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Start your free trialRonit Mankad
12,166 PointsUnknown error plz help
I get this error : "java.lang.NullPointerException (Look around Forum.java line 15)" Also can someone help me with passing author name in Forum post= new ForumPost( )
public class ForumPost {
private User mAuthor;
private String mTitle;
private String mDescription;
public User getAuthor() {
return mAuthor;
}
public ForumPost(User author,String title, String description) {
mDescription=description;
mTitle= title;
}
public String getTitle() {
return mTitle;
}
public String getDescription() {
return mDescription;
}
// 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 String getTopic() {
return mTopic;
}
public Forum(String topic) {
mTopic=topic;
}
public void addPost(ForumPost post) {
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("Ronit", "Mankad");
// Add the author, title and description
ForumPost post = new ForumPost( author ,"Horray","great");
forum.addPost(post);
}
}
1 Answer
Kourosh Raeen
23,733 PointsIn the ForumPost constructor you need to set mAuthor to author.