\u5f53\u4e24\u4e2a\u6216\u4e24\u4e2a\u4ee5\u4e0a\u7684\u7ebf\u7a0b\u9700\u8981\u5171\u4eab\u8d44\u6e90\uff0c\u5b83\u4eec\u9700\u8981\u67d0\u79cd\u65b9\u6cd5\u6765\u786e\u5b9a\u8d44\u6e90\u5728\u67d0\u4e00\u523b\u4ec5\u88ab\u4e00\u4e2a\u7ebf\u7a0b\u5360\u7528\u3002\u8fbe\u5230\u6b64\u76ee\u7684\u7684\u8fc7\u7a0b\u53eb\u505a\u540c\u6b65\uff08synchronization\uff09\u3002\u50cf\u4f60\u6240\u770b\u5230\u7684\uff0cJava\u4e3a\u6b64\u63d0\u4f9b\u4e86\u72ec\u7279\u7684\uff0c\u8bed\u8a00\u6c34\u5e73\u4e0a\u7684\u652f\u6301\u3002
\n<\/p>\n
\u540c\u6b65\u7684\u5173\u952e\u662f\u7ba1\u7a0b\uff08\u4e5f\u53eb\u4fe1\u53f7\u91cfsemaphore\uff09\u7684\u6982\u5ff5\u3002\u7ba1\u7a0b\u662f\u4e00\u4e2a\u4e92\u65a5\u72ec\u5360\u9501\u5b9a\u7684\u5bf9\u8c61\uff0c\u6216\u79f0\u4e92\u65a5\u4f53\uff08mutex\uff09\u3002\u5728\u7ed9\u5b9a\u7684\u65f6\u95f4\uff0c\u4ec5\u6709\u4e00\u4e2a\u7ebf\u7a0b\u53ef\u4ee5\u83b7\u5f97\u7ba1\u7a0b\u3002\u5f53\u4e00\u4e2a\u7ebf\u7a0b\u9700\u8981\u9501\u5b9a\uff0c\u5b83\u5fc5\u987b\u8fdb\u5165\u7ba1\u7a0b\u3002\u6240\u6709\u5176\u4ed6\u7684\u8bd5\u56fe\u8fdb\u5165\u5df2\u7ecf\u9501\u5b9a\u7684\u7ba1\u7a0b\u7684\u7ebf\u7a0b\u5fc5\u987b\u6302\u8d77\u76f4\u5230\u7b2c\u4e00\u4e2a\u7ebf\u7a0b\u9000\u51fa\u7ba1\u7a0b\u3002\u8fd9\u4e9b\u5176\u4ed6\u7684\u7ebf\u7a0b\u88ab\u79f0\u4e3a\u7b49\u5f85\u7ba1\u7a0b\u3002\u4e00\u4e2a\u62e5\u6709\u7ba1\u7a0b\u7684\u7ebf\u7a0b\u5982\u679c\u613f\u610f\u7684\u8bdd\u53ef\u4ee5\u518d\u6b21\u8fdb\u5165\u76f8\u540c\u7684\u7ba1\u7a0b\u3002<\/p>\n
\u5982\u679c\u4f60\u7528\u5176\u4ed6\u8bed\u8a00\u4f8b\u5982C\u6216C++\u65f6\u7528\u5230\u8fc7\u540c\u6b65\uff0c\u4f60\u4f1a\u77e5\u9053\u5b83\u7528\u8d77\u6765\u6709\u4e00\u70b9\u8be1\u5f02\u3002\u8fd9\u662f\u56e0\u4e3a\u5f88\u591a\u8bed\u8a00\u5b83\u4eec\u81ea\u5df1\u4e0d\u652f\u6301\u540c\u6b65\u3002\u76f8\u53cd\uff0c\u5bf9\u540c\u6b65\u7ebf\u7a0b\uff0c\u7a0b\u5e8f\u5fc5\u987b\u5229\u7528\u64cd\u4f5c\u7cfb\u7edf\u6e90\u8bed\u3002\u5e78\u8fd0\u7684\u662fJava\u901a\u8fc7\u8bed\u8a00\u5143\u7d20\u5b9e\u73b0\u540c\u6b65\uff0c\u5927\u591a\u6570\u7684\u4e0e\u540c\u6b65\u76f8\u5173\u7684\u590d\u6742\u6027\u90fd\u88ab\u6d88\u9664\u3002<\/p>\n
\u4f60\u53ef\u4ee5\u7528\u4e24\u79cd\u65b9\u6cd5\u540c\u6b65\u5316\u4ee3\u7801\u3002\u4e24\u8005\u90fd\u5305\u62ecsynchronized\u5173\u952e\u5b57\u7684\u8fd0\u7528\uff0c\u4e0b\u9762\u5206\u522b\u8bf4\u660e\u8fd9\u4e24\u79cd\u65b9\u6cd5\u3002
\n\u4f7f\u7528\u540c\u6b65\u65b9\u6cd5<\/p>\n
Java\u4e2d\u540c\u6b65\u662f\u7b80\u5355\u7684\uff0c\u56e0\u4e3a\u6240\u6709\u5bf9\u8c61\u90fd\u6709\u5b83\u4eec\u4e0e\u4e4b\u5bf9\u5e94\u7684\u9690\u5f0f\u7ba1\u7a0b\u3002\u8fdb\u5165\u67d0\u4e00\u5bf9\u8c61\u7684\u7ba1\u7a0b\uff0c\u5c31\u662f\u8c03\u7528\u88absynchronized\u5173\u952e\u5b57\u4fee\u9970\u7684\u65b9\u6cd5\u3002\u5f53\u4e00\u4e2a\u7ebf\u7a0b\u5728\u4e00\u4e2a\u540c\u6b65\u65b9\u6cd5\u5185\u90e8\uff0c\u6240\u6709\u8bd5\u56fe\u8c03\u7528\u8be5\u65b9\u6cd5\uff08\u6216\u5176\u4ed6\u540c\u6b65\u65b9\u6cd5\uff09\u7684\u540c\u5b9e\u4f8b\u7684\u5176\u4ed6\u7ebf\u7a0b\u5fc5\u987b\u7b49\u5f85\u3002\u4e3a\u4e86\u9000\u51fa\u7ba1\u7a0b\uff0c\u5e76\u653e\u5f03\u5bf9\u5bf9\u8c61\u7684\u63a7\u5236\u6743\u7ed9\u5176\u4ed6\u7b49\u5f85\u7684\u7ebf\u7a0b\uff0c\u62e5\u6709\u7ba1\u7a0b\u7684\u7ebf\u7a0b\u4ec5\u9700\u4ece\u540c\u6b65\u65b9\u6cd5\u4e2d\u8fd4\u56de\u3002<\/p>\n
\u4e3a\u7406\u89e3\u540c\u6b65\u7684\u5fc5\u8981\u6027\uff0c\u8ba9\u6211\u4eec\u4ece\u4e00\u4e2a\u5e94\u8be5\u4f7f\u7528\u540c\u6b65\u5374\u6ca1\u6709\u7528\u7684\u7b80\u5355\u4f8b\u5b50\u5f00\u59cb\u3002\u4e0b\u9762\u7684\u7a0b\u5e8f\u6709\u4e09\u4e2a\u7b80\u5355\u7c7b\u3002\u9996\u5148\u662fCallme\uff0c\u5b83\u6709\u4e00\u4e2a\u7b80\u5355\u7684\u65b9\u6cd5call( )\u3002call( )\u65b9\u6cd5\u6709\u4e00\u4e2a\u540d\u4e3amsg\u7684String\u53c2\u6570\u3002\u8be5\u65b9\u6cd5\u8bd5\u56fe\u5728\u65b9\u62ec\u53f7\u5185\u6253\u5370msg \u5b57\u7b26\u4e32\u3002\u6709\u8da3\u7684\u4e8b\u662f\u5728\u8c03\u7528call( ) \u6253\u5370\u5de6\u62ec\u53f7\u548cmsg\u5b57\u7b26\u4e32\u540e\uff0c\u8c03\u7528Thread.sleep(1000)\uff0c\u8be5\u65b9\u6cd5\u4f7f\u5f53\u524d\u7ebf\u7a0b\u6682\u505c1\u79d2\u3002<\/p>\n
\u4e0b\u4e00\u4e2a\u7c7b\u7684\u6784\u9020\u51fd\u6570Caller\uff0c\u5f15\u7528\u4e86Callme\u7684\u4e00\u4e2a\u5b9e\u4f8b\u4ee5\u53ca\u4e00\u4e2aString\uff0c\u5b83\u4eec\u88ab\u5206\u522b\u5b58\u5728target \u548c msg \u4e2d\u3002\u6784\u9020\u51fd\u6570\u4e5f\u521b\u5efa\u4e86\u4e00\u4e2a\u8c03\u7528\u8be5\u5bf9\u8c61\u7684run( )\u65b9\u6cd5\u7684\u65b0\u7ebf\u7a0b\u3002\u8be5\u7ebf\u7a0b\u7acb\u5373\u542f\u52a8\u3002Caller\u7c7b\u7684run( )\u65b9\u6cd5\u901a\u8fc7\u53c2\u6570msg\u5b57\u7b26\u4e32\u8c03\u7528Callme\u5b9e\u4f8btarget\u7684call( ) \u65b9\u6cd5\u3002\u6700\u540e\uff0cSynch\u7c7b\u7531\u521b\u5efaCallme\u7684\u4e00\u4e2a\u7b80\u5355\u5b9e\u4f8b\u548cCaller\u7684\u4e09\u4e2a\u5177\u6709\u4e0d\u540c\u6d88\u606f\u5b57\u7b26\u4e32\u7684\u5b9e\u4f8b\u5f00\u59cb\u3002<\/p>\n
Callme\u7684\u540c\u4e00\u5b9e\u4f8b\u4f20\u7ed9\u6bcf\u4e2aCaller\u5b9e\u4f8b\u3002
\n[java]\/\/ This program is not synchronized.
\nclass Callme {
\n\u00a0\u00a0\u00a0 void call(String msg) {
\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 System.out.print("[" + msg);
\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 try {
\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 Thread.sleep(1000);
\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 } catch(InterruptedException e) {
\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 System.out.println("Interrupted");
\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 }
\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 System.out.println("]");
\n\u00a0\u00a0\u00a0 }
\n}<\/p>\n
class Caller implements Runnable {
\n\u00a0\u00a0\u00a0 String msg;
\n\u00a0\u00a0\u00a0 Callme target;
\n\u00a0\u00a0\u00a0 Thread t;
\n\u00a0\u00a0\u00a0 public Caller(Callme targ, String s) {
\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 target = targ;
\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 msg = s;
\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 t = new Thread(this);
\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 t.start();
\n\u00a0\u00a0\u00a0 }
\n\u00a0\u00a0\u00a0 public void run() {
\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 target.call(msg);
\n\u00a0\u00a0\u00a0 }
\n}<\/p>\n
class Synch {
\n\u00a0\u00a0\u00a0 public static void main(String args[]) {
\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 Callme target = new Callme();
\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 Caller ob1 = new Caller(target, "Hello");
\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 Caller ob2 = new Caller(target, "Synchronized");
\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 Caller ob3 = new Caller(target, "World");
\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 \/\/ wait for threads to end
\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 try {
\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 ob1.t.join();
\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 ob2.t.join();
\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 ob3.t.join();
\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 } catch(InterruptedException e) {
\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 System.out.println("Interrupted");
\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 }
\n\u00a0\u00a0\u00a0 }
\n}<\/p>\n
\u8be5\u7a0b\u5e8f\u7684\u8f93\u51fa\u5982\u4e0b\uff1a
\nHello[Synchronized[World]
\n]
\n][\/java]<\/p>\n
\u5728\u672c\u4f8b\u4e2d\uff0c\u901a\u8fc7\u8c03\u7528sleep( )\uff0ccall( )\u65b9\u6cd5\u5141\u8bb8\u6267\u884c\u8f6c\u6362\u5230\u53e6\u4e00\u4e2a\u7ebf\u7a0b\u3002\u8be5\u7ed3\u679c\u662f\u4e09\u4e2a\u6d88\u606f\u5b57\u7b26\u4e32\u7684\u6df7\u5408\u8f93\u51fa\u3002\u8be5\u7a0b\u5e8f\u4e2d\uff0c\u6ca1\u6709\u963b\u6b62\u4e09\u4e2a\u7ebf\u7a0b\u540c\u65f6\u8c03\u7528\u540c\u4e00\u5bf9\u8c61\u7684\u540c\u4e00\u65b9\u6cd5\u7684\u65b9\u6cd5\u5b58\u5728\u3002\u8fd9\u662f\u4e00\u79cd\u7ade\u4e89\uff0c\u56e0\u4e3a\u4e09\u4e2a\u7ebf\u7a0b\u4e89\u7740\u5b8c\u6210\u65b9\u6cd5\u3002\u4f8b\u9898\u7528sleep( )\u4f7f\u8be5\u5f71\u54cd\u91cd\u590d\u548c\u660e\u663e\u3002\u5728\u5927\u591a\u6570\u60c5\u51b5\uff0c\u7ade\u4e89\u662f\u66f4\u4e3a\u590d\u6742\u548c\u4e0d\u53ef\u9884\u77e5\u7684\uff0c\u56e0\u4e3a\u4f60\u4e0d\u80fd\u786e\u5b9a\u4f55\u65f6\u4e0a\u4e0b\u6587\u8f6c\u6362\u4f1a\u53d1\u751f\u3002\u8fd9\u4f7f\u7a0b\u5e8f\u65f6\u800c\u8fd0\u884c\u6b63\u5e38\u65f6\u800c\u51fa\u9519\u3002<\/p>\n
\u4e3a\u8fbe\u5230\u4e0a\u4f8b\u6240\u60f3\u8fbe\u5230\u7684\u76ee\u7684\uff0c\u5fc5\u987b\u6709\u6743\u8fde\u7eed\u7684\u4f7f\u7528call( )\u3002\u4e5f\u5c31\u662f\u8bf4\uff0c\u5728\u67d0\u4e00\u65f6\u523b\uff0c\u5fc5\u987b\u9650\u5236\u53ea\u6709\u4e00\u4e2a\u7ebf\u7a0b\u53ef\u4ee5\u652f\u914d\u5b83\u3002\u4e3a\u6b64\uff0c\u4f60\u53ea\u9700\u5728call( ) \u5b9a\u4e49\u524d\u52a0\u4e0a\u5173\u952e\u5b57synchronized\uff0c\u5982\u4e0b\uff1a
\nclass Callme {
\n\u00a0\u00a0\u00a0 synchronized void call(String msg) {
\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 …<\/p>\n
\u8fd9\u9632\u6b62\u4e86\u5728\u4e00\u4e2a\u7ebf\u7a0b\u4f7f\u7528call( )\u65f6\u5176\u4ed6\u7ebf\u7a0b\u8fdb\u5165call( )\u3002\u5728synchronized\u52a0\u5230call( )\u524d\u9762\u4ee5\u540e\uff0c\u7a0b\u5e8f\u8f93\u51fa\u5982\u4e0b\uff1a
\n[Hello]
\n[Synchronized]
\n[World]<\/p>\n
\u4efb\u4f55\u65f6\u5019\u5728\u591a\u7ebf\u7a0b\u60c5\u51b5\u4e0b\uff0c\u4f60\u6709\u4e00\u4e2a\u65b9\u6cd5\u6216\u591a\u4e2a\u65b9\u6cd5\u64cd\u7eb5\u5bf9\u8c61\u7684\u5185\u90e8\u72b6\u6001\uff0c\u90fd\u5fc5\u987b\u7528synchronized \u5173\u952e\u5b57\u6765\u9632\u6b62\u72b6\u6001\u51fa\u73b0\u7ade\u4e89\u3002\u8bb0\u4f4f\uff0c\u4e00\u65e6\u7ebf\u7a0b\u8fdb\u5165\u5b9e\u4f8b\u7684\u540c\u6b65\u65b9\u6cd5\uff0c\u6ca1\u6709\u5176\u4ed6\u7ebf\u7a0b\u53ef\u4ee5\u8fdb\u5165\u76f8\u540c\u5b9e\u4f8b\u7684\u540c\u6b65\u65b9\u6cd5\u3002\u7136\u800c\uff0c\u8be5\u5b9e\u4f8b\u7684\u5176\u4ed6\u4e0d\u540c\u6b65\u65b9\u6cd5\u5374\u4ecd\u7136\u53ef\u4ee5\u88ab\u8c03\u7528\u3002
\n\u540c\u6b65\u8bed\u53e5<\/p>\n
\u5c3d\u7ba1\u5728\u521b\u5efa\u7684\u7c7b\u7684\u5185\u90e8\u521b\u5efa\u540c\u6b65\u65b9\u6cd5\u662f\u83b7\u5f97\u540c\u6b65\u7684\u7b80\u5355\u548c\u6709\u6548\u7684\u65b9\u6cd5\uff0c\u4f46\u5b83\u5e76\u975e\u5728\u4efb\u4f55\u65f6\u5019\u90fd\u6709\u6548\u3002\u8fd9\u5176\u4e2d\u7684\u539f\u56e0\uff0c\u8bf7\u8ddf\u7740\u601d\u8003\u3002\u5047\u8bbe\u4f60\u60f3\u83b7\u5f97\u4e0d\u4e3a\u591a\u7ebf\u7a0b\u8bbf\u95ee\u8bbe\u8ba1\u7684\u7c7b\u5bf9\u8c61\u7684\u540c\u6b65\u8bbf\u95ee\uff0c\u4e5f\u5c31\u662f\uff0c\u8be5\u7c7b\u6ca1\u6709\u7528\u5230synchronized\u65b9\u6cd5\u3002\u800c\u4e14\uff0c\u8be5\u7c7b\u4e0d\u662f\u4f60\u81ea\u5df1\uff0c\u800c\u662f\u7b2c\u4e09\u65b9\u521b\u5efa\u7684\uff0c\u4f60\u4e0d\u80fd\u83b7\u5f97\u5b83\u7684\u6e90\u4ee3\u7801\u3002\u8fd9\u6837\uff0c\u4f60\u4e0d\u80fd\u5728\u76f8\u5173\u65b9\u6cd5\u524d\u52a0synchronized\u4fee\u9970\u7b26\u3002\u600e\u6837\u624d\u80fd\u4f7f\u8be5\u7c7b\u7684\u4e00\u4e2a\u5bf9\u8c61\u540c\u6b65\u5316\u5462\uff1f\u5f88\u5e78\u8fd0\uff0c\u89e3\u51b3\u65b9\u6cd5\u5f88\u7b80\u5355\uff1a\u4f60\u53ea\u9700\u5c06\u5bf9\u8fd9\u4e2a\u7c7b\u5b9a\u4e49\u7684\u65b9\u6cd5\u7684\u8c03\u7528\u653e\u5165\u4e00\u4e2asynchronized\u5757\u5185\u5c31\u53ef\u4ee5\u4e86\u3002<\/p>\n
\u4e0b\u9762\u662fsynchronized\u8bed\u53e5\u7684\u666e\u901a\u5f62\u5f0f\uff1a
\nsynchronized(object) {
\n\u00a0\u00a0\u00a0 \/\/ statements to be synchronized
\n}<\/p>\n
\u5176\u4e2d\uff0cobject\u662f\u88ab\u540c\u6b65\u5bf9\u8c61\u7684\u5f15\u7528\u3002\u5982\u679c\u4f60\u60f3\u8981\u540c\u6b65\u7684\u53ea\u662f\u4e00\u4e2a\u8bed\u53e5\uff0c\u90a3\u4e48\u4e0d\u9700\u8981\u82b1\u62ec\u53f7\u3002\u4e00\u4e2a\u540c\u6b65\u5757\u786e\u4fdd\u5bf9object\u6210\u5458\u65b9\u6cd5\u7684\u8c03\u7528\u4ec5\u5728\u5f53\u524d\u7ebf\u7a0b\u6210\u529f\u8fdb\u5165object\u7ba1\u7a0b\u540e\u53d1\u751f\u3002<\/p>\n
\u4e0b\u9762\u662f\u524d\u9762\u7a0b\u5e8f\u7684\u4fee\u6539\u7248\u672c\uff0c\u5728run( )\u65b9\u6cd5\u5185\u7528\u4e86\u540c\u6b65\u5757\uff1a
\n[java]\/\/ This program uses a synchronized block.
\nclass Callme {
\n\u00a0\u00a0\u00a0 void call(String msg) {
\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 System.out.print("[" + msg);
\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 try {
\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 Thread.sleep(1000);
\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 } catch (InterruptedException e) {
\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 System.out.println("Interrupted");
\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 }
\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 System.out.println("]");
\n\u00a0\u00a0\u00a0 }
\n}<\/p>\n
class Caller implements Runnable {
\n\u00a0\u00a0\u00a0 String msg;
\n\u00a0\u00a0\u00a0 Callme target;
\n\u00a0\u00a0\u00a0 Thread t;
\n\u00a0\u00a0\u00a0 public Caller(Callme targ, String s) {
\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 target = targ;
\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 msg = s;
\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 t = new Thread(this);
\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 t.start();
\n\u00a0\u00a0\u00a0 }<\/p>\n
\u00a0\u00a0\u00a0 \/\/ synchronize calls to call()
\n\u00a0\u00a0\u00a0 public void run() {
\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 synchronized(target) { \/\/ synchronized block
\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 target.call(msg);
\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 }
\n\u00a0\u00a0\u00a0 }
\n}<\/p>\n
class Synch1 {
\n\u00a0\u00a0\u00a0 public static void main(String args[]) {
\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 Callme target = new Callme();
\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 Caller ob1 = new Caller(target, "Hello");
\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 Caller ob2 = new Caller(target, "Synchronized");
\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 Caller ob3 = new Caller(target, "World");<\/p>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 \/\/ wait for threads to end
\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 try {
\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 ob1.t.join();
\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 ob2.t.join();
\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 ob3.t.join();
\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 } catch(InterruptedException e) {
\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 System.out.println("Interrupted");
\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 }
\n\u00a0\u00a0\u00a0 }
\n}
\n[\/java]
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