showcalendar.java

能够显示当前月的日历,非常直观,这是我学 GUI的时候编的.

 import java.awt.*;
 import javax.swing.*;
 import java.util.* ;
 import javax.swing.border.*;
 public class ShowCalendar extends JFrame{
 	
 	/*the main method*/
 	public static void main(String[] args){ 
 	ShowCalendar frame=new ShowCalendar();
 	frame.setSize(400,200);
 	frame.setTitle("ShowCalendar");
 	frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
 	frame.setVisible(true);
 }
 
 
 public ShowCalendar(){
 	Integer[] num=new Integer[31];
		for(int n=0;n<31;n++)
		num[n]=new Integer(n+1);
    
   JLabel jl2=new JLabel(" Sun            Mon           Tue           Wed           Thu           Fri            Sat");
   JPanel p1=new JPanel();
   p1.setLayout(new BorderLayout());
   
   JPanel p2=new JPanel();
   p2.setLayout(new BorderLayout());
    
   JPanel p3=new JPanel();
   p3.setLayout(new GridLayout(5,7,0,0));
   	
   
   p2.add(jl2,BorderLayout.CENTER);
     Calendar a = new GregorianCalendar();
     int numberOfDays = a.getActualMaximum (Calendar.DAY_OF_MONTH);
     int year = a.get(Calendar.YEAR);
	 int month = a.get(Calendar.MONTH);
	 int m=month+1;
	 Calendar calendar = new GregorianCalendar(year,month,1);
	 int dayOfWeek = calendar.get(Calendar.DAY_OF_WEEK);
  JLabel jl1=new JLabel("                                                "+m+"/"+year);	 
  p1.add(jl1,BorderLayout.CENTER);
     for(int i=1;i<dayOfWeek;i++)
       p3.add(new JLabel());
       
     for(int j=1;j<=numberOfDays;j++){ 
    	JLabel label=new JLabel(num[j-1].toString());
         p3.add(label);
    	label.setBorder(new LineBorder(Color.orange,1));
    }
    getContentPane().setLayout(new BorderLayout(0,0));
    getContentPane().add(p1,BorderLayout.NORTH);
    getContentPane().add(p2,BorderLayout.CENTER);
    getContentPane().add(p3,BorderLayout.SOUTH);
    
  
 }
 }