In java language Question 16 Which of the following statements makes the text in

Question

In java language

Question 16

Which of the following statements makes the text in a JTextField uneditable?

Select one:

a. textField.setEditable(false);

b. textField.setUneditable(false);

c. textField.setEditable(true);

d. textField.setUneditable(true);

Question 17

When the user clicks a JCheckBox, a/an _____ occurs.

Select one:

a. ButtonEvent

b. ItemEvent

c. ActionEvent

d. CheckedEvent

Question 18

Which method determines if a JCheckBox is selected?

Select one:

a. None of the above

b. selected

c. isSelected

d. getSelected

Question 19

The logical relationship between radio buttons is maintained by objects of what class?

Select one:

a. MutualExclusionGroup

b. Group

c. RadioButtonGroup

d. ButtonGroup

Question 20

Method paintComponent is called when:

Select one:

a. a lightweight Swing component is displayed.

b.an application exits.

c. a lightweight Swing component is created.

d. a lightweight Swing component is clicked.

Question 21

Method _____ indicates that a Component should be refreshed on screen as soon as possible with a call to that control’s paintComponent method.

Select one:

a. refresh

b. redraw

c. repaint

d. repaintComponent

Question 22

In the Java coordinate system, the point (0, 0) is ________.

Select one:

a. The lower-right corner of the screen.

b. The upper-left corner of the screen.

c. The lower-left corner of the screen.

d. The upper-right corner of the screen.

Question 23

Which of the following statements about the Graphics object is true? Select all that apply.

Select one or more:

a. The Graphics class is abstract.

b. The Graphics object manages a graphics context.

c. The Graphics object is instantiated by the user.

d. The Graphics object is the argument to a lightweight GUI component's paintComponent method.

e. The Graphics object is an argument to class Component’s repaint method.

Question 24

The Java statement:

g.fillOval(290, 100, 90, 55);

Select one:

a. Draws a filled oval bounded by a rectangle with its upper-left corner at coordinates x=290, y=100, with width=90 and height=55.

b. Draws a filled oval with its center at coordinates x=290, y=100, with width=90 and height=55.

c. Draws a filled oval bounded by a rectangle with its center at coordinates x=290, y=100, with height=90 and width=55.

d. Draws a filled oval with its leftmost point at coordinates x=290, y=100, with width=90 and height=55.

Explanation / Answer

Q16
a. textField.setEditable(false);

Q17
d. CheckedEvent

Q18
b. selected

Q19
d. ButtonGroup

Q20
a. a lightweight Swing component is displayed.

Q21
c. repaint

Q22
b. The upper-left corner of the screen.

Q23
b. The Graphics object manages a graphics context.

Q24
b. Draws a filled oval with its center at coordinates x=290, y=100, with width=90 and height=55.

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