复件 leapyear.java

Java语言是目前最流行

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

public class leapyear extends Applet implements ActionListener
{
	Label result;
	TextField inl;
	Button btn;
	int year;
	boolean leap;
	public void init()
	{
		result=new Label("输入年份!");
		inl = new TextField(5);
		btn = new Button("判断");
		
		add(inl);
		add(btn);
		add(result);
		btn.addActionListener(this);	
	}	
	public void actionPerformed(ActionEvent e)
	{
		year = Integer.parseInt(inl.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");
		inl.setText("");
	}
}