Quadratic Equation Calculator Client

/*
 * Name: Lu Liu
 * Date: 4/29/2016
 * Course Number: CSC-112
 * Course Name: Intermediate Topics in Java Programming
 * Email: lliu0001@student.stcc.edu
 *
 * Assignment: HW # 16
 * Programe Description:
 * Quadratic Equation Calculator Client
 */

import java.io.*;
import java.net.*;
import javafx.application.Application;
import javafx.geometry.Insets;
import javafx.scene.Scene;
import javafx.scene.control.Button;
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.scene.layout.VBox;
import javafx.stage.Stage;

public class CalculatorClient extends Application {
    // IO streams
    DataOutputStream toServer = null;
    DataInputStream fromServer = null;

    @Override // Override the start method in the Application class
    public void start(Stage primaryStage) {
        // Create pane to hold the label and text field
        BorderPane paneForTextField = new BorderPane();
        paneForTextField.setPadding(new Insets(5, 5, 5, 5));
        paneForTextField.setStyle("-fx-border-color: green");
        TextField tf1 = new TextField();
        TextField tf2 = new TextField();
        TextField tf3 = new TextField();
        Button start = new Button("Start");
        VBox vBox = new VBox(10);
        vBox.setPadding(new Insets(5, 5, 5, 5));
        vBox.getChildren().addAll(new Label("Enter coefficient a: "), tf1, new Label("Enter coefficient b: "), tf2,
                new Label("Enter coefficient c: "), tf3, start);
        paneForTextField.setCenter(vBox);

        // Create pane to hold the paneforTextField and TextArea
        BorderPane mainPane = new BorderPane();
        // Text area to display contents
        TextArea ta = new TextArea();
        mainPane.setCenter(new ScrollPane(ta));
        mainPane.setBottom(paneForTextField);

        // Create a scene and place it in the stage
        Scene scene = new Scene(mainPane, 450, 500);
        primaryStage.setTitle("Client"); // Set the stage title
        primaryStage.setScene(scene); // Place the scene in the stage
        primaryStage.show(); // Display the stage

        start.setOnAction(e -> {
            try {
                // Get the coefficients from the text field
                double coA = Double.parseDouble(tf1.getText().trim());
                double coB = Double.parseDouble(tf2.getText().trim());
                double coC = Double.parseDouble(tf3.getText().trim());
                // Send the coefficients to the server
                toServer.writeDouble(coA);
                toServer.writeDouble(coB);
                toServer.writeDouble(coC);
                toServer.flush();

                // Get results from the server
                // Display to the text area
                ta.appendText("Coefficient A is " + coA + "\n");
                ta.appendText("Coefficient B is " + coB + "\n");
                ta.appendText("Coefficient C is " + coC + "\n");
                int status = fromServer.readInt();
                double root1, root2;

                if (status == 2) {
                    root1 = fromServer.readDouble();
                    root2 = fromServer.readDouble();
                    ta.appendText("Root1 received from the server is " + root1 + '\n');
                    ta.appendText("Root2 received from the server is " + root2 + '\n');
                } else if (status == 1) {
                    root1 = fromServer.readDouble();
                    ta.appendText("Root1 received from the server is " + root1 + '\n');
                } else if (status == 0) {
                    ta.appendText("There is no real root return");
                }

            } catch (IOException ex) {
                System.err.println(ex);
            }
        });

        try {
            // Create a socket to connect to the server
            Socket socket = new Socket("cs.stcc.edu", 5007);
            // Socket socket = new Socket("134.241.96.49", 5007);

            // Create an input stream to receive data from the server
            fromServer = new DataInputStream(socket.getInputStream());

            // Create an output stream to send data to the server
            toServer = new DataOutputStream(socket.getOutputStream());
        } catch (IOException ex) {
            ta.appendText(ex.toString() + '\n');
        }
    }

    /**
     * The main method is only needed for the IDE with limited JavaFX support.
     * Not needed for running from the command line.
     */
    public static void main(String[] args) {
        launch(args);
    }
}