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Java Java Data Structures Efficiency! Add tags to a course

Posted by Gabriel E
Gabriel E
8,916 Points

How do I see if a tag was added to mTags set?

Hi,

I'm on the last part of this challenge, but I really can't figure out how do to what the instructions say. I'm supposed to see if a tag has been added to the mTags method through using hasTag. Here is my code. Hope you can help.

com/example/model/Course.java 
package com.example.model;

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

public class Course {
  private String mTitle;
  private Set<String> mTags;

  public Course(String title) {
    mTags = new TreeSet<>();
    mTags.add(title);
    // TODO: initialize the set mTags
  }

  public void addTag(String tag) {
    mTags = new TreeSet<>();
    mTags.add(tag);
    // TODO: add the tag
  }

  public void addTags(List<String> tags) {
    for (String allTags : tags){
      mTags.add(new String(allTags));
    }
    // TODO: add all the tags passed in
  }

  public boolean hasTag(String tag) {
    // TODO: Return whether or not the tag has been added
    mTags.add(tag);
    return true;

  }

  public String getTitle() {
    return mTitle;
  }

}

1 Answer

Kristian Terziev
Kristian Terziev
28,449 Points
Kristian Terziev
Kristian Terziev
28,449 Points

I noticed you're a bit off with the logic regarding task 2. When you add a tile, you shouldn't reset the current tags. So here're all three methods needed in order to pass tasks 2 and 3:

public void addTag(String tag) {
  mTags.add(tag);
}

public void addTags(List<String> tags) {
  mTags.addAll(tags);
}

public boolean hasTag(String tag) {
  return mTags.contains(tag);
}