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import java.io.*;

import java.net.*;

import java.util.*;

import java.awt.*;

import javax.swing.*;

public class Server extends JFrame {

// Text area for displaying contents

private JTextArea jta = new JTextArea();

public static void main(String[] args) {

new Server();

}

public Server() {

// Place text area on the frame

setLayout(new BorderLayout());

add(new JScrollPane(jta), BorderLayout.CENTER);

setTitle("Server");

setSize(500, 300);

setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

setVisible(true); // It is necessary to show the frame here!

try {

// Create a server socket

ServerSocket serverSocket = new ServerSocket(8000);

jta.append("Server started at " + new Date() + '\n');

// Listen for a connection request

Socket socket = serverSocket.accept();

// Create data input and output streams

DataInputStream inputFromClient = new DataInputStream(

socket.getInputStream());

DataOutputStream outputToClient = new DataOutputStream(

socket.getOutputStream());

while (true) {

// Receive radius from the client

double radius = inputFromClient.readDouble();

// Compute area

double area = radius * radius * Math.PI;

// Send area back to the client

outputToClient.writeDouble(area);

jta.append("Radius received from client: " + radius + '\n');

jta.append("Area found: " + area + '\n');

}

}

catch(IOException ex) {

System.err.println(ex);

}

}

}