import java.io.*;

import java.net.*;

import javafx.application.Application;

import javafx.geometry.Insets;

import javafx.geometry.Pos;

import javafx.scene.Scene;

import javafx.scene.control.Label;

import javafx.scene.control.ScrollPane;

import javafx.scene.control.TextArea;

import javafx.scene.control.TextField;

import javafx.scene.layout.BorderPane;

import javafx.stage.Stage;

public class Client extends Application {

DataOutputStream toServer = null;

DataInputStream fromServer = null;

@Override

public void start(Stage primaryStage) {

BorderPane paneForTextField = new BorderPane();

paneForTextField.setPadding(new Insets(5, 5, 5, 5));

paneForTextField.setStyle("-fx-border-color: green");

paneForTextField.setLeft(new Label("Enter a radius: "));

TextField tf = new TextField();

tf.setAlignment(Pos.BOTTOM_RIGHT);

paneForTextField.setCenter(tf);

BorderPane mainPane = new BorderPane();

TextArea ta = new TextArea();

mainPane.setCenter(new ScrollPane(ta));

mainPane.setTop(paneForTextField);

Scene scene = new Scene(mainPane, 450, 200);

primaryStage.setTitle("Client");

primaryStage.setScene(scene);

primaryStage.show();

tf.setOnAction(e -> {

try {

double radius = Double.parseDouble(tf.getText().trim());

toServer.writeDouble(radius);

toServer.flush();

double area = fromServer.readDouble();

ta.appendText("Radius is: " + radius + "\n");

ta.appendText("Area received from the server is " + area + '\n');

}

catch (IOException ex) {

System.err.println(ex);

}

});

try {

Socket socket = new Socket("localhost", 8000);

fromServer = new DataInputStream(socket.getInputStream());

toServer = new DataOutputStream(socket.getOutputStream());

}

catch (IOException ex) {

ta.appendText(ex.toString() + '\n');

}

}

}