ZCW-PhoneBook/PhoneBook1.java

                                     
/**
 * Write a description of class PhoneBook1 here.
 *
 * @author (your name)
 * @version (a version number or a date)
 */
import java.util.TreeMap;
import java.util.*;
import java.util.Scanner;
public class PhoneBook1
{
    // instance variables - replace the example below with your own
    private String name, number;
    
    private Map<String, String> entries ;
    

    /**
     * Constructor for objects of class PhoneBook1
     */
    public PhoneBook1(){        
        this.entries = new TreeMap<String, String>();
    }

    /**
     * An example of a method - replace this comment with your own
     *
     * @param  y  a sample parameter for a method
     * @return    the sum of x and y
     */
    public void addNumber(String name, String number){
        this.entries.put(name, number);
        
    }

    public void remove(String name){
        if (this.entries.containsKey(name))
            System.out.println("found it");
        this.entries.remove(name);
    }

    public void display(){
        if (this.entries.isEmpty()) System.out.println("Empty");
        for (Map.Entry<String, String> entry : entries.entrySet()) {
        String value = entry.getValue();
        String key = entry.getKey();
        System.out.println(key + " " + value);
        }
        

        

    }
}