ClientAppTest.java

import java.awt.Font;
import java.io.*;
import java.net.*;
import java.util.Scanner;

import javax.swing.*;

public class ClientAppTest {
    public static void main(String[] args) {
        String serverAddress = "localhost";
        int portNumber = 12345;

        Scanner s = new Scanner(System.in);
        System.out.println("Input port");
        int port = s.nextInt();
        s.close();

        Thread inputThread = new Thread(() -> {
            ServerAppTest serverApp = new ServerAppTest();
            serverApp.Connect(port);
        });
            inputThread.start();
        try (Socket clientSocket = new Socket(serverAddress, port);
             PrintWriter writer = new PrintWriter(clientSocket.getOutputStream(), true);
             BufferedReader reader = new BufferedReader(new InputStreamReader(clientSocket.getInputStream()))) {

            System.out.println("Connected to server");

            JFrame frame = new JFrame("Client");
            frame.setSize(1000, 1000);
            frame.setLayout (null);
            

            JLabel chatText = new JLabel ("Chat");
            JTextArea incomingMessages = new JTextArea("newLabel");
            JTextArea outgoingMessages = new JTextArea (5, 5);
            JButton sendButton = new JButton ("Send");

            incomingMessages.setEditable(false);
            outgoingMessages.setToolTipText ("Send");

            chatText.setBounds (295, 35, 210, 85);

            chatText.setFont (new Font("Arial", Font.BOLD, 20));

            incomingMessages.setBounds (10, 55, 340, 430);
            outgoingMessages.setBounds (375, 60, 195, 385);
            sendButton.setBounds (410, 465, 100, 25);

            frame.add(chatText);
            frame.add(incomingMessages);
            frame.add(outgoingMessages);
            frame.add(sendButton);

            frame.setVisible(true);

            incomingMessages.setText(reader.readLine());
            sendButton.addActionListener(e -> {
                String text = outgoingMessages.getText();
                writer.println(text);
                outgoingMessages.setText("");

                if (incomingMessages.getText().equals("Please enter your username:")) {
                    incomingMessages.setText("Sucessfully singed up as: " + text + "! Enjoy the chat!");
                }
            });

            String message;
            while ((message = reader.readLine()) != null) {
                    System.out.println(message);
                    incomingMessages.setText(incomingMessages.getText() + "\n" + message);
                    frame.repaint();
            }

          /* 
            Scanner scanner = new Scanner(System.in);
            System.out.println(reader.readLine()); // Server prompt for username
            String username = scanner.nextLine();
            writer.println(username); // Send the username to the server

            Thread inputThread = new Thread(() -> {
                while (true) {
                    String message = scanner.nextLine();
                    writer.println(message);
                }
            });
            inputThread.start();

            String message;
            while ((message = reader.readLine()) != null) {
                System.out.println(message);
            }
            */

        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}