Given names and phone numbers, assemble a phone book that maps friends' names to their respective phone numbers. You will then be given an unknown number of names to query your phone book for; for each name queried, print the associated entry from your phone book (in the form name=phonenumber ) or NOT FOUND if there is no entry for .name

phonebook.java

//Day8
import java.util.*;
import java.io.*;

class Solution{
    public static void main(String []argh)
    {
       Map<String,Long> phonebook = new java.util.HashMap<>();
        Scanner in = new Scanner(System.in);
        int n = in.nextInt();
        for(int i = 0; i < n; i++)
        {
            String name = in.next();// to get names i.e keys
            long phone = in.nextLong();// to get numbers i.e values
            phonebook.put(name, phone);
            //System.out.println(phonebook);
        }
        while(in.hasNext())
        {
            String name = in.next();  // to enter key to fetch a specific value
            if(phonebook.containsKey(name)== true)
            {
                System.out.println(name  + "=" +phonebook.get(name));
               
            }else 
            {
                 System.out.println("Not found");                
            }
            
        }
        in.close();
    }
}

thanks