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Start your free trialAbe Daniels
Courses Plus Student 2,781 PointsNot sure how to typecast the title from BlogPost
How would I go about typecasting the title from my BlogPost area?
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 result;
public static String getTitleFromObject(Object obj) {
// Fix this result variable to be the correct string.
if (obj instanceof String) {
String result = (String) obj;
return result;
}
return result;
if (obj instanceof BlogPost) {
return BlogPost[1];
}
}
}
1 Answer
Ken Alger
Treehouse TeacherAbe;
Casting can be a difficult concept to grasp indeed. In your TypeCastChecker.java
you are returning a BlogPost
when checking if obj
is an instanceof BlogPost
, and your getTitleFromObject
is expecting a String
returned. I am guessing that is where you want to do you casting and that then grab something that is a String
to return.
You could do something along the lines of:
/* Code omitted for brevity */
if (obj instanceof BlogPost) {
BlogPost bp = (BlogPost) obj; /* casting */
result = bp.getTitle(); /* grab the Title of the Blog Post */
}
return result;
It looks like you have multiple return
statements as well. You can clean those up a bit and follow a skeleton of:
if (something happens here) {
/* do something great */
result = somethingGreat;
}
if (something else happens here) {
/* do something awesome */
result = somethingAwesome;
}
return result;
Hope it helps and post back if you are still stuck.
Happy coding,
Ken