leapyeartest.java

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import java.applet.*;
import java.awt.*;
import java.awt.event.*;
public class LeapyearTest extends Applet implements ActionListener
{
  Label result;
  TextField t1;
  Button btn;
  int year;
  boolean leap;
  public void init()
  {
    result=new Label("请输入要判断的年份");
    t1=new TextField(5);
    btn=new Button("判断");
    add(t1);
    add(btn);
    add(result);
    btn.addActionListener(this);
  }
  public void actionPerformed(ActionEvent e)
  {
    year=Integer.parseInt(t1.getText());
    if((year%4==0)&&((year%100)!=0))
    {
      leap=true;
    }
    else if (year%400==0)
    {
      leap=true;
    }
    else
    {
      leap=false;
    }
    if(leap==true)
      result.setText(year+"年是闰年");
    else
      result.setText(year+"年不是闰年");
    t1.setText(" ");
  }
}