time.java

一个JAVA的学生管理系统,用的是GUI的图形用户界面.

import java.awt.*;
import java.awt.font.*;
import javax.swing.*;
import javax.swing.event.*;
import java.util.*;
import java.math.*;




////////////////开始的入口处在pp2





class Settime extends JPanel implements Runnable{
	Calendar now;
	Thread th2=null;
	int year,month,date,hour,minute,second;
	//int day,hour_,minute_,second_;
	JLabel settime=new JLabel(),lasttime=new JLabel();
	public Settime(){
		setLayout(new GridLayout(2,1));
		add(settime);add(lasttime);
		th2=new Thread(this);
		th2.start();
	}
	public void run(){
		while(true){
			now=Calendar.getInstance();
			year=now.get(Calendar.YEAR);
			month=now.get(Calendar.MONTH)+1;
			date=now.get(Calendar.DATE);
			hour=now.get(Calendar.HOUR_OF_DAY);
			minute=now.get(Calendar.MINUTE);
			second=now.get(Calendar.SECOND);
			//day=26-date;
			//hour_=24-hour;
			//minute_=60-minute;
			//second_=60-second;
			String aa=String.valueOf(year),ab=String.valueOf(month),ac=String.valueOf(date),ad=String.valueOf(hour),ae=String.valueOf(minute),af=String.valueOf(second);
			//String ba=String.valueOf(day),bb=String.valueOf(hour_),bc=String.valueOf(minute_),bd=String.valueOf(second_);
			String tm="时间：",jm="距放假还有",fm="就解放啦！";
			settime.setText(tm+aa+"年"+ab+"月"+ac+"日"+ad+"时"+ae+"分"+af+"秒");
			//lasttime.setText(jm+ba+"天"+bb+"小时"+bc+"分"+bd+"秒"+fm);
			try{
				th2.sleep(500);
			}catch(InterruptedException e){
				System.out.println("settime的休眠失败！");
			}
		}
	}
}
class A{
	JFrame f=null;
	public void A(){
		
		Settime a=new Settime();
		f=new JFrame("abcd");
		Container cp=f.getContentPane();
		cp.add(a);
		f.pack();
		f.setVisible(true);	
	}
	public static void main(String args[]){
		A b=new A();
		b.A();
//		int i=100;
//		System.out.println(i);
	}
}