I am Showing you these 2 classes code, from Data Structures videos but the program is not working. why?

import java.util.Date;

import com.teamtreehouse.Treet;

public class Example {

public static void main(String[] args) { Treet treet = new Treet( "amitDhamankar", "Want to be famous? Simply tweet about Java and use" + " the hashtag #treet. I'll use yout tweet in a new" + "@treehouse code at data structures.", new Date(1468901376000L )); System.out.printf("This is a new Treet: %s \n",treet);

} }

And the other class is: package com.teamtreehouse;

public class Treet { private String mAuthor; private String mDescription; private Date mCreationDate;

public Treet(String author, String description, Date creationDate) { mAuthor = author; mDescription = description; mCreationDate = creationDate; }

public String getAuthor() { return mAuthor; }

public String getDescription() { return mDescription; }

public Date getCreationDate() { return mCreationDate; }

}