import java.text.ParseException;

import java.text.SimpleDateFormat;

import java.util.Date;

public class Demo {

    public static void main(String[] args) throws ParseException {

        SimpleDateFormat simpleDateFormat = new SimpleDateFormat("yyyy-MM-dd");//注意月份是MM

        Date date = simpleDateFormat.parse("2019-09-02");

        System.out.println(date);   //Mon Sep 02 00:00:00 CST 2019

        System.out.println(simpleDateFormat.format(date));  //2019-09-02

    }

}