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Java Java Data Structures Getting There Type Casting

Now make sure that if a com.example.BlogPost is passed in for obj that you then cast it to a BlogPost. Return the result

of the getTitle method on the newly type-casted BlogPost instance.

I really dont understand what the question is asking me to do.

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 extends{
  /***************
  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 = (String)obj;
    if(obj instanceof String)
    result=  result;

    return result;
  }
}

1 Answer

Leen Leenaerts
Leen Leenaerts
1,096 Points

Casting it :

    BlogPost blogpost = (BlogPost) obj

Returning the title :

   return blogpost.getTitle()

I also just started learning Java since 2 days ago so I'm not sure if it's right but you can at least try it ;)