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![Steven Morimoto](https://secure.gravatar.com/avatar/82bc24690366b5235da61bcc9b26fb28?s=96&d=https%3A%2F%2Fecs-static.teamtreehouse.com%2Fassets%2Fcontent%2Fdefault_avatar-445fbbabfc8dc9188fb5967fe43322ee0c3e0dd1e10f378bf8343784af5a13eb.webp&r=pg)
Steven Morimoto
Courses Plus Student 1,836 PointsWhat is the whole objective of type casting?
Hi, I understand how to type cast for the most part but I'm really at a loss as to why you would do it? I apologize if this is something that should be obvious, but I'm taking this info in a lot slower than everyone else.
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));
post.getTitle();
return result;
}
}
1 Answer
![Trent Christofferson](https://uploads.teamtreehouse.com/production/profile-photos/6253732/micro_241372963_187625796729552_3431139255907713985_n.jpg)
Trent Christofferson
18,846 Pointsin this case, you are checking to see if an Object is an instance of String. You need to do this because an anything can be an object. A string is an object. If you leave it as an object you will get an error saying result needs to be a string not object. Also, one more thing, if it is an object instead of a string you don't get the String's methods such as String.valueOf() or charAt().