SimpleClient.java

import java.io.DataInputStream;
import java.io.DataOutputStream;
import java.io.IOException;
import java.util.Scanner;
import accountType.Account;
import java.io.ObjectInputStream;
import java.net.InetAddress;
import java.net.Socket;

public class SimpleClient {

	public static void main(String[] args) {
		Scanner scanner = new Scanner(System.in);
		int userSelction = -1;

		Socket clientSocket; // TCP/IP socket

		try {
			clientSocket = new Socket(InetAddress.getByName("localhost"), Integer.parseInt(args[0]));
			DataInputStream dataIn = new DataInputStream(clientSocket.getInputStream());
			DataOutputStream dataOut = new DataOutputStream(clientSocket.getOutputStream());
			ObjectInputStream recvObj = new ObjectInputStream(clientSocket.getInputStream());
			System.out.println("Connected to " + clientSocket.getInetAddress().getHostName());

			String bankMessage = dataIn.readUTF();
			System.out.println(bankMessage);

			String username = scanner.nextLine();
			dataOut.writeUTF(username);
			dataOut.flush();
			
			//main loop
			do {
				
				bankMessage = dataIn.readUTF();
				System.out.println(bankMessage);
				userSelction = scanner.nextInt();
				scanner.nextLine();//flush out \n
				
				dataOut.writeInt(userSelction);
				dataOut.flush();

				switch (userSelction) {
				case 1:
					Account accList[] = (Account[]) recvObj.readObject();
					System.out
							.println("information about ALL accounts received, displayed LINE BY LINE as seen below:");
					printAccounts(accList);
					break;
				case 2:
					System.out.println("# question from the server: " + dataIn.readUTF());
					
					dataOut.writeUTF(scanner.nextLine());
					dataOut.flush();
					
					Account accList1[] = (Account[]) recvObj.readObject();
					printAccounts(accList1);
					
					break;
				case 0:
					System.out.println("Thank You!");
					break;
					
				default:
					System.out.println("Invalid Input!");
					break;
				}
			} while (userSelction != 0);
			
			dataOut.close();
			dataIn.close();
			recvObj.close();
			clientSocket.close();
		} catch (IOException | ClassNotFoundException ioe) {
			ioe.printStackTrace();
		}

		System.out.println("the client is going to stop runing...");
		scanner.close();
	} // end main

	private static void printAccounts(Account[] accList) {
		int count = 0;
		try {
			for (Account account : accList) {
				System.out.println((++count) +".   "+ account.getAccountNumber()+", "+account.getFullName()+", $"+account.getAccountBalance());
			}
		}catch (Exception e) {
			System.out.print("Invalid Input!");
		}
		

	}
}