MainProgram.java

import java.util.Scanner;

public class MainProgram {
    
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        
        System.out.println("=================================");
        System.out.println("  Communication Method Selector  ");
        System.out.println("=================================");
        System.out.println("Choose communication method:");
        System.out.println("1. RMI (Remote Method Invocation)");
        System.out.println("2. RPC (Remote Procedure Call)");
        System.out.println("3. WebSocket");
        System.out.print("\nEnter your choice (1, 2, or 3): ");
        
        int choice = scanner.nextInt();
        scanner.nextLine(); // consume newline
        
        System.out.println("\nAre you running:");
        System.out.println("1. Server");
        System.out.println("2. Client");
        System.out.print("\nEnter your choice (1 or 2): ");
        
        int mode = scanner.nextInt();
        scanner.nextLine(); // consume newline
        
        try {
            if (choice == 1) {
                // RMI
                if (mode == 1) {
                    System.out.println("\nStarting RMI Server...\n");
                    HelloServer.main(null);
                } else {
                    System.out.println("\nStarting RMI Client...\n");
                    HelloClient.main(null);
                }
            } else if (choice == 2) {
                // RPC
                if (mode == 1) {
                    System.out.println("\nStarting RPC Server...\n");
                    RPCServer.main(null);
                } else {
                    System.out.println("\nStarting RPC Client...\n");
                    RPCClient.main(null);
                }
            } else if (choice == 3) {
                // WebSocket
                if (mode == 1) {
                    System.out.println("\nStarting WebSocket Server...\n");
                    WebSocketServer.main(null);
                } else {
                    System.out.println("\nStarting WebSocket Client...\n");
                    WebSocketClient.main(null);
                }
            } else {
                System.out.println("Invalid choice!");
            }
        } catch (Exception e) {
            System.err.println("Error: " + e.getMessage());
            e.printStackTrace();
        }
        
        scanner.close();
    }
}