leapyearframe.java

JBuilder9 精髓 source code1.rar

package leapyear;

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;

/**
 * <p>Title: Leapyear</p>
 * <p>Description: This is a program to judge a leap year</p>
 * <p>Copyright: Copyright (c) 2003</p>
 * <p>Company: </p>
 * @author not attributable
 * @version 1.0
 */

public class leapyearFrame extends JFrame {
  JPanel contentPane;
  BorderLayout borderLayout1 = new BorderLayout();
  TextArea textArea1 = new TextArea();

  //Construct the frame
  public leapyearFrame() {
    enableEvents(AWTEvent.WINDOW_EVENT_MASK);
    try {
      jbInit();
    }
    catch(Exception e) {
      e.printStackTrace();
    }
  }
  //Component initialization
  private void jbInit() throws Exception  {
    contentPane = (JPanel) this.getContentPane();

    int year=1989;//method1
        if((year%4==0&&year%100!=0)||(year%400==0))
        textArea1.append (year+"is a leap year.\n");
        else
        textArea1.append (year+"is not a leap year.\n");
        year=2000;//method2
        boolean leap;
        if(year%4!=0)
        leap=false;
        else if(year%100!=0)
        leap=true;
        else if(year%400!=0)
        leap=false;
        else
        leap=true;
        if(leap==true)
         textArea1.append (year+"is a leap year.\n");
         else
         textArea1.append (year+"is not a leap year.\n");
         year=2050;//method3
         if(year%4==0){
         if(year%100==0){
         if(year%400==0)
         leap=true;
         else
         leap=false;
        }else
        leap=false;
        }else
        leap=false;
        if(leap==true)
        textArea1.append (year+" is a leap year.\n");
        else
        textArea1.append( year+" is not a leap year.\n");

    contentPane.setLayout(borderLayout1);
    this.setSize(new Dimension(400, 300));
    this.setTitle("Leap year");
    contentPane.add(textArea1, BorderLayout.CENTER);
  }
  //Overridden so we can exit when window is closed
  protected void processWindowEvent(WindowEvent e) {
    super.processWindowEvent(e);
    if (e.getID() == WindowEvent.WINDOW_CLOSING) {
      System.exit(0);
    }
  }
}