Author Question: Analyze the following code.import javafx.application.Application;import ... (Read 61 times)

rachel9 · **on:** May 6, 2020

Analyze the following code.

import javafx.application.Application;
import javafx.event.ActionEvent;
import javafx.event.EventHandler;
import javafx.scene.Scene;
import javafx.scene.control.Button;
import javafx.scene.layout.HBox;
import javafx.stage.Stage;

public class Test extends Application {
@Override // Override the start method in the Application class
public void start(Stage primaryStage) {

Button btOK = new Button("OK");

Button btCancel = new Button("Cancel");

EventHandler handler = new EventHandler() {

public void handle(ActionEvent e) {

System.out.println("The OK button is clicked");

}

};

btOK.setOnAction(handler);

btCancel.setOnAction(handler);

HBox pane = new HBox(5);

pane.getChildren().addAll(btOK, btCancel);

Scene scene = new Scene(pane, 200, 250);

primaryStage.setTitle("Test"); // Set the stage title

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

primaryStage.show(); // Display the stage

}

/**
* 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);

}
}

◦ The program has a runtime error, because the handler is registered with more than one source.
◦ When clicking the OK button, the program displays The OK button is clicked.
◦ When clicking either button, the program displays The OK button is clicked twice.
◦ When clicking the Cancel button, the program displays The OK button is clicked.

bbburns21 · **Reply #1 on:** May 6, 2020

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