判断闰年?

Question

从键盘输入一个年份,判断是不是闰年.大虾帮忙写写这个程序啊!

Answer 1

import javax.swing.*;
import java.awt.Graphics;public class yearJudge extends JApplet{
String year;
int y;
String judge;

public void init(){

year = JOptionPane.showInputDialog("Enter the year please!");
y = java.lang.Integer.parseInt(year);
if (y % 4==0) {

  judge = "Yes";}
}
public void paint (Graphics g){
g.drawLine(15,10,210,10);
g.drawLine(15,30,210,30);
g.drawString(judge,25,25);
}
}

Answer 2

应该这样判断吧:
if(
( (y%4==0)&&(y%100!=0) )
||(y%400==0)
)
judge="Yes";

Answer 3

public class Year
{
public boolean isLeapYear(int value)
{
boolean result = false;
if((value%4 == 0 && value%100 != 0) || value%400 == 0)
result = true;
return result;
}
}

Answer 4

public static boolean isLeapYear(int nYear)
    {
        boolean bRet = false;
        if (0 == (nYear % 100))
        {
            if (0 == (nYear % 400))
            {
                bRet = true;
            }
        }
        else
        {
            if (0 == (nYear % 4))
            {
                bRet = true;
            }
        }
        return bRet;
    }