24 Which of the following statements is true? 25 The ActionListener interface co
ID: 3915323 • Letter: 2
Question
24
Which of the following statements is true?
25
The ActionListener interface contains the ____ method specification.
26
Which class do you use to write data to a text file?
27
To create a window, which of the following classes has to be extended?
28
Which of the following correctly declares and initializes a String object?
29
To convert a String to an integer, you use the valueOf() method of the ____ class.
30
To specify an italic font, you pass ____ to the constructor.
31
If a method throws an exception that it will not catch but that will be caught by a different method, you must also use the keyword ____ followed by an Exception type in the method header.
32
An abstract class can contain ____.
33
When you instantiate an object from a class, ____ is reserved for each instance field in the class.
34
___________ can be used to enter or display a string.
The class Exception, which is derived from the class Object, is the superclass of the class Throwable.Explanation / Answer
24.
Option B: The class Throwable, which is derived from the class Object, is the superclass of the class Exception.
Explanation: Throwable class is derived from Object class
25.
Option B: actionPerformed(ActionEvent e)
Explanation: ActionListener has only one method, it has no corresponding adapter class. This method is called just after the user performs an action.
26.
Option A: File
Explanation: File is class used to work on files(I/O)
Formatter is used to format the variable
Scanner is used to get the input from keyboard.
27.
Option B: JFrame
Explanation: To create a window, JFrame has to be extended.
28.
Option C: String greeting = "Hello";
Explanation: String greeting = "Hello"; initializs the string greeting and declares it to Hello
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