为Thread撰写两个子类，其中一个的run()在启动后取得第二个Thread object reference，然后调用wait()。另一个子类的run()在过了数秒之后调用notifyAll()，唤醒第一个线程，使第一个线程可以印出消息。
这里面的“取得第二个Thread object reference”是什么意思啊，高手能用代码解释下吗
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应该是取得第二个线程对象的引用的意思吧，我也正在学多线程编程。
- Java code
public class ThreadTest { private Thread child = null; /** * @param args */ public static void main(String[] args) { ThreadTest test = new ThreadTest(); test.work(); } public void work() { myThread1 thread1 = new myThread1(); myThread2 thread2 = new myThread2(); //将第二个线程的引用赋值给成员变量child this.child = thread2; thread1.start(); thread2.start(); } class myThread1 extends Thread { public void run() { synchronized(child) { try { child.wait(); } catch (InterruptedException e) { e.printStackTrace(); } System.out.println("我睡醒了，现在开始打印信息"); } } } class myThread2 extends Thread { public void run() { synchronized(this) { try { sleep(5 * 1000); } catch (InterruptedException e) { e.printStackTrace(); } System.out.println("唤醒另一个线程吧"); this.notifyAll(); } } }}
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忘记加注释了
- Java code
public class ThreadTest { private Thread child = null; /** * @param args */ public static void main(String[] args) { ThreadTest test = new ThreadTest(); test.work(); } public void work() { myThread1 thread1 = new myThread1(); myThread2 thread2 = new myThread2(); //将第二个线程的引用赋值给成员变量child this.child = thread2; thread1.start(); thread2.start(); } class myThread1 extends Thread { public void run() { synchronized(child) { try { //取得第二个Thread object reference，然后调用wait() child.wait(); } catch (InterruptedException e) { e.printStackTrace(); } System.out.println("我睡醒了，现在开始打印信息"); } } } class myThread2 extends Thread { public void run() { synchronized(this) { try { sleep(5 * 1000); } catch (InterruptedException e) { e.printStackTrace(); } System.out.println("唤醒另一个线程吧"); this.notifyAll(); } } }}