digitalclock.java

来自「由浅入深的介绍JAVAse的基本编程思想」· Java 代码 · 共 38 行

import java.util.*;
import javax.swing.*;

public class DigitalClock{
	public static void main(String[] args){
		JFrame jf = new JFrame("Clock");
		JLabel clock = new JLabel("Clock");
		clock.setHorizontalAlignment(JLabel.CENTER);
		jf.add(clock,"Center");
		jf.setSize(140,80);
		jf.setLocation(500,300);
		jf.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
		jf.setVisible(true);
		
		while(true){
			clock.setText(getTime());
			try{
				Thread.sleep(1000); //this.sleep(1000);	
			}catch(InterruptedException e){
				e.printStackTrace();	
			}	
		}	
	}
	public static String getTime(){
		Calendar c = new GregorianCalendar();
		String time = c.get(Calendar.YEAR) + "-" +
					  (c.get(Calendar.MONTH) + 1) + "-" +
					  c.get(Calendar.DATE)  + "  " ;
		int h = c.get(Calendar.HOUR_OF_DAY);
		int m = c.get(Calendar.MINUTE);
		int s = c.get(Calendar.SECOND);
		String ph = h<10 ? "0":"";
		String pm = m<10 ? "0":"";
		String ps = s<10 ? "0":"";		
		time += ph + h + ":" + pm + m + ":" + ps + s; 
		return time;
	}	
}