yield 方法

package extthread;
public class MyThread extends Thread {
	@Override
	public void run() {
		long beginTime = System.currentTimeMillis();
		int count = 0;
		for (int i = 0; i < 50000000; i++) {
			Thread.yield();
			count = count + (i + 1);
		}
		long endTime = System.currentTimeMillis();
		System.out.println("用时：" + (endTime - beginTime) + "毫秒！");
	}
}

package test;
import extthread.MyThread;
import extthread.MyThread;
public class Run {
	public static void main(String[] args) {
		MyThread thread = new MyThread();
		thread.start();
	}
}