Safe conversion method of SimpleDateFormat Class in Java multithreaded Environment

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The SimpleDateFormat class

Package state;import java.text.ParseException;import java.text.SimpleDateFormat;import java.util.Date;/** * SimpleDateFormat class is responsible for date conversion and formatting * solving conversion errors in SimpleDateFormat multithreaded environment * @ author zc * * / public class SimpleDateFormatThread extends Thread {private SimpleDateFormat sdf; private String dateString; public SimpleDateFormatThread (SimpleDateFormat sdf,String dateString) {super (); this.sdf = sdf; this.dateString = dateString } @ Override public void run () {try {/ / System.out.println (dateString); / / the start date is incorrectly formatted as YYYY-MM-dd Date date = DateTools.getSimpleDateFormat ("yyyy-MM-dd") .parse (dateString); / / System.out.println (date); String newDateString = DateTools.getSimpleDateFormat ("yyyy-MM-dd") .format (date). ToString () If (! newDateString.equals (dateString)) {System.out.println ("ThreadName=" + this.getName () + "error date" + dateString+ "conversion date" + newDateString);} else {System.out.println ("ThreadName=" + this.getName () + dateString+ "conversion date" + newDateString);} catch (ParseException e) {/ / TODO Auto-generated catch block e.printStackTrace () } public static void main (String [] args) {SimpleDateFormat sdf = new SimpleDateFormat ("yyyy-MM-dd"); String [] dateStringArray = new String [] {"2020-02-05", "2020-02-06", "2020-02-07", "2020-02-08"}; SimpleDateFormatThread [] threadArray= new SimpleDateFormatThread [4]; for (int item0