JAVA延时执行

import java.awt.AWTException;
import java.awt.Robot;
 
public class mycode {
 
	public static void main(String[] args) throws AWTException {
 
		Robot r = new Robot();
		
 
		for (int i = 1; i <= 3; i++) {
 
			r.delay(2000);
			System.out.println(i);
 
		}
 
	}
 
}