Question

Heads or Tails

Create a JavaFX application that simulates a coin being tossed. When the user clicks a button, the application should generate a random number in the range of 0 to 1. If the number is 0, the coin has landed on “heads,” and if the number is 1, the coin has landed on “tails.” Use an ImageView component, and the coin images that you will find in this book’s Student Sample Programs to display the side of the coin when it is tossed.

Answer 1

CoinTossingFXML.fxml

<?xml version="1.0" encoding="UTF-8"?>

<?import javafx.scene.control.Button?>
<?import javafx.scene.control.Label?>
<?import javafx.scene.image.ImageView?>
<?import javafx.scene.layout.AnchorPane?>
<?import javafx.scene.text.Font?>

<AnchorPane id="AnchorPane" prefHeight="298.0" prefWidth="370.0" xmlns:fx="http://javafx.com/fxml/1" xmlns="http://javafx.com/javafx/8.0.171" fx:controller="cointossing.FXMLDocumentController">
<children>
<Label layoutX="127.0" layoutY="14.0" text="Tossing the Coin">
<font>
<Font name="System Bold" size="15.0" />
</font>
</Label>
<ImageView fx:id="coinView" fitHeight="150.0" fitWidth="150.0" layoutX="110.0" layoutY="54.0" pickOnBounds="true" preserveRatio="true" />
<Button fx:id="tossButton" layoutX="158.0" layoutY="252.0" mnemonicParsing="false" prefHeight="25.0" prefWidth="54.0" text="Toss" />
</children>
</AnchorPane>

FXMLDocumentController.java

import java.io.File;
import java.net.URL;
import java.util.Random;
import java.util.ResourceBundle;
import javafx.event.ActionEvent;
import javafx.fxml.FXML;
import javafx.fxml.Initializable;
import javafx.scene.control.Button;
import javafx.scene.image.Image;
import javafx.scene.image.ImageView;

public class FXMLDocumentController implements Initializable {
  
@FXML private ImageView coinView;
@FXML private Button tossButton;
  
private int tossSide = -1;
  
@Override
public void initialize(URL url, ResourceBundle rb) {
  
tossButtonAction();
  
tossButton.setOnAction((ActionEvent event) -> {
tossButtonAction();
});
}
  
public void tossButtonAction()
{
tossSide = generateRandomNumber();
File file;
Image image;
  
// if tossSide is 0, coin has landed on HEADS
switch(tossSide)
{
case 0:
file = new File("src/coin_head.JPG");
image = new Image(file.toURI().toString());
coinView.setImage(image);
break;
  
case 1:
file = new File("src/coin_tail.JPG");
image = new Image(file.toURI().toString());
coinView.setImage(image);
break;
  
default:
tossSide = generateRandomNumber();
}
}
  
public int generateRandomNumber()
{
Random rand = new Random();
return(rand.nextInt(2));
}
}

CoinTossing.java (Main class)

import javafx.application.Application;
import javafx.fxml.FXMLLoader;
import javafx.scene.Parent;
import javafx.scene.Scene;
import javafx.stage.Stage;

public class CoinTossing extends Application {
  
@Override
public void start(Stage stage) throws Exception {
Parent root = FXMLLoader.load(getClass().getResource("CoinTossingFXML.fxml"));
  
Scene scene = new Scene(root);
  
stage.setScene(scene);
stage.setTitle("Tossing The Coin");
stage.show();
}

public static void main(String[] args) {
launch(args);
}
}

************************************************************** SCREENSHOT *************************************************************

Coin_head.jpg

Coin_tail.java

Application

Tossing The Coin 1回! Tossing the Coin Toss