Untitled Quiz

Java Adapter Classes

• Adapter classes provide empty implementations of methods in an interface.
• Used to simplify the process of event handling.
• The java.awt.event package is required for adapter classes.

Question 1

• Correct answer: A
• java.awt.event package is needed for adapter classes

Question 2

• Correct answer: D
• Adapter class provides an empty implementation of event listener interface

Question 3

• Correct answer: D
• Adapter classes include WindowAdapter, KeyAdapter, MouseAdapter

Question 4

• Correct answer: D
• The output of the code is "componentShown"

Question 5

• Correct answer: B
• KeyAdapter class implements the KeyListener interface.

Question 6

• Correct answer: f.addWindowListener(new WindowAdapter(){ public void windowClosing(WindowEvent e) { System.exit(0); } });

Question 7

• Correct answer: C
• FocusAdapter, FocusEvent

Question 8

• Correct answer: Inner

Question 9

• Correct answer: Listener

Question 10

• Correct answer: C
• ItemAdapter is not an adapter class.

Question 11

• Correct answer: B
• Adapter classes are used to simplify the process of event handling.

Question 12

• Correct answer: A
• An adapter class is an inner class

Question 13

• Correct answer: D
• WindowEvent is a subclass of Component Event.

Question 14

• Correct answer: C
• An adapter class provides an empty implementation of all methods in an interface.

Question 15

• Correct answer: B
• windowClosed() method does not belong to the WindowListener interface.

Question 16

• Correct answer: D
• windowIconified()

Question 17

• Correct answer: B
• ComponentAdapter

Question 18

• Correct answer: A
• Adapter classes use the methods of event classes.

Question 19

• Correct answer: A
• mouseDragged()

Question 20

• Correct answer: A
• Applet

Question 21

• Correct answer: C
• If an adapter class is inherited, there is no need to implement listener interfaces.

Question 22

• Correct answer: D
• Adapter classes can be used to incorporate inheritance, polymorphism, and encapsulation.

Question 23

• Correct answer: A
• In an adapter class, it is sufficient to only include the required methods.

Question 24

• Correct answer: B
• Adapter classes make programmers' tasks easier.

Question 25

• Correct answer: public

Question 26

• Correct answer: "componentShown"

Question 27

• Correct answer: Component Event

Question 28

• Correct answer: 1

Question 29

• Correct answer: B
• FocusAdapter

Question 30

• Correct answer: D
• Adapter classes and interfaces are not the same.

Question 31

• Correct answer: D
• Adapter classes save time, code, and space.

Question 32

• Correct answer: B

Question 33

• Correct answer: A

Question 34

• Correct answer: C
• A class that adapts methods of another class by giving different names to the same methods is called an adapter class.

Question 35

• Correct answer: A

Question 36

• Correct answer: D

Question 37

• Correct answer: B

Question 38

• Correct answer: C

Question 39

• Correct answer: A

Question 40

• Correct answer: A

Question 41

• Correct answer: D

Question 42

• Correct answer: D

Question 43

• Correct answer: B

Question 44

• Correct answer: D

Question 45

• Correct answer: C
• Code optimization

Question 46

• Correct answer: getEvent( )