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Start your free trialAttila Tamás
1,168 PointsCan someone help with the 4th Forum challenge?
I'm a little lost at the 4th challenge, that goes like this: "After you uncomment the code in Main.java and Forum.java, fix the code as described in the comments of Main.java. The code in main is attempting to use the code you just fixed."
Can someone help please? :)
public class Forum {
private String topic;
// TODO: add a constructor that accepts a topic and sets the private field topic
public Forum(String topic){
this.topic = topic.Forum.java();
}
public String getTopic() {
return topic;
}
/* Uncomment this when you are prompted to do so*/
public void addPost(ForumPost post) {
System.out.printf("A new post in %s topic from %s %s about %s is available",
topic,
post.getAuthor().getFirstName(),
post.getAuthor().getLastName(),
post.getTitle()
);
}
}
public class User {
// TODO: add private fields for firstName and lastName
private String firstName;
private String lastName;
public User(String firstName, String lastName) {
// TODO: set and add the private fields
firstName = "";
lastName = "";
}
// TODO: add getters for firstName and lastName
public String getFirstName(){
return firstName;
}
public String getLastName(){
return lastName;
}
}
public class ForumPost {
private User author;
private String title;
private String description;
// TODO: add a constructor that accepts the author, title and description
public ForumPost(User author, String title, String description){
author = "";
title = "";
description = "";
}
public User getAuthor() {
return author;
}
public String getTitle() {
return title;
}
public String getDescription() {
return description;
}
}
public class Main {
public static void main(String[] args) {
System.out.println("Beginning forum example");
if (args.length < 2) {
System.out.println("Usage: java Main <first name> <last name>");
System.err.println("<first name> and <last name> are required");
System.exit(1);
}
//Uncomment this when prompted
Forum forum = new Forum("Java");
// TODO: pass in the first name and last name that are in the args parameter
User author = new User(String getFirstName(), String getLastName());
// TODO: initialize the forum post with the user created above and a title and description of your choice
ForumPost post = new ForumPost(user.getFirstName().user.getLastName());
forum.addPost(post);
//
}
}
2 Answers
Kyle McCullen
16,639 PointsThe first todo says ‘pass the first name and last name that are in the args parameter’. The names are passed into the main method call. The args parameter is a String array and the first index of the args array is the first name, the second indexs of the args areay is the last name.
Kyle McCullen
16,639 PointsHere is a reference to understanding the args parameter passed into the main method.
https://www.quora.com/What-does-the-String-args-in-a-Java-main-method-actually-mean
User author = new User(arg[0], arg[1]);
Attila Tamás
1,168 PointsForum forum = new Forum("Java");
// TODO: pass in the first name and last name that are in the args parameter
User author = new User(args[0], args[1]);
// TODO: initialize the forum post with the user created above and a title and description of your choice
ForumPost post = new ForumPost(getAuthor(), "Title", "description");
forum.addPost(post);
I am here currently, What did i do wrong? Still don't know what the mistake is.
Attila Tamás
1,168 PointsAttila Tamás
1,168 PointsHow would it look like in code,
Attila Tamás
1,168 PointsAttila Tamás
1,168 PointsPlease can you just give the solution? I can't solve it :D
Kyle McCullen
16,639 PointsKyle McCullen
16,639 Pointshttps://teamtreehouse.com/community/java-objects-final-editor-the-forum
Attila Tamás
1,168 PointsAttila Tamás
1,168 PointsWhat? But i tried it like that, and gave me compile error.. Thank you so much, i must have missed something then. :)
Attila Tamás
1,168 PointsAttila Tamás
1,168 PointsOkay, now i got it. I corrected a constructor, by initialising them like
this.variable = variable;
instead of
variable = "";
I got a messange saying "Are you sure i passed down the right variables, like args[0] should be the firstName and args[1] should be the lastName." I corrected this error, by correcting every single constructor the way i told above. Now i completed the challenge, and i'm happy :D