java动态执行while循环

问题描述：

public void M1(int second){
		boolean flag = true;
		while(flag){
			//执行second秒后退出while循环
		}
	}

实现思路：

设置一个定时器执行定时任务,到达指定时间后把flag的值设置成false

代码

import java.util.Timer;
import java.util.TimerTask;

public class Main {
	public static void main(String[] args) throws Exception {
		Timer timer = new Timer();//定时器
		int delay = 5;//秒
		Provider pd = new Provider(timer);
		pd.M1(delay);
		Thread.sleep(delay+100);
		timer.cancel();//注销定时器,否则虚拟机不退出
		
	}
}

class Provider{
	private Timer timer = null;
	public Provider(Timer timer){
		this.timer = timer;
	}
	
	public void M1(int second) {
		// TODO Auto-generated method stub
		class ScheduleHelper{
			public boolean flag = true;
		}
		final ScheduleHelper helper = new ScheduleHelper();//final内部类才能调用
		timer.schedule(new TimerTask() {
			@Override
			public void run() {
				System.out.println("set end");
				helper.flag = false;//设置结束
				
			}
		}, second*1000);
		while (helper.flag) {
				try {
					Thread.sleep(1000);//1秒执行一次while循环
					System.out.println("executing.....");
				} catch (InterruptedException e) {
					// TODO Auto-generated catch block
					e.printStackTrace();
				}
				
		}
		System.out.println("method end");	
	}
}

执行结果

executing.....
executing.....
executing.....
executing.....
executing.....
set end
executing.....
method end

最后

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