Java 同步信号使用

package com.hp.concurrency;

public class SignalTest {
	public static final Object lock = new Object();

	public static void main(String[] args) {
		
		new TestThread().start();

		testRun();
	}

	public static void testRun() {
		
		try {
			Thread.sleep(200);
		} catch (InterruptedException e1) {
			// TODO Auto-generated catch block
			e1.printStackTrace();
		}
		synchronized (SignalTest.lock) {
				try {
					System.out.println("Main got SignalTest.lock ");
					Thread.sleep(200);
				} catch (InterruptedException e) {
					// TODO Auto-generated catch block
					e.printStackTrace();
				}
				SignalTest.lock.notify();
				
		
		}
		
		System.out.println("testRun over");
	}

}

class TestThread extends Thread {

	public void run() {
		synchronized (SignalTest.lock) {
			System.out.println("TestThread got SignalTest.lock ");
			try {
				Thread.sleep(4000);
				//SignalTest.lock.wait();
				SignalTest.lock.wait();
			} catch (InterruptedException e) {
				// TODO Auto-generated catch block
				e.printStackTrace();
			}
		}
		
		System.out.println("run over");
	}
}