How can I create a Date object with a specific format

问题

String testDateString = "02/04/2014";
DateFormat df = new SimpleDateFormat("dd/MM/yyyy"); 

Date d1 = df.parse(testDateString);
String date = df.format(d1);

Output String:

02/04/2014

Now I need the Date d1 formatted in the same way ("02/04/2014").

回答1:

If you want a date object that will always print your desired format, you have to create an own subclass of class Date and override toString there.

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

public class MyDate extends Date {
    private final SimpleDateFormat dateFormat = new SimpleDateFormat("dd/MM/yyyy");

    /*
     * additional constructors
     */

    @Override
    public String toString() {
        return dateFormat.format(this);
    }
}

Now you can create this class like you did with Date before and you don't need to create the SimpleDateFormat every time.

public static void main(String[] args) {
    MyDate date = new MyDate();
    System.out.println(date);
}

The output is 23/08/2014.

This is the updated code you posted in your question:

String testDateString = "02/04/2014";
DateFormat df = new SimpleDateFormat("dd/MM/yyyy"); 

MyDate d1 = (MyDate) df.parse(testDateString);
System.out.println(d1);

Note that you don't have to call df.format(d1) anymore. d1.toString() will return the date as the formated string.

回答2:

Try like this:

    SimpleDateFormat sdf =  new SimpleDateFormat("dd/MM/yyyy");

    Date d= new Date(); //Get system date

    //Convert Date object to string
    String strDate = sdf.format(d);

    //Convert a String to Date
    d  = sdf.parse("02/04/2014");

Hope this may help you!

来源：https://stackoverflow.com/questions/25460965/how-can-i-create-a-date-object-with-a-specific-format

标签

java

date

java.util.date