Java로 String 형식의 Date format 변경

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

SimpleDateFormat transFormat1 = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
SimpleDateFormat transFormat1_1 = new SimpleDateFormat("yyyyMMddHHmmss");

String actualBeginDt = "20210210011120"

Date actualBeginDt_date = transFormat1_1.parse(actualBeginDt);
actualBeginDt = transFormat1.format(actualBeginDt_date);  // "2021-02-10 01:11:20"

String -> Date 는 parse(String)

Date -> String 은 format(Date)