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

how do i return this methodname?

For this task, let's fix the getContactInfo method

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

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

  /**
   * 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.
    return mContactMethods.keySet();
  }

  /**
   * 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*
    return  Pager;
  }

  public String getFirstName() {
    return mFirstName;
  }

  public String getLastName() {
    return mLastName;
  }

}

am i supposed to input the value that is to be returned

2 Answers

Harry James
Harry James
14,078 Points

Hey Admire!

Put simply, you want to get the value of methodName (Which is the key) in the mContactMethods HashMap.

I'm going to leave this as a very basic explanation just so that you understand what the question is asking but, if you have any troubles with understanding what to do still, I'll help you out a bit more.

Hope it helps :)

i think got what the question wants the method name in the mContactMethods isn't it pager. But its not working.

Khaleel Yusuf
Khaleel Yusuf
13,531 Points

I still do not understand

Harry James
Harry James
14,078 Points

Hi Khaleel Yusuf,

Here's a hint - it's the get() method you want to call from the mContactMethods HashMap. We can check the Java documentation for this method.

In this example, the parameter to get() will be methodName, which is the key.

Let me know if this helps and if not, give me a shout back with the code that you're trying and I'll help you from there :)

Khaleel Yusuf
Khaleel Yusuf
13,531 Points

The code is supposed to be like: mContactMethods.get(methodName); right?

Harry James
Harry James
14,078 Points

That sounds good to me! Does it pass the challenge?