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Start your free trialmelissa zhang
760 PointsAdd public getters for firstName and lastName. Please help to code this.
Hi, can anyone show me how to code this question. Many thanks.
public class Forum {
private String topic;
// TODO: add a constructor that accepts a topic and sets the private field topic
private Forum(String topic){
topic=field;
}
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 =field;
lastName =field;
}
// TODO: add getters for firstName and lastName
public getFirstName(){
private String field;
return firstName;
}
public getLastName(){
lastName = field;
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 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();
// TODO: initialize the forum post with the user created above and a title and description of your choice
ForumPost post = new ForumPost();
forum.addPost(post);
// */
}
}
4 Answers
Dino Šporer
5,430 Points1) public Forum (String topic) { this.topic = topic; }
2)private String firstName; private String lastName;
this.firstName = firstName; this.lastName = lastName;
public String getFirstName() { return firstName; }
public String getLastName() { return lastName; }
3) public ForumPost (User author, String title, String description ) { this.author = author; this.title = title; this.description = description; }
4)
Forum forum = new Forum("Java");
User author = new User(args[0], args[1]);
ForumPost post = new ForumPost(author, "new title", "no description");
forum.addPost(post);
Alexander La Bianca
15,959 PointsHi,
In your constructor you need to set the private fields firstName and lastName to whatever is passed into the constructor. Like this:
public User(String firstName, String LastName) {
//set the private field firstName to the firstName parameter
this.firstName = firstName;
//set the private field lastName to the lastName parameter
this.lastName = lastName
}
Note that the keyword 'this' is only used because the parameter and the private fields have the same name. If your parameters were something like pFirstName and pLastName you would not have to use the keyword 'this'.
Next your public getters should just return whatever the value of the private fields are.
public String getFirstName() {
return firstName;
}
You do not need to create a extra variables like you did. Simply return the value for firstName. So when you actually use the User class it could be something like this:
User myUser = new User("Alex", "La Bianca");
String lastNameofMyUser = myUser.getLastName(); //returns "La Bianca"
String firstNameofMyUser = myUser.getFirstName(); //returns "Alex"
Dino Šporer
5,430 PointsYes, ofcourse! :)
melissa zhang
760 PointsYou are a STAR! Thanks a lot.
Dino Šporer
5,430 Pointsdino.sporer88@gmail.com here is my mail, so you can write or something :D
melissa zhang
760 PointsAwesome!!! Thanks.
melissa zhang
760 Pointsmelissa zhang
760 Pointsthank you so so much!!!!!