java获取本年最后一天 java取月份最后一天

package com.example.demo.controller;

import java.text.SimpleDateFormat;
import java.util.Calendar;
import java.util.Date;

public class Demo {

    /**
     * 根据年、月获取某月的最后一天
     */
    public static Date getLastDayOfMonth(int year,int month){
        Calendar cal = Calendar.getInstance();
        //设置年份
        cal.set(Calendar.YEAR,year);
        //设置月份
        cal.set(Calendar.MONTH, month-1);
        //获取某月最大天数
        int lastDay = cal.getActualMaximum(Calendar.DAY_OF_MONTH);
        //设置日历中月份的最大天数
        cal.set(Calendar.DAY_OF_MONTH, lastDay);

        return cal.getTime();
    }

    public static void main(String[] args) {
        SimpleDateFormat df = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
        System.out.println("某月的最后一天 = " + df.format(getLastDayOfMonth(2020,9)));
    }

}