mycalendar.java

里面写的是 一些J2SE 的日历和 计算机的代码 还有时间钟表的代码 供初学者参考

import  java.awt.*;
import  java.awt.event.*;

public class MyCalendar extends Frame implements ActionListener, ItemListener{
	boolean IsLeapYear;
    static int Year=2000; static  int Month=1;  int Days;
     int TotalDays=0;  int BeforeDays = 0;  int FirstDayOfMonth=0;
   
    Choice  YearChoice  = new Choice();
    Choice 	MonthChoice = new Choice();
  
    Label   YearLabel   = new Label("年");
   
   
    Label   MonthLabel  = new Label("月");
    
    Label  sun=new Label("SUN");
    Label  mon=new Label("MON");
    Label  tue=new Label("TUE");
    Label  wed=new Label("WED");
    Label  thu=new Label("THU");
    Label  fri=new Label("FRI");
    Label  sat=new Label("SAT");
    
    Panel panel=new Panel(new GridLayout(6,7));  
    Label[] l=new Label[42];
    public MyCalendar(String title){
    	super(title);
    	
    	 
    	
    	for(int i=0;i<42;i++){
    		l[i]=new Label("");
    		panel.add(l[i]);
    	}
    	String[] Year=new String[10];
    	for(int i=0;i<10;i++){
    		Year[i]=String.valueOf(i+2000);
    		YearChoice.add(Year[i]);
    	}
    	
    	String[]  Month={"1","2","3","4","5","6","7","8","9","10","11","12"};
    	for(int i=0;i<Month.length;i++){
    		MonthChoice.add(Month[i]);
    	}
    	
    	 YearChoice.addItemListener(this);
         MonthChoice.addItemListener(this);
    	 
    	setLayout(null);
    	YearChoice.setBounds(50,40,60,60);
    	YearLabel.setBounds(110,43,15,15);
    	add(YearChoice);  add(YearLabel);
    	
    	MonthChoice.setBounds(170,40,60,60);
    	MonthLabel.setBounds(230,43,15,15);
    	add(MonthChoice);  add(MonthLabel);
    	
    	sun.setBounds(20,70,30,20);
    	mon.setBounds(60,70,30,20);
    	tue.setBounds(100,70,30,20);
    	wed.setBounds(140,70,30,20);
    	thu.setBounds(180,70,30,20);
    	fri.setBounds(220,70,30,20);
    	sat.setBounds(260,70,30,20);
    	
    	add(sun); add(mon); add(tue);  add(wed); add(thu); add(fri); add(sat);
    	
    
        
    	panel.setBounds(25,95,280,140);
    	panel.setVisible(true);
    	add(panel);
    	
    	addWindowListener(new WindowAdapter (){
	    	public void windowClosing(WindowEvent e){
	    		MyCalendar.this.dispose();
	    	}
	    });
    }
	
	public void PrintCalendar(int Year,int Month){
		if (Year % 4 == 0 && !(Year % 100 == 0) || Year % 400 == 0){
			   IsLeapYear = true; // 闰年
			   
         } 
        else{
        	 IsLeapYear = false;// 平年
        	 
         }
		
	    for (int i = 1900; i < Year; i++) {
            if (i % 4 == 0 && !(i % 100 == 0) || i % 400 == 0)    TotalDays = TotalDays + 366; // 闰年366天
            else    TotalDays = TotalDays + 365; // 平年365天
	    }
	    
	    for (int i = 1; i <= Month; i++) {
           switch (i) {
               case 1:
               case 3:
               case 5:
               case 7:
               case 8:
               case 10:
               case 12:   Days = 31; break;
               case 2:    if (IsLeapYear)   Days = 29;
                          else  Days = 28; 
                          break;
               default: Days = 30; break;
          }
          if (i < Month) {
               BeforeDays = BeforeDays + Days;
          }
       }
      
       TotalDays = TotalDays + BeforeDays;
       
      
       int Remainder=1+TotalDays%7;
       
      
       
       if(Remainder==7)  FirstDayOfMonth=0;
       else              FirstDayOfMonth=Remainder; 
       
       
       for(int i=0;i<FirstDayOfMonth;i++)
           l[i].setText("");   
       for(int i=0;i<Days;i++)
       	l[i+FirstDayOfMonth].setText(String.valueOf(i+1));
       for(int i=41;i>=Days+FirstDayOfMonth;i--)
           l[i].setText("");
       TotalDays=0;  FirstDayOfMonth=0; BeforeDays = 0;
   }
	   
	public void actionPerformed(ActionEvent e){}
	
	public void itemStateChanged(ItemEvent e){
		if(e.getSource()==MonthChoice) {
		     
		      Month=Integer.parseInt(MonthChoice.getSelectedItem());
		      PrintCalendar(Year,Month);
		      System.out.println(Month);	
		}
		
		if(e.getSource()==YearChoice){
			 
		     Year=Integer.parseInt(YearChoice.getSelectedItem());
		     PrintCalendar(Year,Month);
		     System.out.println(Year);
		}
		    
	}
	
	public static void main(String[] args)throws Exception{
		MyCalendar frame=new MyCalendar("2000年-2010年日历");
		frame.setSize(310,250);
		frame.setVisible(true);
		frame.PrintCalendar(Year,Month);
		
	}
}