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Start your free trialDarrell Parrent
Courses Plus Student 1,539 PointsGetting and error on the return line: /example/Blog.java:44: error: cannot find symbol return catCounts.get(cat);
Why is this error generated? The compiler is not finding variable cat. Is this not the correct way to return each category and count for each category.
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.HashSet;
import java.util.Set;
import java.util.Map;
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 getCategoryCounts(String catName, Integer catCounter){
Map <String, Integer> catCounts = new HashMap<String, Integer>();
for (BlogPost post : mPosts){
String cat = post.getCategory();
if(catCounts.get(cat) != null) {
// Increment the count like before.
Integer count = catCounts.get(cat);
count++;
catCounts.put(cat, count);
}
else {
//Start the count out at 1.
catCounts.put(cat, 1);
}
}
return catCounts.get(cat);
}
}
1 Answer
Craig Dennis
Treehouse TeacherYour return
statement is outside of your for loop. The variable cat is set inside the for-each
loop. It looks to be a scoping problem.
Is your return
statement what you actually meant?
Craig Dennis
Treehouse TeacherCraig Dennis
Treehouse TeacherYou might also want to restart the challenge, the method signature seems off too....