Could you review and advise me on how to correct code to create an 1. btOne as a

Question

Could you review and advise me on how to correct code to create an

1. btOne as a Inner Class Listener,

2. btTwo as a Anonymous Listener

3. btThree as a Lambda expression.

Thank you

package Threebuttons;

import javafx.application.Application;

import javafx.event.ActionEvent;

import javafx.event.EventHandler;

import javafx.geometry.Pos;

import javafx.scene.Scene;

import javafx.scene.control.Button;

import javafx.scene.layout.BorderPane;

import javafx.scene.layout.HBox;

import javafx.scene.layout.Pane;

import javafx.scene.text.Text;

import javafx.stage.Stage;

public class Threebuttons extends Application {

  @Override //*Override the start method in the Application class

public void start(Stage primaryStage) {

     

    // Hold three buttons in an HBox

    HBox hBox = new HBox();

    hBox.setSpacing(10);

    hBox.setAlignment(Pos.CENTER);   

    Button btOne = new Button("Button 1");

    Button btTwo = new Button("Button 2");

    Button btThree = new Button("Button 3");

    hBox.getChildren().addAll(btOne, btTwo, btThree);

    //*Create and Register the handler

    btOne.setOnAction(new OneHandler());

   

    BorderPane borderPane = new BorderPane();

    borderPane.setCenter(hBox);

    BorderPane.setAlignment(hBox, Pos. CENTER);

   

    //*Create a scene and place it in the stage

    Scene scene = new Scene(hBox, 300, 500);

    primaryStage.setTitle("Three Buttons"); //*Set title

    primaryStage.setScene(scene); //*Place the scene in the stage

    primaryStage.show(); //*Display the stage

}

      //*Button One - Inner Class Listener

    class OneListener implements EventHandler {

        @Override

        public void handle(ActionEvent e) {

            System.out.println("Hello World");

        }

    //*Button Two - Anonymous Listener

    btTwo.setOnAction(new EventHandler() {

        @Override

        public void handle(ActionEvent e) {

        System.out.println("Hello World");

    }

    });

    //*Button Three - Lambda Expression p598 lines23-25

    btThree.setOnAction((ActionEvent e) -> {

        System.out.println("Hello World");

    });

    }

    //*keep main method launch application

    public static void main(String[] args) {

        Application.launch(args);

}

}

Explanation / Answer

Explanation: Below is the Java code for above problem with proper description provided within comments itself. If you need any other help for this Comment me below. Thanks Java code : import javafx.application.Application; import javafx.event.ActionEvent; import javafx.event.EventHandler; import javafx.geometry.Pos; import javafx.scene.Scene; import javafx.scene.control.Button; import javafx.scene.layout.HBox; import javafx.stage.Stage; public class Threebuttons extends Application { public static void main(String[] args) { launch(args); } HBox hBox; @Override // *Override the start method in the Application class public void start(Stage primaryStage) { // Hold three buttons in an HBox hBox = new HBox(); hBox.setSpacing(10); hBox.setAlignment(Pos.CENTER); Button btOne = new Button("Button 1"); Button btTwo = new Button("Button 2"); Button btThree = new Button("Button 3"); hBox.getChildren().addAll(btOne, btTwo, btThree); // Create and Register the handler // Inner class Listener btOne.setOnAction(new EventHandler() { @Override public void handle(ActionEvent event) { System.out.println("Hello World! Btn 1"); } }); // - Anonymous Class Listener btTwo.setOnAction(new OneListener()); // Lambda expression btThree.setOnAction((event) -> { System.out.println("Hello World! Btn 3"); }); // Create a scene and place it in the stage Scene scene = new Scene(hBox, 300, 500); primaryStage.setTitle("Three Buttons"); // *Set title primaryStage.setScene(scene); // *Place the scene in the stage primaryStage.show(); // *Display the stage } // Button two - Anonymous Class Listener class OneListener implements EventHandler { @Override public void handle(ActionEvent e) { System.out.println("Hello World! Btn 2"); } } }

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