Java Java Data Structures Efficiency! Using a Map to store Contact Methods

Damjan Vlaic
Damjan Vlaic
19,241 Points

---JAVA---

I need to fix getContactInfo method, the instruction are commented, pls someone help

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

import java.util.HashSet;
import java.util.Map;
import java.util.Set;
import java.util.HashMap;

public class Contact {
  private String mFirstName;
  private String mLastName;
  private Map<String, String> mContactMethods;

  public Contact(String firstName, String lastName) {
    mFirstName = firstName;
    mLastName = lastName;
    /* This stores contact methods by name
     * eg:  "phone" => "(555) 555-1234"
     */
    mContactMethods = new HashMap<String, String>();
  }

  public void addContactMethod(String method, String value) {
    // TODO: Add to the contact method map
    mContactMethods.put(method, value);
  }

  /**
   * Returns the available contact methods.  eg: phone, pager,
   *
   * @return The name of the contact methods that are available
   */
  public Set<String> getAvailableContactMethods() {
    // FIXME: This should return the current contact method names.
    Set<String> availableContacts = new HashSet<String>();
    for (String name : mContactMethods.keySet()) {  // <---error is on this line
      availableContacts.add(name);
    }
    return availableContacts;
  }

  /**
   * Returns the value for the contact method if it exists, 
   *
   * @param methodName  The name of the contact method to look up.
   * @return The name of the contact methods that are available
   */
  public String getContactInfo(String methodName) {
    // FIXME: return the value for the passed in *methodName*
  }

  public String getFirstName() {
    return mFirstName;
  }

  public String getLastName() {
    return mLastName;
  }

}

1 Answer

Steve Hunter
MOD
Steve Hunter
Treehouse Moderator 57,551 Points

Hi there,

Use the get method on mContactMethods using dot notation and pass in the argument, methodName.

Steve.

Damjan Vlaic
Damjan Vlaic
19,241 Points

ahha i get it now, tnx for helping steve :)