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commit Exercise_31_01 and Exercise_31_02
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‎Chapter_31/exercise_31_01Client/Exercise_31_01Client.java‎

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package exercise_31_01Client;
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import java.io.DataInputStream;
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import java.io.DataOutputStream;
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import java.io.IOException;
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import java.net.Socket;
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import javafx.application.Application;
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import javafx.geometry.Pos;
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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.ScrollPane;
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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.BorderPane;
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import javafx.scene.layout.GridPane;
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import javafx.stage.Stage;
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public class Exercise_31_01Client extends Application {
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private DataInputStream inputFromServer = null;
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private DataOutputStream outputToServer = null;
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@Override
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public void start(Stage primaryStage) {
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BorderPane borderPane = new BorderPane();
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TextArea taStatus = new TextArea();
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borderPane.setCenter(new ScrollPane(taStatus));
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GridPane grid = new GridPane();
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TextField tfRate = new TextField();
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tfRate.setAlignment(Pos.BASELINE_RIGHT);
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tfRate.setPrefColumnCount(10);
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TextField tfYears = new TextField();
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tfYears.setAlignment(Pos.BASELINE_RIGHT);
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tfYears.setPrefColumnCount(10);
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TextField tfAmount = new TextField();
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tfAmount.setAlignment(Pos.BASELINE_RIGHT);
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tfAmount.setPrefColumnCount(10);
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Button btSubmit = new Button("Submit");
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grid.add(new Label("Annual Interest Rate"), 0, 0);
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grid.add(tfRate, 1, 0);
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grid.add(new Label("Number Of Years"), 0, 1);
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grid.add(tfYears, 1, 1);
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grid.add(btSubmit, 2, 1);
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grid.add(new Label("Loan Amount"), 0, 2);
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grid.add(tfAmount, 1, 2);
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borderPane.setTop(grid);
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Scene scene = new Scene(borderPane, 300, 200);
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primaryStage.setTitle("Exercise_31_01Client");
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primaryStage.setScene(scene);
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primaryStage.show();
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try {
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Socket socket = new Socket("localhost", 8000);
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inputFromServer = new DataInputStream(socket.getInputStream());
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outputToServer = new DataOutputStream(socket.getOutputStream());
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}
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catch (IOException ex) {
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taStatus.appendText(ex.toString() + "\n");
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}
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btSubmit.setOnAction(e -> {
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try {
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double interestRate = Double.parseDouble(tfRate.getText().trim());
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int numberOfYears = Integer.parseInt(tfYears.getText().trim());
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double amount = Double.parseDouble(tfAmount.getText().trim());
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outputToServer.writeDouble(interestRate);
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outputToServer.writeInt(numberOfYears);
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outputToServer.writeDouble(amount);
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taStatus.appendText("Annual interest rate: " + interestRate + "\n" +
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"Number of Years: " + numberOfYears + "\n" + "Loan amount: " + amount + "\n");
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double monthlyPayment = inputFromServer.readDouble();
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double totalPayment = inputFromServer.readDouble();
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taStatus.appendText("monthlyPayment: " + monthlyPayment + "\n" +
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"totalPayment: " + totalPayment + "\n");
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}
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catch (IOException ex) {
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System.err.println(ex);
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}
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});
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}
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public static void main(String[] args) {
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launch(args);
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}
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}

‎Chapter_31/exercise_31_01Server/Exercise_31_01Server.java‎

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package exercise_31_01Server;
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import exercise_17_06.Loan;
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import java.io.DataInputStream;
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import java.io.DataOutputStream;
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import java.io.IOException;
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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 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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public class Exercise_31_01Server extends Application {
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@Override
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public void start(Stage primaryStage) {
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TextArea taStatus = new TextArea();
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Scene scene = new Scene(new ScrollPane(taStatus), 400, 150);
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primaryStage.setTitle("Exercise_31_01Server");
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primaryStage.setScene(scene);
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primaryStage.show();
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new Thread(() -> {
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try {
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ServerSocket serverSocket = new ServerSocket(8000);
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Platform.runLater(() -> taStatus.appendText("Exercise_31_01Server started at " + new Date() + "\n"));
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Socket socket = serverSocket.accept();
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Platform.runLater(() -> taStatus.appendText("Connected to a client at " + new Date() + "\n"));
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DataInputStream inputFromClient = new DataInputStream(socket.getInputStream());
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DataOutputStream outputToClient = new DataOutputStream(socket.getOutputStream());
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while(true) {
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double interestRate = inputFromClient.readDouble();
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int numberOfYears = inputFromClient.readInt();
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double amount = inputFromClient.readDouble();
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Platform.runLater(() -> taStatus.appendText("Annual interest rate: " + interestRate + "\n" +
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"Number of Years: " + numberOfYears + "\n" + "Loan amount: " + amount + "\n"));
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Loan loan = new Loan(interestRate, numberOfYears, amount);
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double monthlyPayment = loan.getMonthlyPayment();
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double totalPayment = loan.getTotalPayment();
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outputToClient.writeDouble(monthlyPayment);
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outputToClient.writeDouble(totalPayment);
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Platform.runLater(() -> taStatus.appendText("monthlyPayment: " + monthlyPayment + "\n" +
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"totalPayment: " + totalPayment));
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}
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}
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catch (IOException ex) {
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ex.printStackTrace();
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}
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}).start();
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}
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public static void main(String[] args) {
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launch(args);
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}
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}

‎Chapter_31/exercise_31_02Client/Exercise_31_02Client.java‎

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package exercise_31_02Client;
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import java.io.DataInputStream;
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import java.io.DataOutputStream;
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import java.io.IOException;
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import java.net.Socket;
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import javafx.application.Application;
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import javafx.geometry.Pos;
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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.ScrollPane;
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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.BorderPane;
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import javafx.scene.layout.GridPane;
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import javafx.stage.Stage;
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public class Exercise_31_02Client extends Application {
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private DataInputStream inputFromServer = null;
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private DataOutputStream outputToServer = null;
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@Override
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public void start(Stage primaryStage) {
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BorderPane borderPane = new BorderPane();
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TextArea taStatus = new TextArea();
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borderPane.setCenter(new ScrollPane(taStatus));
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GridPane grid = new GridPane();
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TextField tfWeight = new TextField();
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tfWeight.setAlignment(Pos.BASELINE_RIGHT);
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tfWeight.setPrefColumnCount(10);
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TextField tfHeight = new TextField();
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tfHeight.setAlignment(Pos.BASELINE_RIGHT);
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tfHeight.setPrefColumnCount(10);
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Button btSubmit = new Button("Submit");
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grid.add(new Label("Weight in kgs"), 0, 0);
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grid.add(tfWeight, 1, 0);
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grid.add(new Label("Height in meters"), 0, 1);
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grid.add(tfHeight, 1, 1);
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grid.add(btSubmit, 2, 1);
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borderPane.setTop(grid);
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Scene scene = new Scene(borderPane, 300, 200);
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primaryStage.setTitle("Exercise_31_02Client");
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primaryStage.setScene(scene);
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primaryStage.show();
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try {
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Socket socket = new Socket("localhost", 8000);
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inputFromServer = new DataInputStream(socket.getInputStream());
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outputToServer = new DataOutputStream(socket.getOutputStream());
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}
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catch (IOException ex) {
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taStatus.appendText(ex.toString() + "\n");
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}
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btSubmit.setOnAction(e -> {
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try {
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double weight = Double.parseDouble(tfWeight.getText().trim());
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double height = Double.parseDouble(tfHeight.getText().trim());
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outputToServer.writeDouble(weight);
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outputToServer.writeDouble(height);
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outputToServer.flush();
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taStatus.appendText("Weight: " + weight + "\n" + "Height: " + height + "\n");
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String status = inputFromServer.readUTF();
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taStatus.appendText(status + "\n");
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}
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catch (IOException ex) {
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System.err.println(ex);
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}
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});
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}
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public static void main(String[] args) {
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launch(args);
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}
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}

‎Chapter_31/exercise_31_02Server/Exercise_31_02Server.java‎

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package exercise_31_02Server;
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import java.io.DataInputStream;
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import java.io.DataOutputStream;
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import java.io.IOException;
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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 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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public class Exercise_31_02Server extends Application {
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@Override
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public void start(Stage primaryStage) {
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TextArea taStatus = new TextArea();
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Scene scene = new Scene(new ScrollPane(taStatus), 400, 150);
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primaryStage.setTitle("Exercise_31_02Server");
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primaryStage.setScene(scene);
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primaryStage.show();
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new Thread(() -> {
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try {
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ServerSocket serverSocket = new ServerSocket(8000);
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Platform.runLater(() -> taStatus.appendText("Exercise_31_02Server started at " + new Date() + "\n"));
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Socket socket = serverSocket.accept();
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Platform.runLater(() -> taStatus.appendText("Connected to a client at " + new Date() + "\n"));
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DataInputStream inputFromClient = new DataInputStream(socket.getInputStream());
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DataOutputStream outputToClient = new DataOutputStream(socket.getOutputStream());
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while(true) {
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double weight = inputFromClient.readDouble();
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double height = inputFromClient.readDouble();
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Platform.runLater(() -> taStatus.appendText("Weight: " + weight + "\n" +
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"Height: " + height + "\n"));
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BodyMassIndex BMI = new BodyMassIndex(weight, height);
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String status = "BMI is " + String.format("%.2f", BMI.bmi) + ". " + BMI.getStatus();
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outputToClient.writeUTF(status);
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Platform.runLater(() -> taStatus.appendText(status + "\n"));
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}
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}
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catch (IOException ex) {
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ex.printStackTrace();
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}
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}).start();
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}
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private class BodyMassIndex {
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double weight;
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double height;
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double bmi;
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public BodyMassIndex(double weight, double height) {
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this.weight = weight;
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this.height = height;
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bmi = weight / (Math.pow(height, 2));
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}
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public String getStatus() {
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if(bmi < 18.5) {
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return "Underweight";
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}
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else if(bmi < 25) {
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return "Normal";
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}
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else if(bmi < 30) {
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return "Overweight";
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}
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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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public static void main(String[] args) {
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launch(args);
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}
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}

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