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Start your free trialPreston Yeschick
10,803 PointsOutput is appropriate in editor but still fails challenge
My code outputs what appears to be an appropriate string, including the author name, post title and post description. The challenge returns, "I expected to see the first and last name input as args in the output, but I do not".
public class ForumPost {
private User mAuthor;
private String mTitle;
private String mDescription;
public ForumPost(User author, String title, String description) {
mAuthor = author;
mTitle = title;
mDescription = description;
}
public String getDescription() {
return mDescription;
}
public User getAuthor() {
return mAuthor;
}
public String getTitle() {
return mTitle;
}
// TODO: We need to expose the description
}
public class User {
private String mFirstName;
private String mLastName;
public User(String firstName, String lastName) {
// TODO: Set the private fields here
mFirstName = firstName;
mLastName = lastName;
}
public String getFirstName() {
return mFirstName;
}
public String getLastName() {
return mLastName;
}
}
public class Forum {
private String mTopic;
public Forum(String topic) {
mTopic = topic;
}
public String getTopic() {
return mTopic;
}
public void addPost(ForumPost post) {
/* When all is ready uncomment this...*/
System.out.printf("New post from %s %s about %s.\n",
post.getAuthor().getFirstName(),
post.getAuthor().getLastName(),
post.getTitle());
}
}
public class Example {
public static void main(String[] args) {
System.out.println("Starting forum example...");
if (args.length < 2) {
System.out.println("first and last name are required. eg: java Example Craig Dennis");
}
Forum forum = new Forum("Java");
// Take the first two elements passed args
User author = new User("Preston", "Yeschick");
// Add the author, title and description
ForumPost post = new ForumPost(author, "my title", "my description");
forum.addPost(post);
}
}
2 Answers
Kevin Faust
15,353 PointsHey Preston,
This was a tricky challenge as it was quite vague on the specifics. You've technically got everything right but the code checker wants something a bit different. Let's look at this:
User author = new User("Preston", "Yeschick");
Now logically speaking, we can see that the User class takes in a first name and last name string as the constructor parameters right? And your completely right. But now let's look at this top part in our Example.java file:
public static void main(String[] args) {
System.out.println("Starting forum example...");
if (args.length < 2) {
System.out.println("first and last name are required. eg: java Example Craig Dennis");
}
We haven't really worked with args so when I did this challenge way back when, I just glanced over this part not really paying attention to it and so I was confused as well. It looks like some weird foreign piece of code !
But anyways, what this is saying is that when we start our program up, we pass in an array of strings as a parameter value. Something like this:
["Prestion", "Yeschick"];
This will be an array that has a first and last name which the code checker will input automatically. If we have two values in our array, then we can use that as our first and last name right? In that if statement, we make sure that we have at least 2 things in our array otherwise we wouldn't be able to have a first and last name. If we passed in more than 2 things, that wouldn't matter as we are only dealing with the first two things in the array. Did that make sense?
So now back to the code, let's look at this:
User author = new User(args[0], args[1]);
We will take the first thing out of that array (the first name) and the second thing out of the array (the last name); That's basically what it wanted you to do and not to input your own strings directly.
I hope that helped you out and you now understand the challenge!!
Happy coding and best of luck ,
Kevin
Preston Yeschick
10,803 PointsI see now. Thanks for taking the time to write a robust explanation. I'm on track to finishing now. Thank you