实验代码：

package shiyan14;

import javax.swing.JFrame;

import javax.swing.JLabel;

import javax.swing.JPanel;

public class SwitchTest {

private JFrame jFrame;

private JLabel jl1;

private JLabel jl2;

private JLabel jl3;

public static void main(String[] args) {

new SwitchTest().getTime();

}

private void getTime() {

long time = 3600;

long hour = 0;

long minute = 0;

long seconds = 0;

while (time > 0) {

hour = time / 3600;

minute = (time - hour * 3600) / 60;

seconds = time - hour * 3600 - minute * 60;

jl1.setText(hour + "时");

jl2.setText(minute + "分");

jl3.setText(seconds + "秒");

try {

Thread.sleep(1000);

} catch (InterruptedException e) {

e.printStackTrace();

}

time--;

}

}

public SwitchTest() {

jFrame = new JFrame("倒计时");

jl1 = new JLabel();

jl2 = new JLabel();

jl3 = new JLabel();

init();

}

private void init() {

JPanel jPanel = new JPanel();

jPanel.add(jl1);

jPanel.add(jl2);

jPanel.add(jl3);

jFrame.add(jPanel);

jFrame.setVisible(true);

jFrame.setLocation(300, 400);

jFrame.setSize(300, 200);

jFrame.setDefaultCloseOperation(jFrame.EXIT_ON_CLOSE);

}

}

实验结果：

实验心得：本次实验还是较难的，希望继续努力吧