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

joesmith1212 · **on:** May 6, 2020

Question 1

Suppose A is an anonymous inner class in Test. A is compiled into a file named ________.
◦ Test$1.class
◦ A.class
◦ Test$A.class
◦ Test&1.class
◦ A$Test.class

Question 2

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.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");

btOK.setOnAction(new EventHandler() {

public void handle(ActionEvent e) {

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

}

});

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

primaryStage.setTitle("MyJavaFX"); // 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 handle method is not executed when you click the OK button, because no handler is registered with btOK.
◦ The message "The OK button is clicked" is displayed when you click the OK button.
◦ The program has a runtime error because no handlers are registered with btOK.
◦ The program has a compile error because no handlers are registered with btOK.

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

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