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Start your free trialAllison Hanna
36,222 Pointsassistance with Create a method in Blog called getAllAuthors, Java Data Structures
Hey there, I lost my work once when the console zonked out. Not the end of the world, but this time through I am having trouble still and on top of that I'm getting a mess of errors that seem inaccurate and I can't scroll through them or copy/paste to help. I'm certain I still have errors, but I'm not sure where to go next.
So basically, I know I don't have the right answer yet but also I'm not sure to what extent the workspace is functioning properly.
package com.example;
import java.io.Serializable;
import java.util.ArrayList;
import java.util.Date;
import java.util.List;
public class BlogPost implements Comparable<BlogPost>, Serializable {
private String mAuthor;
private String mTitle;
private String mBody;
private String mCategory;
private Date mCreationDate;
public BlogPost(String author, String title, String body, String category, Date creationDate) {
mAuthor = author;
mTitle = title;
mBody = body;
mCategory = category;
mCreationDate = creationDate;
}
public int compareTo(BlogPost other) {
if (equals(other)) {
return 0;
}
return mCreationDate.compareTo(other.mCreationDate);
}
public String[] getWords() {
return mBody.split("\\s+");
}
public List<String> getExternalLinks() {
List<String> links = new ArrayList<String>();
for (String word : getWords()) {
if (word.startsWith("http")) {
links.add(word);
}
}
return links;
}
public String getAuthor() {
return mAuthor;
}
public String getTitle() {
return mTitle;
}
public String getBody() {
return mBody;
}
public String getCategory() {
return mCategory;
}
public Date getCreationDate() {
return mCreationDate;
}
}
package com.example;
import java.util.HashSet;
import java.util.List;
import java.util.TreeSet;
public class Blog {
List<BlogPost> mPosts;
public Blog(List<BlogPost> posts) {
mPosts = posts;
}
public List<BlogPost> getPosts() {
return mPosts;
}
public Set<String> getAllAuthors() {
Set<String> authors = new TreeSet<>();
}
for (Blog post : mPost) {
allAuthors.add(post.getAuthor());
}
}
3 Answers
Allison Hanna
36,222 PointsHmm. I finally found something that works from another person's post, but (and I feel silly) I know I couldn't walk it through for somebody else. If anyone comes across this and has a minute to add some explanation, I'd be grateful. Thanks!
public Set<String> getAllAuthors() {
Set<String> authors = new TreeSet<>();
for (BlogPost post: mPosts) {
authors.add(post.getAuthor());
}
return authors;
}
James Lambert
Courses Plus Student 14,477 PointsIt will if you change the for statement.
for (BlogPost post : mPosts){}
Enrique Munguía
14,311 PointsYou have an idea, let's fix the code
public Set<String> getAllAuthors() {
Set<String> authors = new TreeSet<>(); // create a new set
for (Blog post : mPosts) { // mPosts is the correct name
authors .add(post.getAuthor()); // adds every author to the set
}
return authors; // return the set
}
This code fills a set of strings with all of the authors, the for each loop iterates al the posts contained in the list of post.
Dennis Van Laarhoven
988 Pointsit doesnt work?