q20
Write the method

void findNumber(HashMap<String,String> numbers)

which prompts the user to enter a name and then searches and 
prints a number from the phone book that matches the name. 
If the name is not found, the program prints an error message according to the model response.

Example of a method call:
public static void main(String[] args){
    HashMap<String,String> numbers = new HashMap<>();
    numbers.put("Tim", "12345");
    numbers.put("Kate", "54321");
    numbers.put("Jun", "55555");

    findNumber(numbers);
    findNumber(numbers);
    findNumber(numbers);
}



Example execution:
Name: Tim
Number: 12345
Name: Kate
Number: 54321
Name: Patricia
Name not found
 
 
 
 
 
 
import java.util.Random;
import java.util.Arrays;
import java.util.HashMap;
import java.util.Collections;
import java.util.ArrayList;
import java.util.Scanner;



public class Test{
    public static void main(String[] args){
        final Random r = new Random();

            findNumber(numbers);
    }


    //q20
    public static void findNumber(HashMap<String,String> numbers) {
        // Let  user enter a name
        Scanner reader = new Scanner(System.in);
        System.out.print("Name: ");
        String name = reader.nextLine();

        // then find the name and their number
        if (numbers.containsKey(name)) {
            System.out.println("Number: " + numbers.get(name));
        } 
        else {
            System.out.println("Name not found");
        }
    }

    
    
}








Phone book: 
Kim: 39652
Lena: 289930
Pete: 769067
Testing with input [Pete]
Name: Pete
Number: 769067

Testing with input [Jane]
Name: Jane
Name not found

Testing with input [Kim]
Name: Kim
Number: 39652

Testing with input [Lena]
Name: Lena
Number: 289930