leapyear.java.bak

《Java程序设计与应用》-张仕斌-源程序 《Java程序设计与应用》-张仕斌-源程序

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

public class leapyear extends Applet implements ActionListener{
  Label result;
  TextField in1;
  Button btn;
  int year;
  boolean leap;
  
public void init( ){
   result =new Label("请输入待判断的年份");
   in1=new TextField(5);
   btn=new Button("判断");
   add(in1);
   add(btn);
   add(result);
   btn.addActionListener(this));
}
public void actionPerformed(ActionEvent e){
    year=Integer.parseInt(in1.getText());
    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)
    result.setText(year+"年是闰年");
else 
    result.setText(year+"年不是闰年");
in1.setText("");
}
}