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) {
}
}
◦ 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.
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