Welcome to the Treehouse Community

Want to collaborate on code errors? Have bugs you need feedback on? Looking for an extra set of eyes on your latest project? Get support with fellow developers, designers, and programmers of all backgrounds and skill levels here with the Treehouse Community! While you're at it, check out some resources Treehouse students have shared here.

Looking to learn something new?

Treehouse offers a seven day free trial for new students. Get access to thousands of hours of content and join thousands of Treehouse students and alumni in the community today.

Start your free trial

Java Java Data Structures - Retired Exploring the Java Collection Framework Maps

Steven Stanton
Steven Stanton
59,998 Points
Posted by Steven Stanton
Steven Stanton
59,998 Points

Why is this a problem - "Expected 1 but received 1" ?

Anyone know why this responds with Bummer when it gets what it expects?

com/example/BlogPost.java 
package com.example;

import java.io.Serializable;
import java.util.ArrayList;
import java.util.Date;
import java.util.List;
import java.util.HashMap;
import java.util.Map;


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;
  }


}
com/example/Blog.java 
package com.example;

import java.util.List;
import java.util.Set;
import java.util.TreeSet;
import java.util.HashMap;
import java.util.Map;

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> getCategoryCounts(){
    Map<String,Integer> cCounts = new HashMap<String,Integer>();

    for (BlogPost post: mPosts){
      String category=post.getCategory();
      if (!cCounts.containsKey(category)){
        cCounts.put(category,new Integer(0));
      }
        int oldNumber = cCounts.get(category);
        cCounts.put(category,new Integer(oldNumber+1));
    }

    return cCounts;
  }
}
Steven Stanton
Steven Stanton
59,998 Points
Steven Stanton
Steven Stanton
59,998 Points

The excercise is testing Blog.getCategoryCounts(), and replies "Bummer! - for Entertainment expected 1 but received 1".

Cameron Raw
Cameron Raw
15,473 Points
Cameron Raw
Cameron Raw
15,473 Points

I think it's how you're using integers here. Instead of defining an integer with a method Integer() you can just type an integer, or use basic maths.

 public Map<String,Integer> getCategoryCounts(){
    Map<String,Integer> cCounts = new HashMap<String,Integer>();

    for (BlogPost post: mPosts){
      String category=post.getCategory();
      if (!cCounts.containsKey(category)){
        cCounts.put(category,0);
      }
        int oldNumber = cCounts.get(category) + 1;
        cCounts.put(category,oldNumber);
    }

    return cCounts;
  }

1 Answer

Cameron Raw
Cameron Raw
15,473 Points
Cameron Raw
Cameron Raw
15,473 Points

Just realised I put it in the comments section!

I think it's how you're using integers here. Instead of defining an integer with a method Integer() you can just type an integer, or use basic maths.

 public Map<String,Integer> getCategoryCounts(){
    Map<String,Integer> cCounts = new HashMap<String,Integer>();

    for (BlogPost post: mPosts){
      String category=post.getCategory();
      if (!cCounts.containsKey(category)){
        cCounts.put(category,0);
      }
        int oldNumber = cCounts.get(category) + 1;
        cCounts.put(category,oldNumber);
    }

    return cCounts;
  }