多线程

问题：

子线程循环10次，接着主线程循环5次，接着又回到子线程循环10次，主线程循环5次，这样总共循环50次

package com.huawei.interview;

/**
 * 子线程循环10次，接着主线程循环5次，接着又回到子线程循环10次，主线程循环5次，这样总共循环50次
 * @author yangjianzhou
 *
 */
public class ThreadTest2 {
	public static void main(String[] args) {
		new ThreadTest2().init();
	}

	public void init(){
		final Business business = new Business();
		new Thread(
				new Runnable(){
					public void run(){
						for(int i=0;i<50;i++){
							business.SubThread(i);
						}
					}
				}
		).start();

		for(int i=0;i<50;i++){
			business.MainThread(i);
		}
	}

	private class Business{
		boolean bShouldSub = true;
		public synchronized void MainThread(int i){
			if(bShouldSub){
				try{
					this.wait();
				}catch (Exception e) {
					e.printStackTrace();
				}
			}
			for(int j=0;j<5;j++){
				System.out.println(Thread.currentThread().getName()+": i = "+i+", j = "+j);
			}
			bShouldSub=true;
			this.notify();

		}

		public synchronized void SubThread(int i){
			if(!bShouldSub){
				try{
					this.wait();
				}catch (Exception e) {
					e.printStackTrace();
				}
			}
			for(int j=0;j<10;j++){
				System.out.println(Thread.currentThread().getName()+" : i = "+i+", j = "+j);
			}
			bShouldSub = false;
			this.notify();
		}
	}
}

求解运行过程？