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Java Java Data Structures - Retired Getting There Type Casting

Jovy Ong
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Jovy Ong
Front End Web Development Techdegree Student 14,858 Points
Posted by Jovy Ong
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Jovy Ong
Front End Web Development Techdegree Student 14,858 Points

My if block is not passing?

I'm trying to complete Challenge Task 2 and I pretty much got the code down already but for some reason I'm getting a Bummer error. What am I doing wrong for this excercise?

com/example/BlogPost.java 
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;
    }
}
TypeCastChecker.java 
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.
    if(obj instanceof BlogPost) {
      BlogPost b = (BlogPost)obj;
      return b.getTitle();
    } else {
    return "";  
    }
  }
}

2 Answers

Cam Richardson
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MOD
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Cam Richardson
Front End Web Development Treehouse Moderator 16,895 Points
Cam Richardson
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Cam Richardson
Front End Web Development Treehouse Moderator 16,895 Points

So this exercise is a bit confusing in that the value that Craig is passing in is a string in both tasks, even though it seems like he would be passing in a BlogPost object in the second task. So the problem is that it's expecting a string to be returned and you removed the check for a String object. You can try it this way:

public static String getTitleFromObject(Object obj) {
    if (obj instanceof String) {
      return (String) obj;
    } else if (obj instanceof BlogPost) {
      BlogPost b = (BlogPost)obj;
      return b.getTitle();
    } else {
      return "";  
    }
  }