Calendar类判断闰年，平年

1.思路：
只要查看2月份有29天即可

package com.fanjia.practice;

import org.junit.Test;

import java.util.Calendar;

/**
 * Created by FanJia on 2020/8/16 17:55
 */
public class Demo05 {
    
    


    @Test
    public void test() {
    
    
        Calendar c1 = Calendar.getInstance();
        int year = 2004;
        c1.set(year, 2, 1);
        c1.add(Calendar.DAY_OF_MONTH, -1);
        if (c1.get(Calendar.DAY_OF_MONTH) == 29) {
    
    
            System.out.println("闰年");
        } else {
    
    
            System.out.println("平年");
        }


    }
}