Author Question: Analyze the following code.import javafx.application.Application;import javafx.scene.Scene;import ... (Read 128 times)

oliviahorn72 · **on:** May 6, 2020

Analyze the following code.

import javafx.application.Application;
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) {

// Create a button and place it in the scene

Button btOK = new Button("OK");

btOK.setOnAction(e -> System.out.println("OK 1"));

btOK.setOnAction(e -> System.out.println("OK 2"));

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);

}
}

◦ When clicking the button, the program displays OK2.
◦ The program has a compile error, because the setOnAction method is invoked twice.
◦ When clicking the button, the program displays OK1 OK2.
◦ When clicking the button, the program displays OK1.

scikid · **Reply #1 on:** May 6, 2020

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