Web Services Development MCQs with Answers
Practice important Web Services Development MCQs with answers and explanations.
Chapter: 5
Q121:
What does a wrapper class in Java encapsulate?
A. A single, mutable value
B. A single, immutable value
C. Multiple mutable values
D. Multiple immutable values
Correct Answer:
B
Chapter: 5
Q122:
What class wraps an int value in Java?
A. Integer
B. IntWrapper
C. IntClass
D. Float
Correct Answer:
A
Chapter: 5
Q123:
What is the term for the automatic conversion between primitive types and their corresponding wrapper classes?
A. Boxing
B. Unboxing
C. Autoboxing
D. Casting
Correct Answer:
C
Chapter: 5
Q124:
Converting an Integer object to an int value is known as what?
A. Autoboxing
B. Boxing
C. Wrapping
D. Unboxing
Correct Answer:
D
Chapter: 5
Q125:
Which of the following operators assigns the result of addition in Java?
A. =
B. +=
C. ++
D. +
Correct Answer:
B
Chapter: 5
Q126:
Which operator is used for signed right bit shift in Java?
A. <<=
B. >>=
C. >>>=
D. ^=
Correct Answer:
B
Chapter: 5
Q127:
Which operator is used for incrementing a value by 1 in Java?
A. ++
B. +=
C. --
D. -=
Correct Answer:
A
Chapter: 5
Q128:
Where can an increment operator be placed relative to a variable in Java?
A. Before only
B. After only
C. Before or after
D. Neither
Correct Answer:
C
Chapter: 5
Q129:
What happens if the condition in a for loop is omitted?
A. The loop runs once
B. The loop never runs
C. An error occurs
D. An infinite loop is created
Correct Answer:
D
Chapter: 5
Q130:
In Java, what type of loop is generally used when the number of iterations is known beforehand?
A. While loop
B. For loop
C. Do-while loop
D. Infinite loop
Correct Answer:
B
Chapter: 5
Q131:
What error occurs if a counter-controlled repetition condition is off by one?
A. Syntax error
B. Infinite loop
C. Off-by-one error
D. Null pointer exception
Correct Answer:
C
Chapter: 5
Q132:
What type of loop is used when one loop is placed inside another loop?
A. Nested loop
B. Infinite loop
C. While loop
D. Do-while loop
Correct Answer:
A
Chapter: 5
Q133:
In Java, autoboxing converts a ________ type to its corresponding object type.
A. primitive
B. object
C. reference
D. string
Correct Answer:
A
Chapter: 5
Q134:
The result of a signed right bit shift operation is assigned using which operator?
A. <<=
B. >>=
C. >>>=
D. &=
Correct Answer:
B
Chapter: 5
Q135:
The Java assignment operator "+=" is equivalent to which operation?
A. x = x + 1
B. x = x + y
C. x = y + 1
D. x + 2 = x
Correct Answer:
B
Chapter: 5
Q136:
In a nested loop, where is the inner loop placed relative to the outer loop?
A. Before the outer loop
B. After the outer loop
C. Inside the outer loop
D. Outside the outer loop
Correct Answer:
C
Chapter: 5
Q137:
A wrapper class in Java is used to encapsulate ________.
A. A mutable value
B. An immutable value
C. Multiple values
D. A reference
Correct Answer:
B
Chapter: 5
Q138:
Autoboxing is the automatic conversion from a ________ to its corresponding wrapper class.
A. object type
B. string
C. primitive type
D. boolean
Correct Answer:
C
Chapter: 5
Q139:
What is the result of the following code? "int a = 5; int b = a--; int c = a * b;"
A. a=5, b=5, c=25
B. a=4, b=5, c=20
C. a=4, b=4, c=16
D. a=5, b=4, c=20
Correct Answer:
B
Chapter: 5
Q140:
The operator ">>=" is used for ________ in Java.
A. Signed left shift
B. Signed right shift
C. Unsigned right shift
D. Bitwise AND
Correct Answer:
B