AP ECET COMPUTER SCIENCE AND ENGINEERING Multiple Choice Questions (MCQs)
AP ECET Computer Science and Engineering - Java Programming
-
Which of the following is the correct syntax for defining a class in Java?
- a)
class MyClass() - b)
class MyClass {} - c)
MyClass class {} - d)
class = MyClass {}
Answer: b)
class MyClass {} - a)
-
Which of the following keywords is used to prevent a method from being overridden in Java?
- a)
final - b)
static - c)
abstract - d)
private
Answer: a)
final - a)
-
What is the default value of a local variable in Java?
- a)
null - b)
0 - c) Undefined
- d) It does not have a default value
Answer: d) It does not have a default value
- a)
-
Which of the following is true about constructors in Java?
- a) A constructor can be called explicitly.
- b) Constructors are not inherited.
- c) Constructors have a return type.
- d) Constructors can be called multiple times in an object’s lifetime.
Answer: b) Constructors are not inherited.
-
Which of the following is used to implement multiple inheritance in Java?
- a) Interface
- b) Abstract class
- c) Class
- d) Both a and b
Answer: a) Interface
-
Which of the following is used to handle exceptions in Java?
- a)
catch - b)
throw - c)
finally - d) All of the above
Answer: d) All of the above
- a)
-
In Java, which method is used to start a thread?
- a)
init() - b)
start() - c)
run() - d)
begin()
Answer: b)
start() - a)
-
What is the size of an
intvariable in Java?- a) 16-bit
- b) 32-bit
- c) 64-bit
- d) 8-bit
Answer: b) 32-bit
-
Which of the following is the superclass of all classes in Java?
- a)
Object - b)
Class - c)
System - d)
Thread
Answer: a)
Object - a)
-
Which of the following is the correct way to declare an array in Java?
- a)
int[] arr = new int[5]; - b)
int arr[5]; - c)
array int[] arr = new array[5]; - d)
array arr = new array[5];
Answer: a)
int[] arr = new int[5]; - a)
-
Which method is used to read a character from the keyboard in Java?
- a)
readLine() - b)
read() - c)
getchar() - d)
nextChar()
Answer: b)
read() - a)
-
In Java, which of the following is the correct way to create a new thread?
- a)
Thread t = new Thread(); - b)
Thread t = new Thread(Runnable); - c)
Thread t = new Runnable(); - d) Both a and b
Answer: d) Both a and b
- a)
-
What will be the output of the following Java code snippet?
int x = 10; int y = 20; System.out.println(x + y);- a) 1020
- b) 30
- c) 10 20
- d) Error
Answer: b) 30
-
What is the correct way to handle a file operation exception in Java?
- a)
try-catchblock - b)
throwsdeclaration - c)
try-throwblock - d) Both a and b
Answer: d) Both a and b
- a)
-
Which of the following is NOT a feature of Java's AWT (Abstract Window Toolkit)?
- a) It provides a set of graphical user interface components.
- b) It is platform-independent.
- c) It handles mouse events.
- d) It is used for creating graphical applications.
Answer: b) It is platform-independent.
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