Welcome to the Treehouse Community

Want to collaborate on code errors? Have bugs you need feedback on? Looking for an extra set of eyes on your latest project? Get support with fellow developers, designers, and programmers of all backgrounds and skill levels here with the Treehouse Community!

Looking to learn something new?

Treehouse offers a seven day free trial for new students. Get access to thousands of hours of content and join thousands of Treehouse students and alumni in the community today.

Start your free trial

Java Java Data Structures Getting There Type Casting

Steven Morimoto
Steven Morimoto
Courses Plus Student 1,836 Points

Having trouble with the date

Hi again, I'm able to create an object with the BlogPost but for some reason it gives me a compile time error. It doesn't make sense to me how this is incorrect.

Thanks in advance.

package com.example;

import java.util.Date;

public class BlogPost {
    private String mAuthor;
    private String mTitle;
    private String mBody;
    private String mCategory;
    private Date mCreationDate;

    public BlogPost(String author, String title, String body, String category, Date creationDate) {
      mAuthor = author;
      mTitle = title;
      mBody = body;
      mCategory = category;
      mCreationDate = creationDate;


    public String getAuthor() {
      return mAuthor;

    public String getTitle() {
      return mTitle;

    public String getBody() {
      return mBody;

    public String getCategory() {
      return mCategory;

    public Date getCreationDate() {
      return mCreationDate;
import com.example.BlogPost;

public class TypeCastChecker {
  I have provided 2 hints for this challenge.
  Change `false` to `true` in one line below, then click the "Check work" button to see the hint.
  NOTE: You must set all the hints to false to complete the exercise.
  public static boolean HINT_1_ENABLED = false;
  public static boolean HINT_2_ENABLED = false;

  public static String getTitleFromObject(Object obj) {
    // Fix this result variable to be the correct string.

    String result = "";
    if(obj instanceof String)
      result = (String) obj;
    BlogPost post = new BlogPost("steve", "java", "the block", "programming", Date(1498672155L));

    return result;


1 Answer

you need to check if obj is instance of BlogPost if it is then you create the blog post variable and set = to obj, remember to cast it to blog post. then set result = to blog post variable.getTitle().

if (obj instanceof BlogPost) {
  BlogPost bp = (BlogPost) obj;
  result = bp.getTitle();
  return result;