关于循环：Thread.sleep();在Java中

Thread.sleep(); in Java

每当我使用Thread.sleep();在do while循环中，提示告诉我："在循环中调用Thread.sleep可能会导致性能问题。"我已经从许多其他网站和书籍中听到了这一点。我可以用什么代替？

代码如下：

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23

import javax.swing.*;

public class Delay {

public static void main(String[] args) throws Exception {
int difficulty;
difficulty = Integer.parseInt(JOptionPane
.showInputDialog("How good are you?\
" +"1 = evil genius...\
"
+"10 = evil, but not a genius"));
boolean cont;
do {
cont = false;
System.out.println("12");
Thread.sleep(500);

String again = JOptionPane.showInputDialog("Play Again?");
if (again.equals("yes"))
cont = true;
} while (cont);
}
}