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Commit f95e549

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Merge pull request #71 from HarryDulaney/new-solutions
bug fix ex 31 023
2 parents dc8c0c9 + 0c07efd commit f95e549

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3 files changed

+114
-128
lines changed

3 files changed

+114
-128
lines changed

‎ch_31/exercise31_02/Exercise31_02.java

Lines changed: 5 additions & 2 deletions
Original file line numberDiff line numberDiff line change
@@ -15,7 +15,10 @@ public class Exercise31_02 extends Application {
1515
@Override
1616
public void start(Stage primaryStage) throws Exception {
1717
System.out.println("##-_-_--_--_--__-_-- Starting: Exercise31_02 --_-__--__--__--_--_--##");
18-
Platform.runLater(() -> new Exercise31_02Server().start(new Stage()));
19-
Platform.runLater(() -> new Exercise31_02Client().start(new Stage()));
18+
new Thread(() -> {
19+
Platform.runLater(() -> new Exercise31_02Server().start(new Stage()));
20+
Platform.runLater(() -> new Exercise31_02Client().start(new Stage()));
21+
}).start();
22+
2023
}
2124
}
Lines changed: 69 additions & 83 deletions
Original file line numberDiff line numberDiff line change
@@ -1,106 +1,92 @@
11
package ch_31.exercise31_02;
22

33
import javafx.application.Application;
4-
import javafx.event.ActionEvent;
5-
import javafx.event.EventHandler;
6-
import javafx.geometry.HPos;
74
import javafx.geometry.Pos;
8-
import javafx.geometry.VPos;
95
import javafx.scene.Scene;
10-
import javafx.scene.control.Button;
11-
import javafx.scene.control.Label;
12-
import javafx.scene.control.TextArea;
13-
import javafx.scene.control.TextField;
6+
import javafx.scene.control.*;
7+
import javafx.scene.layout.BorderPane;
148
import javafx.scene.layout.GridPane;
159
import javafx.stage.Stage;
1610

17-
import java.io.*;
11+
import java.io.DataInputStream;
12+
import java.io.DataOutputStream;
13+
import java.io.IOException;
1814
import java.net.Socket;
19-
2015
public class Exercise31_02Client extends Application {
21-
private TextField weightTextInput = new TextField();
22-
private TextField heightTextInput = new TextField();
23-
private TextArea displayResultTextArea = new TextArea();
16+
DataOutputStream toServer = null;
17+
DataInputStream fromServer = null;
2418

25-
private Button submitButton = new Button("Submit");
19+
// Text fields for BMI information
20+
private TextField tfWeight = new TextField();
21+
private TextField tfHeight = new TextField();
2622

27-
// Host name or ip
28-
String host = "localhost";
23+
@Override // Override the start method in the Application class
24+
public void start(Stage primaryStage) {
25+
// Main pane
26+
BorderPane pane = new BorderPane();
2927

30-
private ObjectOutputStream toServer;
31-
private DataInputStream fromServer;
28+
// Set text field alignment right
29+
tfWeight.setAlignment(Pos.BASELINE_RIGHT);
30+
tfHeight.setAlignment(Pos.BASELINE_RIGHT);
3231

33-
public Exercise31_02Client() {
34-
System.out.println("##-_-_--_--_--__-_-- Starting: Exercise31_02Client --_-__--__--__--_--_--##");
35-
}
32+
// Create button to send BMI info to server
33+
Button btSubmit = new Button("Submit");
3634

37-
@Override
38-
public void start(Stage primaryStage) {
39-
Stage stage = new Stage();
40-
GridPane pane = new GridPane();
41-
pane.add(new Label("Weight in pounds"), 0, 0);
42-
pane.add(weightTextInput, 1, 0);
43-
pane.add(new Label("Height in inches"), 0, 1);
44-
pane.add(heightTextInput, 1, 1);
45-
pane.add(submitButton, 1, 3);
46-
pane.add(displayResultTextArea, 1, 4);
47-
GridPane.setHalignment(submitButton, HPos.RIGHT);
48-
GridPane.setValignment(displayResultTextArea, VPos.BOTTOM);
49-
pane.setAlignment(Pos.CENTER);
50-
weightTextInput.setPrefColumnCount(15);
51-
heightTextInput.setPrefColumnCount(15);
52-
submitButton.setOnAction(new ButtonListener());
53-
54-
Scene scene = new Scene(pane, 450, 200);
55-
stage.setTitle("BMI Client");
56-
stage.setScene(scene);
57-
stage.show();
58-
59-
try (Socket socket = new Socket(host, 8000)) {
60-
// Create an output stream to the server
61-
toServer = new ObjectOutputStream(socket.getOutputStream());
62-
// Create an input stream from the server
63-
fromServer = new DataInputStream(socket.getInputStream());
64-
} catch (IOException ex) {
65-
System.out.println("##----------- Client Error: IOException: " + ex.getMessage() + " -----------##");
66-
}
67-
}
35+
// Pane to hold BMI information and submit button
36+
GridPane paneForBmiInfo = new GridPane();
37+
paneForBmiInfo.add(new Label("Weight in pounds"), 0, 0);
38+
paneForBmiInfo.add(tfWeight, 1, 0);
39+
paneForBmiInfo.add(new Label("Height in inches"), 0, 1);
40+
paneForBmiInfo.add(tfHeight, 1, 1);
41+
paneForBmiInfo.add(btSubmit, 2, 1);
42+
43+
// Text Area to display contents
44+
TextArea ta = new TextArea();
45+
pane.setTop(paneForBmiInfo);
46+
pane.setCenter(new ScrollPane(ta));
6847

69-
/**
70-
* Custom event handler for the submit button
71-
*/
72-
private class ButtonListener implements EventHandler<ActionEvent> {
73-
@Override
74-
public void handle(ActionEvent e) {
48+
// Create a scene and place it in the stage
49+
Scene scene = new Scene(pane, 400, 200);
50+
primaryStage.setTitle("Exercise31_01Client"); // Set the stage title
51+
primaryStage.setScene(scene); // Place the scene in the stage
52+
primaryStage.show(); // Display the stage
53+
54+
btSubmit.setOnAction(e -> {
7555
try {
76-
// Get weight and height from the text fields
77-
double weight = Double.parseDouble(weightTextInput.getText().trim());
78-
double height = Double.parseDouble(heightTextInput.getText().trim());
79-
// Create a BmiDto and send to the server
80-
BmiDto s = new BmiDto(weight, height);
81-
toServer.writeObject(s);
56+
// Get the weight and height from the text fields
57+
double weight = Double.parseDouble(tfWeight.getText().trim());
58+
double height = Double.parseDouble(tfHeight.getText().trim());
59+
60+
// Send the BMI information to the server
61+
toServer.writeDouble(weight);
62+
toServer.writeDouble(height);
8263
toServer.flush();
83-
// Get resulting BMI from the server
84-
double bmi = fromServer.readDouble();
85-
// Display to the text area
86-
displayResultTextArea.setText("Weight: " + weight + "\nHeight: " + height + "\nBMI is: " + bmi
87-
+ "\n" + getCategory(bmi));
88-
} catch (IOException ex) {
89-
System.out.println("##----------- Client Error: IOException: " + ex.getMessage() + " -----------##");
64+
65+
// Get string from the server
66+
String bmi = fromServer.readUTF();
67+
68+
// Display to text area
69+
ta.appendText("Weight: " + weight + '\n');
70+
ta.appendText("Height: " + height + '\n');
71+
ta.appendText(bmi + '\n');
9072
}
91-
}
92-
}
73+
catch (IOException ex) {
74+
System.err.println(ex);
75+
}
76+
});
9377

94-
private String getCategory(double bmi) {
95-
if (bmi < 18.5) {
96-
return "Underweight";
97-
} else if (bmi < 25) {
98-
return "Normal";
99-
} else if (bmi < 30) {
100-
return "Overweight";
101-
} else {
102-
return "Obese";
78+
try {
79+
// Create a socket to connect to the server
80+
Socket socket = new Socket("localhost", 8000);
81+
82+
// Create an input stream to receive data from the server
83+
fromServer = new DataInputStream(socket.getInputStream());
84+
85+
// Create an output stream to send data to the server
86+
toServer = new DataOutputStream(socket.getOutputStream());
87+
}
88+
catch (IOException ex) {
89+
ta.appendText(ex.toString() + '\n');
10390
}
10491
}
105-
10692
}

‎ch_31/exercise31_02/Exercise31_02Server.java

Lines changed: 40 additions & 43 deletions
Original file line numberDiff line numberDiff line change
@@ -11,67 +11,64 @@
1111
import java.net.ServerSocket;
1212
import java.net.Socket;
1313
import java.util.Date;
14-
import java.util.Objects;
15-
import java.util.concurrent.atomic.AtomicBoolean;
14+
1615

1716
public class Exercise31_02Server extends Application {
1817
private static final double KILOGRAMS_PER_POUND = 0.45359237;
1918
private static final double METERS_PER_INCH = 0.0254;
2019

21-
private AtomicBoolean isRunning = new AtomicBoolean(true);
22-
23-
public Exercise31_02Server() {
24-
System.out.println("##-_-_--_--_--__-_-- Starting: Exercise31_02Server --_-__--__--__--_--_--##");
25-
}
26-
27-
2820
@Override
2921
public void start(Stage primaryStage) {
3022
TextArea displayLogTextArea = new TextArea();
3123
Scene scene = new Scene(new ScrollPane(displayLogTextArea), 450, 200);
3224
primaryStage.setTitle("TicTacToeServer");
3325
primaryStage.setScene(scene);
3426
primaryStage.show();
35-
new Thread(() -> runServer(displayLogTextArea)).start();
36-
}
27+
new Thread(() -> {
28+
try {
29+
ServerSocket serverSocket = new ServerSocket(8000);
30+
Platform.runLater(() ->
31+
displayLogTextArea.appendText("Exercise31_02Server started at "
32+
+ new Date() + '\n'));
3733

38-
private void runServer(TextArea displayLogTextArea) {
39-
/* Create a server socket. Use try with resources to close the socket automatically */
40-
try (ServerSocket serverSocket = new ServerSocket(8000)) {
41-
// Listen for a connection request
42-
Socket socket = socket = serverSocket.accept();
43-
// Create data input and output streams
44-
try (ObjectInputStream inputFromClient = new ObjectInputStream(
45-
socket.getInputStream())) {
46-
try (DataOutputStream outputToClient = new DataOutputStream(
47-
socket.getOutputStream())) {
34+
Socket socket = serverSocket.accept();
35+
DataInputStream inputFromClient = new DataInputStream(
36+
socket.getInputStream());
37+
DataOutputStream outputToClient = new DataOutputStream(
38+
socket.getOutputStream());
4839

49-
Platform.runLater(() -> displayLogTextArea.appendText(new Date() +
50-
": Server started at socket 8000\n"));
51-
while (true) {
52-
if (!isRunning.get()) {
53-
break;
54-
}
55-
if (inputFromClient.available() > 0) {
56-
// Receive Object from the client
57-
Object object = inputFromClient.readObject();
58-
if (Objects.nonNull(object) && object instanceof BmiDto) {
59-
BmiDto bmiDto = (BmiDto) object;
60-
double weight = bmiDto.getWeight();
61-
double height = bmiDto.getHeight();
62-
double bmi = calculateBmi(weight, height);
63-
// Send area back to the client
64-
outputToClient.writeDouble(bmi);
65-
}
66-
}
40+
while (true) {
41+
Date date = new Date();
42+
double weight = inputFromClient.readDouble();
43+
double height = inputFromClient.readDouble();
44+
double weightInKilograms = weight * KILOGRAMS_PER_POUND;
45+
double heightInMeters = height * METERS_PER_INCH;
46+
double bmi = calculateBmi(weightInKilograms, heightInMeters);
47+
StringBuilder bmiString = new StringBuilder("BMI is " +
48+
String.format("%.2f", bmi) + ". ");
6749

50+
if (bmi < 18.5) {
51+
bmiString.append("Underweight");
52+
} else if (bmi < 25) {
53+
bmiString.append("Normal");
54+
} else if (bmi < 30) {
55+
bmiString.append("Overweight");
56+
} else {
57+
bmiString.append("Obese");
6858
}
59+
outputToClient.writeUTF(bmiString.toString());
60+
61+
Platform.runLater(() -> {
62+
displayLogTextArea.appendText("Connected to a client at " + date + '\n');
63+
displayLogTextArea.appendText("Weight: " + weight + '\n');
64+
displayLogTextArea.appendText("Height: " + height + '\n');
65+
displayLogTextArea.appendText(bmiString.toString() + '\n');
66+
});
6967
}
68+
} catch (IOException ex) {
69+
ex.printStackTrace();
7070
}
71-
72-
} catch (ClassNotFoundException | IOException ex) {
73-
System.out.println("##----------- Server Error: Exception: " + ex.getMessage() + " -----------##");
74-
}
71+
}).start();
7572
}
7673

7774
private double calculateBmi(double weight, double height) {

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