Multiple Choice for Java Please answer the questions correctly. 1: JButtons gene
ID: 3565694 • Letter: M
Question
Multiple Choice for Java
Please answer the questions correctly.
1: JButtons generate what type of event?
2: A JFrame supports three operations when the user closes the window. Which of the choices below is not one of the three:
3: Which of the following is not one of the seven methods for handling window events?
4: Which of the following is false?
.5: What happens if setSize is not called on a JFrane (assume pack is not called)?
6: Which of the following does not generate GUI events?
a. Typing in a text field.
b. Selecting an item from a menu.
c. Displaying the text in a label.
d. Moving the mouse.
7: Which of the following most completely describes the steps for setting up event handling for a GUI component?
a. Create a class that represents the event handler, attach the JFrame to a JWindow object and register the event handler.
b. Implement an appropriate event-listener interface and register the event handler.
c. Create a class that represents the event handler and implement an appropriate event-listener interface.
d. Create a class that represents the event handler, implement an appropriate event-listener interface and register the event handler.
8: When the user presses Enter in a JTextField, the GUI component generates an , which is processed by an object that implements the interface .
a. ActionEvent, ActionListener.
b. ActionEvent, ActionEventListener.
c. TextEvent, TextListener.
d. TextEvent, TextEventListener.
9: Forgetting to register an event-handler object for a particular GUI component
Explanation / Answer
1)
1.ActionEvents
2)
3. LOWER_ON_CLOSE
3)
3. windowOpening
4)
1. JFrame is a lightweight component
5)
1. The window is displayed at its preferred size
6)
c. Displaying the text in a label
7)
d. Create a class that represents the event handler, implement an appropriate event-listener interface and register the event handler.
8)
c. TextEvent, TextListener.
9)
a. events of that type to be ignored.
10)
c. getText
11)
c. one or more
12)
d. ButtonGroup
13)
b. causes all the JRadioButtons in the group to have their event handlers registered.
14)
c. They are declared with the anonymous keyword.
15)
a. JTextField
16)
c. mouseDragged
17)
d. MouseListener only
18)
c. When it is not desirable to declare every method in the event-listener interface.
19)
c. keyClicked
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