编程闰年的计算方法,计算闰年的程序

package com.lovo.homework;


import javax.swing.JOptionPane;


public class RunNian {


public int year;

public void judgeYear(){
String year1=JOptionPane.showInputDialog(null,"输入一个年份");
year=Integer.parseInt(year1);
if(year%400==0||year%4==0&&year%100!=0){
JOptionPane.showMessageDialog(null, "闰年");
}
else{
JOptionPane.showMessageDialog(null, "非闰年");
}
}

public static void main(Stringqxdttt args) {
RunNian runNian=new RunNian();
runNian.judgeYear();


}


}