Welcome to the Treehouse Community
Want to collaborate on code errors? Have bugs you need feedback on? Looking for an extra set of eyes on your latest project? Get support with fellow developers, designers, and programmers of all backgrounds and skill levels here with the Treehouse Community! While you're at it, check out some resources Treehouse students have shared here.
Looking to learn something new?
Treehouse offers a seven day free trial for new students. Get access to thousands of hours of content and join thousands of Treehouse students and alumni in the community today.
Start your free trial
maxmaltsev
3,419 PointsJava Forum Challenge
Hello,
I am a bit confused about last Java Basics Challenge (Main.java):
So I’ve passed required arguments: firstName, lastName, title, description and author - program gives an error:
Are you sure you used the arguments passed in from the main method in Main.java? args[0] is the firstName and args[1] should be the last name
But it compiles in the “Preview”:
Beginning forum example
A new post in Java topic from Some Firstname Some Lastname about Some title is available
I think confusion comes from below constructor: we are passing 3 parameters and the first one is User author - how should we use it? to pass just a name? a word?
public ForumPost (User author, String title, String description){
this.author = author;
this.title = title;
this.description = description;
public class Forum {
private String topic;
public Forum (String topic){
this.topic = topic;
}
public String getTopic() {
return topic;
}
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 {
private String firstName;
private String lastName;
public User(String firstName, String lastName) {
this.firstName = firstName;
this.lastName = lastName;
}
public String getFirstName(){
return firstName;
}
public String getLastName(){
return lastName;
}
}
public class ForumPost {
private User author;
private String title;
private String description;
public ForumPost (User author, String title, String description){
this.author = author;
this.title = title;
this.description = 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);
}
Forum forum = new Forum("Java");
// TODO: pass in the first name and last name that are in the args parameter
User author = new User("Some Firstname", "Some Lastname");
// TODO: initialize the forum post with the user created above and a title and description of your choice
ForumPost post = new ForumPost(author, "Some title", "Some description");
forum.addPost(post);
}
}
1 Answer
Simon Coates
28,694 Pointsi think the preview is only for syntax errors. The program still has to meet the treehouse verification. it wants:
User author = new User(args[0], args[1]);
maxmaltsev
3,419 Pointsmaxmaltsev
3,419 PointsYour suggestion worked, but it still doesn't make any sense to me :)
Maybe it's because I am using Eclipse IDE or I don't understand something here.
Simon Coates
28,694 PointsSimon Coates
28,694 Pointsits the same as yours except instead of using string literals, it's using values provided via the args parameter. As such, you could pass in the name arguments from the command prompt when running the program.