import java.util.NoSuchElementException;
import java.util.Scanner;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;

/**
* SocialClient is a toy application for simulating the connections between profiles in an
* asymmetric (i.e., following) social network. It is a client of the Set and Profile classes.
*/
public class SocialClient {
// a set to store the profiles in the system
private static SetInterface<ProfileInterface> profiles = new Set<ProfileInterface>();
// a scanner to get input from the user
private static Scanner input = new Scanner(System.in);

/**
* Runs the toy social media application.
*
* Attempts to restore data from previous runs, if possible.
*/
public static void main(String args[]) {
   restore();
   int selection = -1;

   while (selection != 0) {
         System.out.println();
         System.out.println("Social Client Main Menu");
         System.out.println("1. List profiles");
         System.out.println("2. Create a profile");
         System.out.println("3. Show a profile");
         System.out.println("4. Edit a profile");
         System.out.println("5. Follow");
         System.out.println("6. Unfollow");
         System.out.println("7. Recommend someone to follow");
         System.out.println("0. Quit");
         System.out.print("Selection: ");

         try {
            selection = input.nextInt();
         } catch (NoSuchElementException e) {
            selection = -1;
         } catch (IllegalStateException e) {
            selection = -1;
         }
         input.nextLine();

         switch (selection) {
            case 1:
               list();
               break;
            case 2:
               create();
               break;
            case 3:
               show();
               break;
            case 4:
               edit();
               break;
            case 5:
               follow();
               break;
            case 6:
               unfollow();
               break;
            case 7:
               recommend();
               break;
            case 0:
               save();
               break;
            default:
               // Invalid, just ignore and let loop again
               break;
         }
   }
}

/**
* Attempts to restore the program state from SocialClientData.bin
*/
@SuppressWarnings("unchecked")
static void restore() {
try {
ObjectInputStream restoreStream =
               new ObjectInputStream(new FileInputStream("SocialClientData.bin"));
profiles = (SetInterface<ProfileInterface>)restoreStream.readObject();
}
catch(FileNotFoundException e) {
// File does not exist, no warning
}
catch(IOException e) {
// Couldn't read file properly
         System.out.println("Warning: Could not restore from existing data");
}
catch(ClassNotFoundException e) {
// Couldn't cast to correct type
         System.out.println("Warning: Could not restore from existing data");
}
}

/**
* Attempts to save the program s

Suppose that your work for a beverage company. The Company wants to...