This is a java question and the GUI must be done using JavaFX. Please don\'t not
ID: 3665905 • Letter: T
Question
This is a java question and the GUI must be done using JavaFX. Please don't not use java awt. The question comes form intro to java by liang.
I have posted an example, finding a radius of a circle client/server. All you have to do is add and change a few lines to incorporated the BMI.
Here is the example:
Client.java
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 {
// IO streams
DataOutputStream toServer = null;
DataInputStream fromServer = null;
@Override // Override the start method in the Application class
public void start(Stage primaryStage) {
// Panel p 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");
paneForTextField.setLeft(new Label("Enter a radius: "));
TextField tf = new TextField();
tf.setAlignment(Pos.BOTTOM_RIGHT);
paneForTextField.setCenter(tf);
BorderPane mainPane = new BorderPane();
// Text area to display contents
TextArea ta = new TextArea();
mainPane.setCenter(new ScrollPane(ta));
mainPane.setTop(paneForTextField);
// Create a scene and place it in the stage
Scene scene = new Scene(mainPane, 450, 200);
primaryStage.setTitle("Client"); // Set the stage title
primaryStage.setScene(scene); // Place the scene in the stage
primaryStage.show(); // Display the stage
tf.setOnAction(e -> {
try {
// Get the radius from the text field
double radius = Double.parseDouble(tf.getText().trim());
// Send the radius to the server
toServer.writeDouble(radius);
toServer.flush();
// Get area from the server
double area = fromServer.readDouble();
// Display to the text area
ta.appendText("Radius is " + radius + " ");
ta.appendText("Area received from the server is "
+ area + ' ');
} catch (IOException ex) {
System.err.println(ex);
}
});
try {
// Create a socket to connect to the server
Socket socket = new Socket("localhost", 8000);
// Socket socket = new Socket("130.254.204.36", 8000);
// Socket socket = new Socket("drake.Armstrong.edu", 8000);
// 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() + ' ');
}
}
/**
* 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);
}
}
Server.java
import java.io.*;
import java.net.*;
import java.util.Date;
import javafx.application.Application;
import javafx.application.Platform;
import javafx.scene.Scene;
import javafx.scene.control.ScrollPane;
import javafx.scene.control.TextArea;
import javafx.stage.Stage;
public class Server extends Application {
@Override // Override the start method in the Application class
public void start(Stage primaryStage) {
// Text area for displaying contents
TextArea ta = new TextArea();
// Create a scene and place it in the stage
Scene scene = new Scene(new ScrollPane(ta), 450, 200);
primaryStage.setTitle("Server"); // Set the stage title
primaryStage.setScene(scene); // Place the scene in the stage
primaryStage.show(); // Display the stage
new Thread(() -> {
try {
// Create a server socket
ServerSocket serverSocket = new ServerSocket(8000);
Platform.runLater(()
-> ta.appendText("Server started at " + new Date() + ' '));
// Listen for a connection request
Socket socket = serverSocket.accept();
// Create data input and output streams
DataInputStream inputFromClient = new DataInputStream(
socket.getInputStream());
DataOutputStream outputToClient = new DataOutputStream(
socket.getOutputStream());
while (true) {
// Receive radius from the client
double radius = inputFromClient.readDouble();
// Compute area
double area = radius * radius * Math.PI;
// Send area back to the client
outputToClient.writeDouble(area);
Platform.runLater(() -> {
ta.appendText("Radius received from client: "
+ radius + ' ');
ta.appendText("Area is: " + area + ' ');
});
}
} catch (IOException ex) {
ex.printStackTrace();
}
}).start();
}
/**
* 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);
}
}
you can plug this BMI code into the server so send to the client. Just replace the radius code.
public class BMI {
private String name;
private int age;
private double weight; // in pounds
private double height; // in inches
public static final double KILOGRAMS_PER_POUND = 0.45359237;
public static final double METERS_PER_INCH = 0.0254;
public BMI(String name, int age, double weight, double height) {
this.name = name;
this.age = age;
this.weight = weight;
this.height = height;
}
public BMI(String name, double weight, double height) {
this(name, 20, weight, height);
}
public double getBMI() {
double bmi = weight * KILOGRAMS_PER_POUND /
((height * METERS_PER_INCH) * (height * METERS_PER_INCH));
return Math.round(bmi * 100) / 100.0;
}
public String getStatus() {
double bmi = getBMI();
if (bmi < 18.5)
return "Underweight";
else if (bmi < 25)
return "Normal";
else if (bmi < 30)
return "Overweight";
else
return "Obese";
}
public String getName() {
return name;
}
public int getAge() {
return age;
}
public double getWeight() {
return weight;
}
public double getHeight() {
return height;
}
}
Explanation / Answer
//Server.java
import java.io.*;
import java.net.*;
import java.util.Arrays;
import java.util.Date;
import javafx.application.Application;
import javafx.application.Platform;
import javafx.scene.Scene;
import javafx.scene.control.ScrollPane;
import javafx.scene.control.TextArea;
import javafx.stage.Stage;
public class Server extends Application {
public static final double KILOGRAMS_PER_POUND = 0.45359237;
public static final double METERS_PER_INCH = 0.0254;
@Override // Override the start method in the Application class
public void start(Stage primaryStage) {
// Text area for displaying contents
TextArea ta = new TextArea();
// Create a scene and place it in the stage
Scene scene = new Scene(new ScrollPane(ta), 450, 200);
primaryStage.setTitle("Server"); // Set the stage title
primaryStage.setScene(scene); // Place the scene in the stage
primaryStage.show(); // Display the stage
new Thread(() -> {
try {
// Create a server socket
ServerSocket serverSocket = new ServerSocket(8000);
Platform.runLater(()
-> ta.appendText("Server started at " + new Date() + ' '));
// Listen for a connection request
Socket socket = serverSocket.accept();
// Create data input and output streams
DataInputStream inputFromClient = new DataInputStream(
socket.getInputStream());
DataOutputStream outputToClient = new DataOutputStream(
socket.getOutputStream());
while (true) {
// Receive weight and height from the client
byte[] b = new byte[1024];
inputFromClient.read(b);
//convert byte array to string
String data=Arrays.toString(b);
// split the string into two words
String d[]=data.split(" ");
// convert words to double
double weight=Double.parseDouble(d[0]);
double height=Double.parseDouble(d[1]);
// Compute BMI
double bmi = weight * KILOGRAMS_PER_POUND /((height * METERS_PER_INCH) * (height * METERS_PER_INCH));
bmi=Math.round(bmi * 100) / 100.0;
// Send bmi back to the client
outputToClient.writeDouble(bmi);
Platform.runLater(() -> {
ta.appendText("Weight and Height received from client: "
+ weight +" "+height+" "+ ' ');
ta.appendText("BMI is: " + bmi + ' ');
});
}
} catch (IOException ex) {
ex.printStackTrace();
}
}).start();
}
/**
* 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);
}
}
/*********************************************************************/
//Client.java
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 {
// IO streams
DataOutputStream toServer = null;
DataInputStream fromServer = null;
@Override // Override the start method in the Application class
public void start(Stage primaryStage) {
// Panel p 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");
paneForTextField.setLeft(new Label("Enter a Weight: "));
TextField tf = new TextField();
tf.setAlignment(Pos.BOTTOM_RIGHT);
paneForTextField.setCenter(tf);
paneForTextField.setPadding(new Insets(5, 5, 5, 5));
paneForTextField.setStyle("-fx-border-color: green");
paneForTextField.setLeft(new Label("Enter a Height: "));
TextField tf1 = new TextField();
tf1.setAlignment(Pos.BOTTOM_RIGHT);
paneForTextField.setCenter(tf1);
BorderPane mainPane = new BorderPane();
// Text area to display contents
TextArea ta = new TextArea();
mainPane.setCenter(new ScrollPane(ta));
mainPane.setTop(paneForTextField);
// Create a scene and place it in the stage
Scene scene = new Scene(mainPane, 450, 200);
primaryStage.setTitle("Client"); // Set the stage title
primaryStage.setScene(scene); // Place the scene in the stage
primaryStage.show(); // Display the stage
tf.setOnAction(e -> {
try {
// Get the weight and height from the text fields
double weight = Double.parseDouble(tf.getText().trim());
double height = Double.parseDouble(tf1.getText().trim());
// convert to string
String info=weight+" "+height;
// covert to byte array
byte b[]=info.getBytes();
// Send the weight and height to the server
toServer.write(b);
toServer.flush();
// Get area from the server
double BMI = fromServer.readDouble();
String status="";
if (BMI < 18.5)
status= "Underweight";
else if (BMI < 25)
status= "Normal";
else if (BMI < 30)
status= "Overweight";
else
status= "Obese";
// Display to the text area
ta.appendText("Your BMI value: " + BMI + " ");
ta.appendText("Your Status: "+ status + ' ');
} catch (IOException ex) {
System.err.println(ex);
}
});
try {
// Create a socket to connect to the server
Socket socket = new Socket("localhost", 8000);
// Socket socket = new Socket("130.254.204.36", 8000);
// Socket socket = new Socket("drake.Armstrong.edu", 8000);
// 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() + ' ');
}
}
/**
* 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);
}
}
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