三个线程循环打印abc十次

朋友问的题，试着写写。也许有其他实现方式，感觉题目应该是考察线程间协作wait和notify所以选择如下方式实现：

/**
 * @author my_corner
 * 2011-12-26
 */
public class ThreadPrint {

	/**
	 * @author my_corner
	 * @param 
	 * @return 
	 * @throws InterruptedException 
	 */
	public static void main(String[] args) throws InterruptedException {
		PrintTask task = new PrintTask();
		
		Thread a = new Thread(task);
		a.setName("a");
		Thread b = new Thread(task);
		b.setName("b");
		Thread c = new Thread(task);
		c.setName("c");
		
		a.start();
		b.start();
		c.start();
		
	}

}

class PrintTask implements Runnable{
	private int times = 0;

	/**
	 * 
	 */
	@Override
	public void run() {
		while(times<30){
			synchronized (this) {
				if(times%3==0){
					if("a".equals(Thread.currentThread().getName())){
						System.out.print("a");
						times++;
						this.notifyAll();
					}else{
						try {
							this.wait();
						} catch (InterruptedException e) {
							e.printStackTrace();
						}
					}
				}
				if(times%3==1){
					if("b".equals(Thread.currentThread().getName())){
						System.out.print("b");
						times++;
						this.notifyAll();
					}else{
						try {
							this.wait();
						} catch (InterruptedException e) {
							e.printStackTrace();
						}
					}
				}
				if(times%3==2){
					if("c".equals(Thread.currentThread().getName())){
						System.out.print("c");
						times++;
						this.notifyAll();
					}else{
						try {
							this.wait();
						} catch (InterruptedException e) {
							e.printStackTrace();
						}
					}
				}
			}
		}
	}
	
}