JAVA认证

Question: 52

Which of the following event listeners have event adapters defined in Java?

A. MouseListener

B. KeyListener

C. ActionListener

D. ItemListener

E. WindowListener

Explanation:

Four listeners don't have their corresponding event adapters. They are ActionListener, ItemListener, AdjustmentListener and TextListener.

Correct Answer: A,B,E 52 of 60

Question: 53

Which one of the following methods is not related to the display of the applets?

A. update()

B. draw()

C. repaint()

D. paint()

Explanation:

The paint(), update() and repaint() are predefined methods in Java. They are related to the display of the applets.

Correct Answer: B 53 of 60

Question: 54

Given the following definition:

TextArea ta = new TextArea (Hello, 5, 5);

Which statements are true?

A. The maximum number of characters in a line is 5.

B. The displayed height is 5 lines otherwise constrain.

C. The displayed string can use multiple fonts.

D. The displayed strings are editable.

Explanation:

The TextArea is constructed to a 5 row * 5 character text area. It cannot display multiple fonts. The strings are editable by default. The displayed width of a line is 5 characters, but the maximum number in a line is more than 5.

Correct Answer: B,D 54 of 60

Question: 55

Which method can be used to add MenuBar to a Frame?

A. setMenu()

B. setMenuBar()

C. add()

D. addMenuBar()

Explanation:

MenuBar is added to a Frame by using the setMenuBar() method. The add() method is used to add components to containers.

Correct Answer: B 55 of 60

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