Java延时的三种方法

import java.awt.AWTException;
import java.awt.Robot;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.Timer;
import java.util.TimerTask;
public class Text1 {
    public static void main(String[] args) throws AWTException {
        //延时方法一
        Robot robot = new Robot();
        SimpleDateFormat dateFormat = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss ");
        System.out.println("延时前 ："+dateFormat.format(new Date()));
        robot.delay(2000);
        System.out.println("延时后 ："+dateFormat.format(new Date()));
        //延时方法二
        try {
            Thread.sleep(3000);
            System.out.println("Thread延时后 ："+dateFormat.format(new Date()));
        } catch (InterruptedException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
        //延时方法三
        Timer timer = new Timer();
        timer.schedule(new TimerTask() {
            @Override
            public void run() {
                System.out.print("----时间： "+dateFormat.format(new Date()));
                this.cancel();
            }
        }, 2000);
        System.out.print("三秒后打印时间:");
        }
    }