ex.java

倒计时源码,很适合初学者学习,非常简单,是一个类文件

import java.util.Calendar;
import java.util.GregorianCalendar;
import java.awt.*;
import javax.swing.*;

public class Ex extends JFrame{
    public Ex() {
        super("倒计时");
        setBackground(Color.WHITE);
         setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
         setBounds(150,150,300,300);
        JLabel label1 = new JLabel("距2009年过年还有：");
        JLabel label2 = new JLabel(getDay());
        label2.setForeground(Color.RED);
        label2.setFont(new Font("黑体",Font.BOLD,20));
        JLabel label3 = new JLabel("天！");
        Container pane = getContentPane();
        pane.setLayout(new FlowLayout());
        pane.add(label1);
        pane.add(label2);
        pane.add(label3);
        show();

    }
    public String getDay(){
        GregorianCalendar now = new GregorianCalendar();
       GregorianCalendar dayAoyun =new GregorianCalendar(2009,Calendar.JANUARY,25);
       long temp =dayAoyun.getTimeInMillis()-now.getTimeInMillis();
       long days = temp/(1000*60*60*24)+1;
       String day=String.valueOf(days);
       return day;
    }
    public static void main(String[] args) {
       Ex  ex = new Ex();
    }
}