Introduction to the usage of SimpleDateFormat in Java (code example)

import java.util.Date;

public class SimpleDateFormatDemo {
    public static void main(String[] args) {
        Date currentTime = new Date();
        System.out.println(currentTime); // 输出：Mon Feb 18 10:24:30 CST 2019
    }
}

package com.zwwhnly.springbootdemo;

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

public class SimpleDateFormatDemo {
    public static void main(String[] args) {
        Date currentTime = new Date();
        System.out.println(currentTime);    // Mon Feb 18 13:53:50 CST 2019

        SimpleDateFormat simpleDateFormat1 = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss.SSS");
        SimpleDateFormat simpleDateFormat2 = new SimpleDateFormat("yyyy-MM-dd");
        SimpleDateFormat simpleDateFormat3 = new SimpleDateFormat("yyyy/MM/dd");

        System.out.println(simpleDateFormat1.format(currentTime));  // 输出2019-02-18 13:53:50.629
        System.out.println(simpleDateFormat2.format(currentTime));  // 输出2019-02-18
        System.out.println(simpleDateFormat3.format(currentTime));  // 输出2019/02/18
    }
}

![snipaste_20190218_141555](E:\临时\20190218\snipaste_20190218_141555.png)package com.zwwhnly.springbootdemo;

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

public class SimpleDateFormatDemo {
    public static void main(String[] args) {

        try {
            SimpleDateFormat simpleDateFormat1 = new SimpleDateFormat("yyyy-MM-dd HH:mm");

            String strDate1 = "2019-02-18 13:58";
            String strDate2 = "2019-02-18";

            Date date1 = simpleDateFormat1.parse(strDate1);
            System.out.println(date1);
            Date date2 = simpleDateFormat1.parse(strDate2);
            System.out.println(date2);
        } catch (ParseException e) {
            e.printStackTrace();
        }
    }
}