/**
 * Created by leon on 1/23/18.
 */
import java.util.TreeMap;
import java.util.Map;
public class PhoneBook {
    String name;
    String phoneNumber;
    Map<String, String> entries = new TreeMap<String, String>();
    
    public void add(String name, String phoneNumber) {
        entries.put(name, phoneNumber);
    }
    
    public void remove(String name) {
        entries.remove(name);
    }
    
    public String lookUp(String name) {
        return entries.get(name);
    }
    
    public String reverseLookUp(String phoneNumber) {
        return entries.get(phoneNumber);
    }
    
    public void phoneNumberDisplay() {
        System.out.println(entries.values().toString());
    }
    
    public static void main(String[] args) {
        PhoneBook phonebook = new PhoneBook();
        phonebook.add("Jason", "302-444-6789");
        phonebook.add("Bill", "302-555-6543");
        phonebook.add("Johnny", "302-345-8901");
        phonebook.add("Andre", "302-231-4738");
        phonebook.add("Jerry", "302-565-5778");
        System.out.println(phonebook.lookUp("Jason"));
        phonebook.phoneNumberDisplay();
        
    }
}