Challenge Task 2 for Type casting

Question

I am trying to work on Challenge Task 2 for type casting and does anyone know how to write the statement that checks whether the com.example is passed in or not and also how to return the results?

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.
    String result = "";
    if(obj instanceof String){
      result = (String) obj;}

    return result;
  }
}

Answer 1 · 2017-05-24T05:55:58Z

May 24, 2017 5:55am

Since we're working with the BlogPost class and creating BlogPost objects, we want to see if the 'object' being passed into the method is an instance of BlogPost.

We can test for that by using an 'if' statement and testing if our object is an instanceOf BlogPost. If it is, we could create a new BlogPost and type cast our object to it.

We could then use our method to get the part of our new blog post object that we want, type casting the output of our method to a String before we put it into our result.

Something like this:

if (obj instanceOf BlogPost){
  BlogPost myBlogPost = (BlogPost) obj;
  result = (String) myBlogPost.getTitle();
}

return result;

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Madeline Yao

Madeline Yao

Challenge Task 2 for Type casting

1 Answer

Bryanna Obrien

Bryanna Obrien