getAddressBookSimple.java

/**
AddressBook is a model for how to store the address or phone number for individuals.
*/
class AddressBook {
  
  private Map<String, String> map;

  public AddressBook(Map<String, String> map) {
    this.map = map;
  }
  
  /**
    sample code that creates an AddressBook using a Map<String, String> as input.
    Usage:
      abook = AddressBook.makeSimple();
      phoneNumber = abook.get("Ava"); // (415)-730-xxxx
  */
  static AddressBook makeSimple() {
    Map<String, String> map = new HashMap<>();
    map.put("Ava", "(415)-730-xxxx");
    map.put("Bob", "(512)-349-xxxx");
    map.put("Carl", "(917)-123-xxxx");
    // use the constructor to create the AddressBook
    return new AddressBook(map);
  }
  
  public String get(String name) {
    // reference the internal map data structure to get the result
    return this.map.get(name);
  }
}