Java How to change date format in a String

If Java 8, DateTimeFormatter, else SimpleDateFormat to change the date format in a String.

1. DateTimeFormatter (Java 8)

Convert the String to LocalDateTime and change the date format with DateTimeFormatter

package com.mkyong;
import java.time.LocalDateTime;
import java.time.format.DateTimeFormatter;
public class DateFormatExample1 {
	// date format 1
    private static final DateTimeFormatter dateFormatter 
		= DateTimeFormatter.ofPattern("yyyy-MM-dd HH:mm:ss.S");
	// date format 2
    private static final DateTimeFormatter dateFormatterNew 
		= DateTimeFormatter.ofPattern("EEEE, MMM d, yyyy HH:mm:ss a");
    public static void main(String[] args) {
        String date = "2019-05-23 00:00:00.0";
		// string to LocalDateTime
        LocalDateTime ldateTime = LocalDateTime.parse(date, dateFormatter);
        System.out.println(dateFormatter.format(ldateTime));
        // change date format
        System.out.println(dateFormatterNew.format(ldateTime));

Output

2019-05-23 00:00:00.0
Thursday, May 23, 2019 00:00:00 AM

2. SimpleDateFormat

Convert the String to Date and change the date format with SimpleDateFormat

package com.mkyong;
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Date;
public class SimpleDateFormatExample {
    private static final SimpleDateFormat sdf = 
			new SimpleDateFormat("yyyy-MM-dd HH:mm:ss.S");
    private static final SimpleDateFormat sdfNew = 
			new SimpleDateFormat("EEEE, MMM d, yyyy HH:mm:ss a");
    public static void main(String[] args) {
        String dateString = "2019-05-23 00:00:00.0";
        try {
			// string to date
            Date date = sdf.parse(dateString);
            System.out.println(sdf.format(date));
            System.out.println(sdfNew.format(date));
        } catch (ParseException e) {
            e.printStackTrace();

Output

2019-05-23 00:00:00.0
Thursday, May 23, 2019 00:00:00 AM