Which of the following statements are true? ComboBox inherits from ComboBoxBase.

Question

Which of the following statements are true?

ComboBox inherits from ComboBoxBase.

ComboBox inherits from ButtonBase.

ComboBox inherits from Labelled.

ComboBox inherits from Control.

ComboBox inherits from Node

A subclass cannot extend more than one class, but may implement any number of interfaces.

true

false

Analyze the following code:

import javafx.application.Application;
import javafx.scene.Scene;
import javafx.scene.control.Button;
import javafx.scene.layout.Pane;
import javafx.scene.layout.FlowPane;
import javafx.stage.Stage;

One button is displayed with the text "Java".

Two buttons are displayed with the same text "Java".

Three buttons are displayed with the same text "Java".

Four buttons are displayed with the same text "Java"

To add two nodes node1 and node2 into a pane, use ________.

pane.add(node1, node2);

pane.addAll(node1, node2);

pane.getChildren().add(node1, node2);

pane.getChildren().addAll(node1, node2);

Assume p is a Polygon, to add a point (4, 5) into p, use ________.

p.getPoints().add(4); p.getPoints().add(5);

p.getPoints().add(4.0); p.getPoints().add(5.0);

p.getPoints().addAll(4, 5);

p.getPoints().addAll(4.0, 5.0);

ComboBox inherits from ComboBoxBase.

ComboBox inherits from ButtonBase.

ComboBox inherits from Labelled.

ComboBox inherits from Control.

ComboBox inherits from Node

Explanation / Answer

1) ComboBox inherits from ComboBoxBase

2) True

3) Four buttons are displayed with the same text "Java"

4) pane.getChildren().addAll(node1, node2);

5) p.getPoints().add(4.0); p.getPoints().add(5.0);

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