Welcome to the Treehouse Community

The Treehouse Community is a meeting place for developers, designers, and programmers of all backgrounds and skill levels to get support. Collaborate here on code errors or bugs that you need feedback on, or asking for an extra set of eyes on your latest project. Join thousands of Treehouse students and alumni in the community today. (Note: Only Treehouse students can comment or ask questions, but non-students are welcome to browse our conversations.)

Looking to learn something new?

Treehouse offers a seven day free trial for new students. Get access to thousands of hours of content and a supportive community. Start your free trial today.

Java Java Data Structures Exploring the Java Collection Framework Maps

Failure of Maps Challenge in Java Data Structures

Trying to complete the Maps Challenge. Keep getting error "Bummer for category Entertainment expected 1 received 1" code snippet below

public Map<String, Integer> getCategoryCounts() { Map<String, Integer> tMap = new HashMap<String, Integer>(); for (BlogPost post : mPosts) { String tString = post.getCategory(); Integer tInt = tMap.get(tString); if (tInt == null) { tMap.put(tString, new Integer(1)); } else { tMap.put(tString, tInt + 1); } } return tMap;
}

Any clues?

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

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

public class Blog {
  List<BlogPost> mPosts;

  public Blog(List<BlogPost> posts) {
    mPosts = posts;
  }

  public List<BlogPost> getPosts() {
    return mPosts;
  }

  public Map<String, Integer> getCategoryCounts() 
  {
    Map<String, Integer> tMap = new HashMap<String, Integer>();
    for (BlogPost post : mPosts) 
    {
      String tString = post.getCategory();
      Integer tInt = tMap.get(tString);
      if (tInt == null) 
      {
        tMap.put(tString, new Integer(1));
      }
      else 
      {
        tMap.put(tString, tInt + 1);
      }
    }
    return tMap;  
  }

  public Set<String> getAllAuthors() {
    Set<String> authors = new TreeSet<>();
    for (BlogPost post: mPosts) {
      authors.add(post.getAuthor());
    }
    return authors;
  }
}

1 Answer

Found it.

tMap.put("string", new Integer(1)); was not working like I thought

replaced with

tMap.put("string", 1)