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How to convert milliseconds value to date?

package com.javacoderanch.example.util;

import java.text.DateFormat;
import java.text.SimpleDateFormat;
import java.util.Calendar;

public class MillisecondsToDate {
    public static void main(String[] args) {
        //
        // Create a DateFormatter object for displaying date information.
        //
        DateFormat formatter = new SimpleDateFormat("dd/MM/yyyy hh:mm:ss.SSS");
        
        //
        // Get date and time information in milliseconds
        //
        long now = System.currentTimeMillis();

        //
        // Create a calendar object that will convert the date and time value
        // in milliseconds to date. We use the setTimeInMillis() method of the
        // Calendar object.
        //
        Calendar calendar = Calendar.getInstance();
        calendar.setTimeInMillis(now);
        
        System.out.println(now + " = " + formatter.format(calendar.getTime()));
    }
}