/**
 * 典型案例：子线程执行10次，主线程执行100次，两者交替50次。
 */
package cn.itcast.lesson4;
public class TestWaitNotify {
	public static void main(String[] args){	
		final Business business= new Business();
		new Thread(
				new Runnable() {		
					public void run() {
						for(int i=1;i<=50;i++){
							business.sub(i);
						}
					}
				}	
		).start();
		for(int i=1;i<=50;i++){
			business.main(i);
		}
	}
}
class Business{
	private boolean bShouldSub = true;
	public synchronized void sub(int i){
		//如果bussiness调用sub的话，则【!bShouldSub =false，bShouldSub=true】;
		//然后主线程main为等待，执行完sub后就bShouldSub=false；唤醒主线程main。
		while(!bShouldSub){
			try {
				this.wait();
			} catch (InterruptedException e) {
				e.printStackTrace();
			}
		}
		for(int j=1;j<=10;j++){
			System.out.println("sub thread sequence of "+j+",loop of "+i);
	}
		bShouldSub = false;
		//唤醒main 
		this.notify();
	}
	public synchronized void main(int i){
		while(bShouldSub){
			try {
				this.wait();
			} catch (InterruptedException e) {
				e.printStackTrace();
			}
		}
		for(int j=1;j<=100;j++){
			System.out.println("main thread sequence of "+j+",loop of "+i);
		}		
		bShouldSub = true;
		//唤醒sub
		this.notify();
	}
}

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java多线程经典案例