Java线程问题 Java线程问题
java\u7ebf\u7a0b\u95ee\u9898\uff1a\u600e\u6837\u591a\u6b21\u6267\u884cpublic class NumberPrintDemo {// n\u4e3a\u5373\u5c06\u6253\u5370\u7684\u6570\u5b57private static int n = 1;// state=1\u8868\u793a\u5c06\u7531\u7ebf\u7a0b1\u6253\u5370\u6570\u5b57, state=2\u8868\u793a\u5c06\u7531\u7ebf\u7a0b2\u6253\u5370\u6570\u5b57, state=3\u8868\u793a\u5c06\u7531\u7ebf\u7a0b3\u6253\u5370\u6570\u5b57private static int state = 1;public static void main(String[] args) { final NumberPrintDemo pn = new NumberPrintDemo(); new Thread(new Runnable() { public void run() { // 3\u4e2a\u7ebf\u7a0b\u6253\u537075\u4e2a\u6570\u5b57, \u5355\u4e2a\u7ebf\u7a0b\u6bcf\u6b21\u6253\u53705\u4e2a\u8fde\u7eed\u6570\u5b57, \u56e0\u6b64\u6bcf\u4e2a\u7ebf\u7a0b\u53ea\u9700\u6267\u884c5\u6b21\u6253\u5370\u4efb\u52a1. 3*5*5=75 for (int i = 0; i < 5; i++) { // 3\u4e2a\u7ebf\u7a0b\u90fd\u4f7f\u7528pn\u5bf9\u8c61\u505a\u9501, \u4ee5\u4fdd\u8bc1\u6bcf\u4e2a\u4ea4\u66ff\u671f\u95f4\u53ea\u6709\u4e00\u4e2a\u7ebf\u7a0b\u5728\u6253\u5370 synchronized (pn) { // \u5982\u679cstate!=1, \u8bf4\u660e\u6b64\u65f6\u5c1a\u672a\u8f6e\u5230\u7ebf\u7a0b1\u6253\u5370, \u7ebf\u7a0b1\u5c06\u8c03\u7528pn\u7684wait()\u65b9\u6cd5, \u76f4\u5230\u4e0b\u6b21\u88ab\u5524\u9192 while (state != 1) try { pn.wait(); } catch (InterruptedException e) { e.printStackTrace(); } // \u5f53state=1\u65f6, \u8f6e\u5230\u7ebf\u7a0b1\u6253\u53705\u6b21\u6570\u5b57 for (int j = 0; j < 5; j++) { // \u6253\u5370\u4e00\u6b21\u540en\u81ea\u589e System.out.println(Thread.currentThread().getName() + ": " + n++); } System.out.println(); // \u7ebf\u7a0b1\u6253\u5370\u5b8c\u6210\u540e, \u5c06state\u8d4b\u503c\u4e3a2, \u8868\u793a\u63a5\u4e0b\u6765\u5c06\u8f6e\u5230\u7ebf\u7a0b2\u6253\u5370 state = 2; // notifyAll()\u65b9\u6cd5\u5524\u9192\u5728pn\u4e0await\u7684\u7ebf\u7a0b2\u548c\u7ebf\u7a0b3, \u540c\u65f6\u7ebf\u7a0b1\u5c06\u9000\u51fa\u540c\u6b65\u4ee3\u7801\u5757, \u91ca\u653epn\u9501. // \u56e0\u6b643\u4e2a\u7ebf\u7a0b\u5c06\u518d\u6b21\u7ade\u4e89pn\u9501 // \u5047\u5982\u7ebf\u7a0b1\u6216\u7ebf\u7a0b3\u7ade\u4e89\u5230\u8d44\u6e90, \u7531\u4e8estate\u4e0d\u4e3a1\u62163, \u7ebf\u7a0b1\u6216\u7ebf\u7a0b3\u5c06\u5f88\u5feb\u518d\u6b21wait, \u91ca\u653e\u51fa\u521a\u5230\u624b\u7684pn\u9501. // \u53ea\u6709\u7ebf\u7a0b2\u53ef\u4ee5\u901a\u8fc7state\u5224\u5b9a, \u6240\u4ee5\u7ebf\u7a0b2\u4e00\u5b9a\u662f\u6267\u884c\u4e0b\u6b21\u6253\u5370\u4efb\u52a1\u7684\u7ebf\u7a0b. // \u5bf9\u4e8e\u7ebf\u7a0b2\u6765\u8bf4, \u83b7\u5f97\u9501\u7684\u9053\u8def\u4e5f\u8bb8\u662f\u66f2\u6298\u7684, \u4f46\u524d\u9014\u4e00\u5b9a\u662f\u5149\u660e\u7684. pn.notifyAll(); } } } }, "\u7ebf\u7a0b1").start(); new Thread(new Runnable() { public void run() { for (int i = 0; i < 5; i++) { synchronized (pn) { while (state != 2) try { pn.wait(); } catch (InterruptedException e) { e.printStackTrace(); } for (int j = 0; j < 5; j++) { System.out.println(Thread.currentThread().getName() + ": " + n++); } System.out.println(); state = 3; pn.notifyAll(); } } } }, "\u7ebf\u7a0b2").start(); new Thread(new Runnable() { public void run() { for (int i = 0; i < 5; i++) { synchronized (pn) { while (state != 3) try { pn.wait(); } catch (InterruptedException e) { e.printStackTrace(); } for (int j = 0; j < 5; j++) { System.out.println(Thread.currentThread().getName() + ": " + n++); } System.out.println(); state = 1; pn.notifyAll(); } } } }, "\u7ebf\u7a0b3").start(); } }
\u7a0b\u5e8f\u8fd0\u884c\u90fd\u4f1a\u7533\u8bf7CPU\u8d44\u6e90\uff0c\u7531\u4e8eCPU\u7684\u5355\u4f4d\u65f6\u95f4\u7cbe\u786e\u5230\u7eb3\u79d2\uff0c\u6240\u4ee5\u6211\u4eec\u770b\u8d77\u6765cpu\u53ef\u4ee5\u5728\u4e00\u6bb5\u65f6\u95f4\u5185\u5904\u7406\u591a\u4e2a\u7ebf\u7a0b\uff0c\u4f46\u5b9e\u9645\u4e0a\u5355\u4f4d\u65f6\u95f4\u5185cpu\u53ea\u80fd\u5904\u7406\u4e00\u4e2a\u7ebf\u7a0b\uff0c\u4f7f\u7528\u7ebf\u7a0b\u7684sleep()\u65b9\u6cd5\u5c31\u53ef\u4ee5\u628a\u8be5\u7ebf\u7a0b\u5360\u6709\u7684cpu\u8d44\u6e90\u8ba9\u51fa\u6765\u4ea4\u7ed9\u5176\u4ed6\u7ebf\u7a0b\u4f7f\u7528\u3002
线程只能调用一次start方法，这将使线程进入待运行状态，等待分配CPU时间片。在线程中的run方法执行完毕后，线程进入死亡状态，该线程生命结束。一个线程对象只可以调用一次start方法。试图在线程死亡后再次调用start方法将抛出IllegalThreadStateException异常。线程运行完后就释放对了，不能再次运行start方法
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