java中常用的日期工具类简介说明

1.获取当前日期

LocalDate now = LocalDate.now();
//只获取年月日  2023-05-24
System.out.println(now);

Date date = new Date();
//获取年月日时分秒  Mon May 22 10:08:33 CST 2023
System.out.println(date);

2.单独获取年月日

LocalDate now = LocalDate.now();
System.out.println(now);//只获取年月日  2023-05-24

System.out.println(now.getYear());//2023
System.out.println(now.getMonthValue());//5
System.out.println(now.getDayOfMonth());//24

3.创建任意日期

LocalDate of = LocalDate.of(2023, 5, 24);//需要传入年月日参数
System.out.println(of);//2023-05-24

4.判断两个日期的大小

//当前日期2023-05-24
LocalDate now = LocalDate.now();
LocalDate of = LocalDate.of(2023, 5, 24);
if (now.equals(of)){
     System.out.println("两个日期相等");
 }else if (now.isAfter(of)){
     System.out.println("now大于of");
 }else {
     System.out.println("now大=小于of");
 }
 

5.判断是否是闰年

 
LocalDate now = LocalDate.now();
boolean leapYear = now.isLeapYear();
if (leapYear){
	System.out.println("是闰年");
}else {
	System.out.println("不是闰年");
}