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Commit ff55044

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bug fix ex 31 02
1 parent b96297e commit ff55044

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‎README.md

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<img style="width:25%; height:25%;" src="./resources/coverpicture.png" alt="header-img-book-cover">
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### This repo contains my solutions to the end-of-chapter exercise’s from <a href="https://www.amazon.com/Intro-Java-Programming-Comprehensive-Version/dp/0133761312">Y. Daniel Liang’s Intro to Java Programming (10th Edition)</a>
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### This repo contains <ahref="#exercise-solutions-shortcut">my solutions to the end-of-chapter exercise’s</a> from <a href="https://www.amazon.com/Intro-Java-Programming-Comprehensive-Version/dp/0133761312">Y. Daniel Liang’s Intro to Java Programming (10th Edition)</a>
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### I've included links below to all the freely accessible compainion material and quick links to navigate through my solutions by chapter.
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### I've included links below to all the freely accessible companion material and quick links to navigate through my solutions by chapter.
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### If you would like to contribute, please see: <a href="#contribute">Ways to Contribute</a>
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____
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<h1>Exercise Solutions:</h1>
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<h1id="exercise-solutions-shortcut">Exercise Solutions:</h1>
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<h5>Quick Links to navigate these solutions by chapter</h5>
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<h6>
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<img src="./resources/images/icons8-complete-26.png" alt="complete-check-img"/>

‎ch_18/exercise18_31/Exercise18_31.class

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‎ch_31/Exercise31_02.java

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‎ch_31/exercise31_02/BmiDto.java

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package ch_31.exercise31_02;
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/**
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* Data Transfer Object for BMI data
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* <p>
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* This class is used to transfer data from the client to the server.
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* For Exercise31_02, the client sends the weight and height for a person to the server.
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*/
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public class BmiDto {
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private double weight;
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private double height;
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public BmiDto() {
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}
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public BmiDto(double weight, double height) {
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this.weight = weight;
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this.height = height;
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}
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public double getWeight() {
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return weight;
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}
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public double getHeight() {
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return height;
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}
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}

‎ch_31/exercise31_02/Exercise31_02.java

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package ch_31.exercise31_02;
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import javafx.application.Application;
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import javafx.application.Platform;
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import javafx.stage.Stage;
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/**
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* *31.2 (BMI server) Write a server for a client. The client sends the weight and
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* height for a person to the server (see Figure 31.18a). The server computes
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* BMI (Body Mass Index) and sends back to the client a string that reports the
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* BMI (see Figure 31.18b). See Section 3.8 for computing BMI. Name the client
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* Exercise31_02Client and the server Exercise31_02Server.
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*/
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public class Exercise31_02 extends Application {
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@Override
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public void start(Stage primaryStage) throws Exception {
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System.out.println("##-_-_--_--_--__-_-- Starting: Exercise31_02 --_-__--__--__--_--_--##");
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Platform.runLater(() -> new Exercise31_02Server().start(new Stage()));
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Platform.runLater(() -> new Exercise31_02Client().start(new Stage()));
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}
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}
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package ch_31.exercise31_02;
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import javafx.application.Application;
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import javafx.event.ActionEvent;
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import javafx.event.EventHandler;
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import javafx.geometry.HPos;
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import javafx.geometry.Pos;
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import javafx.geometry.VPos;
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import javafx.scene.Scene;
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import javafx.scene.control.Button;
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import javafx.scene.control.Label;
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import javafx.scene.control.TextArea;
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import javafx.scene.control.TextField;
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import javafx.scene.layout.GridPane;
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import javafx.stage.Stage;
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import java.io.*;
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import java.net.Socket;
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public class Exercise31_02Client extends Application {
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private TextField weightTextInput = new TextField();
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private TextField heightTextInput = new TextField();
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private TextArea displayResultTextArea = new TextArea();
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private Button submitButton = new Button("Submit");
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// Host name or ip
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String host = "localhost";
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private ObjectOutputStream toServer;
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private DataInputStream fromServer;
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public Exercise31_02Client() {
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System.out.println("##-_-_--_--_--__-_-- Starting: Exercise31_02Client --_-__--__--__--_--_--##");
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}
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@Override
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public void start(Stage primaryStage) {
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Stage stage = new Stage();
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GridPane pane = new GridPane();
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pane.add(new Label("Weight in pounds"), 0, 0);
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pane.add(weightTextInput, 1, 0);
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pane.add(new Label("Height in inches"), 0, 1);
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pane.add(heightTextInput, 1, 1);
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pane.add(submitButton, 1, 3);
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pane.add(displayResultTextArea, 1, 4);
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GridPane.setHalignment(submitButton, HPos.RIGHT);
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GridPane.setValignment(displayResultTextArea, VPos.BOTTOM);
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pane.setAlignment(Pos.CENTER);
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weightTextInput.setPrefColumnCount(15);
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heightTextInput.setPrefColumnCount(15);
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submitButton.setOnAction(new ButtonListener());
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Scene scene = new Scene(pane, 450, 200);
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stage.setTitle("BMI Client");
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stage.setScene(scene);
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stage.show();
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try (Socket socket = new Socket(host, 8000)) {
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// Create an output stream to the server
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toServer = new ObjectOutputStream(socket.getOutputStream());
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// Create an input stream from the server
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fromServer = new DataInputStream(socket.getInputStream());
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} catch (IOException ex) {
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System.out.println("##----------- Client Error: IOException: " + ex.getMessage() + " -----------##");
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}
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}
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/**
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* Custom event handler for the submit button
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*/
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private class ButtonListener implements EventHandler<ActionEvent> {
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@Override
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public void handle(ActionEvent e) {
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try {
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// Get weight and height from the text fields
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double weight = Double.parseDouble(weightTextInput.getText().trim());
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double height = Double.parseDouble(heightTextInput.getText().trim());
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// Create a BmiDto and send to the server
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BmiDto s = new BmiDto(weight, height);
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toServer.writeObject(s);
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toServer.flush();
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// Get resulting BMI from the server
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double bmi = fromServer.readDouble();
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// Display to the text area
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displayResultTextArea.setText("Weight: " + weight + "\nHeight: " + height + "\nBMI is: " + bmi
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+ "\n" + getCategory(bmi));
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} catch (IOException ex) {
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System.out.println("##----------- Client Error: IOException: " + ex.getMessage() + " -----------##");
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}
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}
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}
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private String getCategory(double bmi) {
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if (bmi < 18.5) {
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return "Underweight";
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} else if (bmi < 25) {
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return "Normal";
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} else if (bmi < 30) {
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return "Overweight";
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} else {
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return "Obese";
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}
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}
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}
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package ch_31.exercise31_02;
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import javafx.application.Application;
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import javafx.application.Platform;
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import javafx.scene.Scene;
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import javafx.scene.control.ScrollPane;
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import javafx.scene.control.TextArea;
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import javafx.stage.Stage;
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import java.io.*;
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import java.net.ServerSocket;
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import java.net.Socket;
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import java.util.Date;
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import java.util.Objects;
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import java.util.concurrent.atomic.AtomicBoolean;
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public class Exercise31_02Server extends Application {
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private static final double KILOGRAMS_PER_POUND = 0.45359237;
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private static final double METERS_PER_INCH = 0.0254;
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private AtomicBoolean isRunning = new AtomicBoolean(true);
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public Exercise31_02Server() {
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System.out.println("##-_-_--_--_--__-_-- Starting: Exercise31_02Server --_-__--__--__--_--_--##");
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}
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@Override
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public void start(Stage primaryStage) {
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TextArea displayLogTextArea = new TextArea();
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Scene scene = new Scene(new ScrollPane(displayLogTextArea), 450, 200);
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primaryStage.setTitle("TicTacToeServer");
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primaryStage.setScene(scene);
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primaryStage.show();
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new Thread(() -> runServer(displayLogTextArea)).start();
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}
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private void runServer(TextArea displayLogTextArea) {
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/* Create a server socket. Use try with resources to close the socket automatically */
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try (ServerSocket serverSocket = new ServerSocket(8000)) {
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// Listen for a connection request
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Socket socket = socket = serverSocket.accept();
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// Create data input and output streams
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try (ObjectInputStream inputFromClient = new ObjectInputStream(
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socket.getInputStream())) {
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try (DataOutputStream outputToClient = new DataOutputStream(
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socket.getOutputStream())) {
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Platform.runLater(() -> displayLogTextArea.appendText(new Date() +
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": Server started at socket 8000\n"));
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while (true) {
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if (!isRunning.get()) {
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break;
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}
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if (inputFromClient.available() > 0) {
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// Receive Object from the client
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Object object = inputFromClient.readObject();
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if (Objects.nonNull(object) && object instanceof BmiDto) {
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BmiDto bmiDto = (BmiDto) object;
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double weight = bmiDto.getWeight();
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double height = bmiDto.getHeight();
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double bmi = calculateBmi(weight, height);
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// Send area back to the client
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outputToClient.writeDouble(bmi);
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}
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}
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}
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}
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}
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} catch (ClassNotFoundException | IOException ex) {
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System.out.println("##----------- Server Error: Exception: " + ex.getMessage() + " -----------##");
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}
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}
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private double calculateBmi(double weight, double height) {
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double weightInKilograms = weight * KILOGRAMS_PER_POUND;
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double heightInMeters = height * METERS_PER_INCH;
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return weightInKilograms /
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(heightInMeters * heightInMeters);
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}
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}

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