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Java Java Data Structures Exploring the Java Collection Framework ArrayLists

Leen Leenaerts
Leen Leenaerts
1,096 Points

im getting errors

./com/example/BlogPost.java:32: error: cannot find symbol public List getExternalLinks() { ^ symbol: class List location: class BlogPost ./com/example/BlogPost.java:33: error: cannot find symbol List words = Arrays.asList(getWords()); ^ symbol: class List location: class BlogPost ./com/example/BlogPost.java:33: error: cannot find symbol List words = Arrays.asList(getWords()); ^ symbol: variable Arrays location: class BlogPost ./com/example/BlogPost.java:34: error: cannot find symbol List httpList = new ArrayList(); ^ symbol: class List location: class BlogPost ./com/example/BlogPost.java:34: error: cannot find symbol List httpList = new ArrayList(); ^ symbol: class ArrayList location: class BlogPost Note: JavaTester.java uses unchecked or unsafe operations. Note: Recompile with -Xlint:unchecked for details. 5 errors

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

import java.io.Serializable;
import java.util.Date;

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> words = Arrays.asList(getWords());
    List <String> httpList = new ArrayList<String>();
    for (String word : words){
      if (word.startsWith("http")) {
        httpList.add(word);
      }
    }
    return httpList;
  }

  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;
  }
}

3 Answers

Iain Diamond
Iain Diamond
29,379 Points

Hi Leen, It looks like you need to include libraries for

import java.util.List;
import java.util.ArrayList;

Hope this helps, iain

Leen Leenaerts
Leen Leenaerts
1,096 Points

thanks it solved most problems but still 1 left:

./com/example/BlogPost.java:23: error: cannot find symbol List words = Arrays.asList(getWords()); ^ symbol: variable Arrays location: class BlogPost Note: JavaTester.java uses unchecked or unsafe operations. Note: Recompile with -Xlint:unchecked for details. 1 error

Iain Diamond
Iain Diamond
29,379 Points

Arrays is another library you'll need to include. Here's a link to the official documentation.

http://docs.oracle.com/javase/7/docs/api/java/util/Arrays.html

People I don't know where I am missing it.I need help on the for each loop. I am getting errors on my getTileCount method, it is saying I forgot to create the method.

~public class ScrabblePlayer { private String mHand;

public ScrabblePlayer() { mHand = ""; }

public String getHand() { return mHand; }

public void addTile(char tile) { // Adds the tile to the hand of the player mHand += tile; }

public boolean hasTile(char tile) { return mHand.indexOf(tile) > -1; } public int getTileCount(){ int counter = 0; for(char letter : mHand.toCharArray()){ counter++; } return counter;

} }