JavaFX Random number generator
JavaFx User Interface Components: Exercise-3 with Solution
Write a JavaFX application with a label and a button. Initially, the label should be empty. When the button is clicked, set the label text to a random number between 1 and 10.
Sample Solution:
JavaFx Code:
import javafx.application.Application;
import javafx.scene.Scene;
import javafx.scene.control.Button;
import javafx.scene.control.Label;
import javafx.scene.layout.VBox;
import javafx.stage.Stage;
import java.util.Random;
public class Main extends Application {
public static void main(String[] args) {
launch(args);
}
@Override
public void start(Stage primaryStage) {
primaryStage.setTitle("Random Number App");
// Create an empty label.
Label label = new Label();
// Create a button labeled "Generate Random Number."
Button button = new Button("Generate Random Number");
// Set an action for the button to generate and display a random number.
button.setOnAction(event -> {
int randomNumber = generateRandomNumber(1, 10);
label.setText("Random Number: " + randomNumber);
});
// Create a layout (VBox) to arrange the label and button.
VBox root = new VBox(10);
root.getChildren().addAll(label, button);
// Create the scene and set it in the stage.
Scene scene = new Scene(root, 300, 200);
primaryStage.setScene(scene);
// Show the window.
primaryStage.show();
}
private int generateRandomNumber(int min, int max) {
Random random = new Random();
return random.nextInt(max - min + 1) + min;
}
}
In the exercise above, we create an empty label and a button labeled "Generate Random Number." When you click the button, an action is triggered to generate a random number between 1 and 10 using the "generateRandomNumber()" method. The generated random number is then displayed in the label. The label, button, and layout are organized using a 'VBox'.
Sample Output:
Flowchart:

Java Code Editor:
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