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

Pablo Viramontes
Pablo Viramontes
3,542 Points

what is the compilation problem??

Yikes, java.lang.IllegalAccessException: Class JavaTester can not access a member of class com.example.Blog with modifiers ""

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.Arrays;
import java.util.List;
import java.util.Set;
import java.util.TreeSet;
import java.util.HashSet;
import java.util.ArrayList;
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;
  }
  Map<String,Integer> getCategoryCounts(){
    Map<String,Integer> catCounts = new HashMap<String, Integer>();
    for(BlogPost b : mPosts){
      Integer count = catCounts.get(b.getCategory());
      if(count == null){
          count = 0;
        }
        count++;
        catCounts.put(b.getCategory(),count);
    }
    return catCounts;
  }
}

1 Answer

andren
andren
28,558 Points

The problem is that you have not set the access level of the getCategoryCounts method to public. Which prevents the code checker from accessing it.

If you add the public access modifier to the method like this:

public Map<String,Integer> getCategoryCounts(){ // <- Added public access modifier
  Map<String,Integer> catCounts = new HashMap<String, Integer>();
  for(BlogPost b : mPosts){
    Integer count = catCounts.get(b.getCategory());
    if(count == null){
      count = 0;
    }
    count++;
    catCounts.put(b.getCategory(),count);
  }
  return catCounts;
}

Then your code will work.

Pablo Viramontes
Pablo Viramontes
3,542 Points

Of course cant belive i missed that. Thank you very much andren.