u7a7a\u95f4\u3001\u6587\u4ef6\u63cf\u8ff0\u7b26\u7b49\uff09\uff0c\u4f46\u540c\u65f6\u62e5\u6709\u5404\u81ea\u72ec\u7acb\u7684\u6267\u884c\u6808\u3001\u7a0b\u5e8f\u8ba1\u6570\u5668\u548c\u5bc4\u5b58\u5668\u96c6\u5408\u3002<\/p>\n","protected":false},"author":2,"featured_media":52895,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[99,190],"topic":[],"class_list":["post-52897","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-server","tag-java","tag-190"],"yoast_head":"\n
Java\u8fdb\u9636\u6280\u672f3-\u591a\u7ebf\u7a0b - \u7f51\u7855\u4e92\u8054\u5e2e\u52a9\u4e2d\u5fc3<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.wsisp.com\/helps\/52897.html\" \/>\n<meta property=\"og:locale\" content=\"zh_CN\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Java\u8fdb\u9636\u6280\u672f3-\u591a\u7ebf\u7a0b - \u7f51\u7855\u4e92\u8054\u5e2e\u52a9\u4e2d\u5fc3\" \/>\n<meta property=\"og:description\" content=\"\u6587\u7ae0\u6d4f\u89c8\u9605\u8bfb124\u6b21\uff0c\u70b9\u8d5e9\u6b21\uff0c\u6536\u85cf2\u6b21\u3002\u7ebf\u7a0b\uff08Thread\uff09\u662f\u64cd\u4f5c\u7cfb\u7edf\u80fd\u591f\u8fdb\u884c\uff0c\u5b83\u88ab\u5305\u542b\u5728\u8fdb\u7a0b\u4e4b\u4e2d\uff0c\u662f\u8fdb\u7a0b\u4e2d\u7684\u5b9e\u9645\u8fd0\u4f5c\u5355\u4f4d\u3002\u4e00\u4e2a\u8fdb\u7a0b\u53ef\u4ee5\u5305\u542b\u591a\u4e2a\u7ebf\u7a0b\uff0c\u8fd9\u4e9b\u7ebf\u7a0b\u5171\u4eab\u8be5\u8fdb\u7a0b\u7684\u8d44\u6e90\uff08\u5982\u5185\u5b58\u7a7a\u95f4\u3001\u6587\u4ef6\u63cf\u8ff0\u7b26\u7b49\uff09\uff0c\u4f46\u540c\u65f6\u62e5\u6709\u5404\u81ea\u72ec\u7acb\u7684\u6267\u884c\u6808\u3001\u7a0b\u5e8f\u8ba1\u6570\u5668\u548c\u5bc4\u5b58\u5668\u96c6\u5408\u3002\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.wsisp.com\/helps\/52897.html\" \/>\n<meta property=\"og:site_name\" content=\"\u7f51\u7855\u4e92\u8054\u5e2e\u52a9\u4e2d\u5fc3\" \/>\n<meta property=\"article:published_time\" content=\"2025-08-11T13:14:22+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2025\/08\/20250811131421-6899ecadb2d4a.png\" \/>\n<meta name=\"author\" content=\"admin\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" 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=\"5 \u5206\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"WebPage\",\"@id\":\"https:\/\/www.wsisp.com\/helps\/52897.html\",\"url\":\"https:\/\/www.wsisp.com\/helps\/52897.html\",\"name\":\"Java\u8fdb\u9636\u6280\u672f3-\u591a\u7ebf\u7a0b - 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