子线程先执行10次，主线程执行5次，子线程再执行10次，主线程再执行5次，如此反复3次

package com.mhm.test1;


/**
 * 子线程跑10次，主线程跑5次，然后子线程再跑10次，主线程再跑5次，往返3次
 * @author Mahone
 *
 */
public class Test2 {
	
	public static void main(String[] args) {
		Test2 t2 = new Test2();
		t2.init();
	}
	
	private void init() {
		final Business b = new Business();
		
		Thread t = new Thread(new Runnable() {
			@Override
			public void run() {
				for (int i = 0; i <3; i++) {
					b.sub(i);
				}
			}
		});
		t.start();
		for (int i = 0; i <3; i++) {
			b.main(i);
		}
		
	}
	
	
	/**
	 * 业务类
	 * @author Administrator
	 *
	 */
	class Business {
		// 默认subFlag为true，子线程可执行
		private boolean subFlag = true;
		
		public synchronized void sub(int loop) {
			// 如果子线程不可执行，则当前线程等待，CPU给其他线程使用
			if (!subFlag) {
				try {
					this.wait();
				} catch (InterruptedException e) {
					e.printStackTrace();
				}
			}
			
			for (int i = 0; i < 10; i++) {
				System.out.println("loop: " + loop + " sub-" + Thread.currentThread().getName());
			}
			
			// 执行完子线程，子线程flag设为false
			subFlag = false;
			// 通知其他线程开始响应
			this.notify();
		}
			
		
		public synchronized void main (int loop) {
			if (subFlag) {
				try {
					this.wait();
				} catch (InterruptedException e) {
					e.printStackTrace();
				}
			}
			
			for (int i = 0; i < 5; i++) {
				System.out.println("loop: " + loop + " main-" + Thread.currentThread().getName());
			}
		
			subFlag = true;
			this.notify();
		}
	}
	
	
}