Java Custom Date Formatter

DateStringFormatter.java

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

/**
 * <b>DateStringFormatter</b>
 *
 * @author Salman
 * Url https://github.com/javagrails
 * @ since Created by Salman on 3/22/2016.
 * @ Use Example in comments
 */
 
public class DateStringFormatter {
    String givenDateStringPattern  = "MM/dd/yyyy";
    String wantedDateStringPattern = "dd-MM-yyyy";

    public DateStringFormatter() {
    }

    public DateStringFormatter(String givenDateStringPattern, String wantedDateStringPattern) {
        this.givenDateStringPattern = givenDateStringPattern;
        this.wantedDateStringPattern = wantedDateStringPattern;
    }

    private Date getDateFromGivenDateString(String dateString) {
        SimpleDateFormat givenDateStringPatternFormatter = new SimpleDateFormat(givenDateStringPattern);
        Date             date                            = null;
        try {
            // (2) give the formatter a String that matches the SimpleDateFormat pattern
            System.out.println("givenDateStringPattern : " + givenDateStringPattern + " dateString : " + dateString);
            date = givenDateStringPatternFormatter.parse(dateString);
            // (3) prints out "Tue Sep 22 00:00:00 EDT 2009"
            System.out.println("date : " + date);
        } catch (ParseException e) {
            // execution will come here if the String that is given
            // does not match the expected format.
            System.out.println("Exception :: getDateFromGivenDateString.");
            e.printStackTrace();
        }
        return date;
    }

    public String getFormatedDateString(String dateString) {
        SimpleDateFormat wantedDateStringPatternFormatter = new SimpleDateFormat(wantedDateStringPattern);
        String           wantedDateString        = null;
        Date             date                             = null;
        //  new java.text.SimpleDateFormat("dd-MM-yyyy").format(new java.text.SimpleDateFormat("yyyy-MM-dd").parse($P{txtToDate}))
        // (1) create a SimpleDateFormat object with the desired format.
        // this is the format/pattern we're expecting to receive.
        date = this.getDateFromGivenDateString(dateString);
        if (date == null) {
            date = new Date();
        }

        //String           expectedPattern = "MM/dd/yyyy";
        //SimpleDateFormat formatter       = new SimpleDateFormat(expectedPattern);
        try {
            wantedDateString = wantedDateStringPatternFormatter.format(date);
            System.out.println("wantedDateString : " + wantedDateString);
        } catch (Exception e) {
            // execution will come here if the String that is given
            // does not match the expected format.
            System.out.println("Exception :: getFormatedDateString.");
            e.printStackTrace();
        }

        return wantedDateString;
    }
}

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

/**

• Main
  *
• @author Salman
• @ https://github.com/javagrails
• @SInCE Created by Salman on 3/22/2016.

*/

public class Main {
public static void main(String[] args) {
DateStringFormatter dsfDefault = new DateStringFormatter();
DateStringFormatter dsfCustom = new DateStringFormatter("MM/dd/yyyy","dd-MM-yyyy");

    //  MM/dd/yyyy  ---to----> dd-MM-yyyy
    String userInput1   = "09/22/2009";     
    String userOutput1 = dsfDefault.getFormatedDateString(userInput1);
    System.out.println("\n\nuserInput1 : "+userInput1+" userOutput1 : "+userOutput1);

    String  ddddddddddd = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss").format(new Date());
    System.out.println("\n\n ddddddddddd : "+ddddddddddd);




    DateStringFormatter dsfCustom2 = new DateStringFormatter("MM/dd/yyyy","yyyy-MM-dd");        
    //  MM/dd//yyyy  ---to----> yyyy-MM-dd
    String userInput2   = "09/22/2009";     
    String userOutput2 = dsfCustom2.getFormatedDateString(userInput2);
    System.out.println("\n\n userInput2 : "+userInput2+" userOutput2 : "+userOutput2);


    DateStringFormatter dsfCustom3 = new DateStringFormatter("MM/dd/yyyy HH:mm:ss","yyyy-MM-dd HH:mm");     
    //  MM/dd//yyyy  ---to----> yyyy-MM-dd
    String userInput3   = "09/22/2009 11:02:22";        
    String userOutput3 = dsfCustom3.getFormatedDateString(userInput3);
    System.out.println("\n\n userInput3 : "+userInput3+" userOutput3 : "+userOutput3);

}

}