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Start your free trialJessie Burton
5,198 PointsCant reconcile errors
cannot find symbol on mPost
and dont know how to getCategory without BlogPost.getCategory())
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.List;
import java.util.HashMap;
import java.util.Map;
import java.util.Set;
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 (BlogPost post: mPosts) {
authors.add(post.getAuthor());
}
return authors;
}
public Map<String, Integer> getCategoryCount() {
Map<String, Integer> categoryCount = new HashMap<String, Integer>();
for (BlogPost post : mPost) {
String category = BlogPost.getCategory());
Integer count = categoryCount.get(category);
if (count == null) {
count = 0;
}
count++;
categoryCount.put(category, count);
}
return categoryCount;
}
}
2 Answers
markmneimneh
14,132 PointsHello
This like looks wrong
String category = BlogPost.getCategory());
do you mean
String category = post.getCategory());
?
andren
28,558 PointsYour code is pretty close to correct but there are some issues.
The BlogPost
list is called mPosts
not mPost
(notice the s at the end). That is what causes the current error you are getting.
As for getting the categories, in your for loop you have access to the individual BlogPost
objects in the list via the post
variable. You can call the getCategory
method on that to get access to the category of the post. Note also that you have an extra closing parenthesis in the line where you call getCategory
which should not be there.