I have to create an app that takes 2 numbers from the client side sends them to the server then return they're sum

See more:

Java

netbeans

i got some trouble in the general idea of client/server,like as the client i send the numbers to the server,then somehow i need to stop the client program and execute the server and then reverse,i dont understand how to do that.


to explain the code theres an application on a jframe with awt components ,when i click button1 it needs to send data to the server and execute

What I have tried:

private void button1ActionPerformed(java.awt.event.ActionEvent evt) {                                        
        try {
            
            ServerSocket server = new ServerSocket(8888); 
            Socket connectionToTheServer =  new Socket("localhost", 8887);
            OutputStream out = connectionToTheServer.getOutputStream();
            PrintStream ps = new PrintStream(out, true); 
            ps.println(textField1);
            ps.println(textField3);
            InputStream in = connectionToTheServer.getInputStream();
            BufferedReader br = new BufferedReader(new InputStreamReader(in));
            String a = br.readLine();
            JOptionPane.showMessageDialog(null, a);
        } catch (IOException ex) {
            Logger.getLogger(NewJFrame.class.getName()).log(Level.SEVERE, null, ex);
        }
    }                                       

                              
    public static void main(String args[]) throws IOException {
        ServerSocket server = new ServerSocket(8888);
        Socket connectionToTheClient = server.accept();
        NewJFrame.main(args);
        InputStream in = connectionToTheClient.getInputStream();
        BufferedReader br = new BufferedReader(new InputStreamReader(in));
        int nrF = 0;
        int nrS = 0;
        int sum = 0;
        String line = br.readLine();
        nrF = Integer.parseInt(line);
        line = br.readLine();
        nrS = Integer.parseInt(line);
        sum = nrF+nrS;
        OutputStream out = connectionToTheClient.getOutputStream();
PrintStream ps = new PrintStream(out, true); 
ps.println(sum);
}