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 Exploring the Java Collection Framework ArrayLists

Posted by Christopher Brady
Christopher Brady
7,102 Points

I'm not exactly sure why I'm getting the error message that I forgot to add the getExternalLinks Method. Anyone ?

I thought I had this one down but I can't really figure out why I'm getting this error message. Any help would be appreciated. Take pity, I've been doing this for the last two weeks. Still trying to retain everything.

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

import java.io.Serializable;
import java.util.*;


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 List<String> getWords() {
    String[] words = mBody.split("\\s+");
    return Arrays.asList(words);
  }

  public List<String> getExternalLinks(String http) {
    List<String> results = new ArrayList<String>();
    for (String link : getWords()) {
      if (link.startsWith("http")) {
        results.add(link);
      }
    }
    return results;
  }

  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;
  }
}
Christopher Brady
Christopher Brady
7,102 Points

Figured it out. I over complicated the problem. (-_) *doh!

package com.example;

import java.io.Serializable;
import java.util.ArrayList;
import java.util.Arrays;
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> results = new ArrayList<String>();
    for (String link : getWords()) {
      if (link.startsWith("http")) {
        results.add(link);
      }
    }
          return results;
  }

  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;
  }
}

1 Answer

Jon Kussmann
PLUS
Jon Kussmann
Courses Plus Student 7,254 Points
Jon Kussmann
Jon Kussmann
Courses Plus Student 7,254 Points

Hi Christopher,

It looks like you have an unnecessary parameter in your method declaration.

 public List<String> getExternalLinks() {
      // rest of your code
 }
Christopher Brady
Christopher Brady
7,102 Points

Caught it 15 minutes after posting the question lol. Thanks for the quick response though! Nice to know that you guys are actively answering questions.

Jon Kussmann
Jon Kussmann
Courses Plus Student 7,254 Points
Jon Kussmann
Jon Kussmann
Courses Plus Student 7,254 Points

It always feels better to figure out errors on your own, haha.