Date

package com.liu.demo1;

import java.util.Date;

public class Dat {
    public static void main(String[] args) {
        //今天
        Date date1 = new Date();
        System.out.println(date1.toString());
        System.out.println(date1.toLocaleString());
        //昨天
        Date date2 = new Date(date1.getTime()-(60*60*12*1000));
        System.out.println(date2.toLocaleString());
        //after 在xx之后吗   before xx之前吗
        boolean b1 = date1.after(date2);
        System.out.println(b1);
        boolean b2 = date1.before(date2);
        System.out.println(b2);
        //compareTo 比较  大为1  小为-1  相等为0
        System.out.println(date1.compareTo(date2));
        //equals 比较是否相等
        boolean b3 = date1.equals(date2);
        System.out.println(b3);
        //setTime 修改时间



    }
}