模拟线程的等待和通知

class TestLock

import java.util.Random;

/**
 * 	模拟线程的等待和通知
 * 	不建议在线程中使用  sleep
 * @author NSG
 *
 */
public class TestLock {
	
	public static void main(String[] args) {
		TestLock tl = new TestLock();
		tl.start();
	}
	
//	定义锁
	Object lock = new Object();
//	全局变量
	int count;
	
	private void start() {
		
		try {
			Thread.sleep(100);
		} catch (InterruptedException e1) {
			e1.printStackTrace();
		}
		System.out.println("主程序");
		
			Thread th = new Thread(new Runnable() {
			
				@Override
				public void run() {				
					synchronized(lock) {
						System.out.println("子线程");
						Random r = new Random();
						int min = r.nextInt(6) + 1;
						
						try {
							Thread.sleep(min);
						} catch (InterruptedException e) {
							e.printStackTrace();
						}
						
						System.out.println("sleep： " + min);
							//锁的通知
						lock.notify();
						count = 13;							
					}
				}
			});
			//启动线程
			th.start();
	
		synchronized (lock) {
			try {
			//锁的等待
				lock.wait();
			} catch (InterruptedException e) {
				e.printStackTrace();
			}
			int back = 10 + count;
			System.out.println(back);
		}			
	}
}

TIP： 线程的启动要在锁外