PhoneBook.java

import java.util.*;

public class PhoneBook {

	public static void main(String[] args) {

		Scanner sc = new Scanner(System.in);
		Map<String, String> book = new HashMap<String, String>();

		for (;;) {

			System.out.println(
					"\nWelcome to PhoneBook\n Enter 1 to add contact\n Enter 2 to search contact\n Enter 3 to exit\n");

			int n = sc.nextInt();
			sc.nextLine();

			if (n == 1) {
				System.out.println("Enter name: ");

				String name = sc.nextLine();
				System.out.println("Enter Number: ");
				String number = sc.nextLine();

				book.put(name, number);

				System.out.println("Number " + number + " is saved by name " + name + "\n");
			}

			if (n == 2) {
				System.out.println("Enter name: ");
				String key = sc.nextLine();
				System.out.println("Number: " + book.get(key) + "\n");
			}

			if (n == 3) {
				break;
			}
		}
		sc.close();
	}
}