Write an application that allows a user to enter the names and birthdates of up to 10 friends. Continue to prompt the user for names and birthdates until the user enters the sentinel value ZZZ for a name or has entered 10 names, whichever comes first. When the user is finished entering names, produce a count of how many names were entered, and then display the names. In a loop, continuously ask the user to type one of the names and display the corresponding birthdate or an error message if the name has not been previously entered. The loop continues until the user enters ZZZ for a name. Save the application as BirthdayReminder. java.

import java.util.Scanner;

public class BirthdayChecker

{

   public static void main(String[] args)

   {

       String sentinelValue = "ZZZ";

       final int size = 10;

       int count = 0;

       String name = null;

       String dateOfBirth = null;

       String[] namesArray = new String[size];

       String[] dateOfBirthsArray = new String[size];

     Scanner scanner = new Scanner(System.in);

       System.out.println("Enter name or enter ZZZ " +  "to quit");

       name = scanner.nextLine();

       while(!name.equals(sentinelValue) && count < 10)

       {

           System.out.println("Enter date of birth " +  "(dd-mm-)");

           dateOfBirth=scanner.nextLine();

           namesArray[count] = name;

           dateOfBirthsArray[count] = dateOfBirth;

           System.out.println("Enter name or enter " +

           "ZZZ to quit");

           name=scanner.nextLine();

           count++;

       }

       System.out.println("Count of namesArray = "+count);

       System.out.println("The entered namesArray are:");

       for(int i = 0; i < count; i++)  

       {

           System.out.println(namesArray[i]);

       }

       boolean criteria = true;

       boolean flag = false;

       while(criteria)

       {

           System.out.println("Enter name to " +

           "display date of birth or enter " +

           "ZZZ to quit");

           name = scanner.nextLine();

           if(name.equals(sentinelValue))

               criteria = false;

           else

           {

               for(int i = 0; i < count && !flag;

               i++)

               {

                   if(namesArray[i].equals(name))

                   {

                       flag = true;

                       dateOfBirth = dateOfBirthsArray[i];

                   }

               }

               if(flag)

               {

                   System.out.println("Date of Birth "

                   + "of " + name + " is "

                   + dateOfBirth);

               }

               else

               {

                   System.out.println("Date Of Birth "

                   + "of " + name + " is not flag");

               }

           }

           flag = false;

       }

   }

}

Explanation: