Java编程之一小时倒计时程序

问题描述：利用Java编程实现一小时倒计时小程序。

程序源码：

package pm;

import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;

public class SwitchTest {
	
	private JFrame frame;
	
	private  JLabel jl1;
	
	private JLabel jl2;
	
	private JLabel jl3;
	
	/*主方法*/
	public static void main(String[] args) {
		
		new SwitchTest().getTime();
		
	}
	/*倒计时的主要代码块*/
	private  void getTime(){
		long time=1*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--;
		}
		
		
	}
	/*构造 实现界面的开发 GUI */
	public SwitchTest(){
		frame = new JFrame("倒计时");
		jl1 = new JLabel();
		jl2 = new JLabel();
		jl3 = new JLabel();
		
		init();
		
	}
	/*组件的装配*/
	private void init(){
		JPanel jp=new JPanel();
		jp.add(jl1);
		jp.add(jl2);
		jp.add(jl3);
		
		frame.add(jp);
		
		frame.setVisible(true);
		frame.setLocation(300,400);
		frame.setSize(300, 200);
		frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
	}

}