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Study and learn Java MCQ questions and answers on Logical Operators and their priorities. Attend job interviews easily with these Multiple Choice Questions. You can download these questions in PDF format. Just choose Print and select PDF as the format in Chrome or any other browser.
Go through Java Theory Notes on Logical Operators before reading questions.
1) What happens to the
Second operand/expression if the first operand is FALSE with a Short Circuit
AND (&&) operator?
A) Second
operand/expression is evaluated and AND is applied.
B) Evaluation of Second
operand/expression is skipped.
C) The compiler starts
taking more memory
D) The compiler starts
taking more CPU power.
Answer [=]
B
Explanation:
Whether it is normal AND
operator or Short Circuit AND operator, both operands should be TRUE to give
output as true. If the first operand itself is false, there is no point in
evaluating the second expression.
2) What happens to the
Second Operand/expression if the first operand is TRUE with a Short Circuit OR
(||) operator in Java?
A) Second
expression/operand is evaluated and OR is applied to both operands
B) Evaluating the Second
expression/operand is skipped
C) The compiler starts
taking more memory
D) The compiler starts
taking more CPU power
Answer [=]
B
Explanation:
Both OR (|) and Short
Circuit OR (||) operators give an output of true if at least one operand is
true. Already the first operand is true. There is no need to evaluate or
execute the second expression/operand.
3) What is the output of
an Exclusive OR (^) operation if one of the operands/expressions is TRUE?
A) false
B) true
C) true or false
D) None of the above
Answer [=]
C
Explanation:
Exclusive OR (^) gives an
output of true if both the operands are different. If both are the same (true /
false), the output is false. So, with just one operand, you can not decide the
output.
4) What is the output of
an Exclusive OR(^) operation, if one of the operands is false?
A) false
B) true
C) true or false
D) None of the above
Answer [=]
C
Explanation:
Exclusive OR (^) gives an
output of true if both the operands are different. If both are the same (true /
false), the output is false. So, with just one operand, you can not decide the
output.
5) Which is the Logical
operator in Java that has the highest priority among all other logical
operators?
A) Short Circuit AND
(&&)
B) AND (&)
C) NOT (!)
D) Exclusive OR (^)
Answer [=]
C
6) Among the Logical
operators, AND (&) and Short Circuit AND (&&), which has higher
priority?
A) AND (&)
B) Short Circuit AND
(&&)
C) Both have same priority
D) None of the above
Answer [=]
A
7) Among the logical
operators, OR (|) and Short Circuit OR (||), which operator has higher
priority?
A) OR (|)
B) Short Circuit OR (||)
C) Both have the same
priority
D) None of the above
Answer [=]
A
8) Among the logical
operators, OR (|), Short Circuit OR (||) and Exclusive OR (^), which
operator has higher priority?
A) OR (|)
B) Short Circuit OR (||)
C) Exclusive OR (^)
D) All operators have the
same priority.
Answer [=]
C
Explanation:
! >
& >
^ >
| >
&& >
|| >
Assignment
9) Choose the correct
version of Logical Compound Assignment operators in Java below?
A) &=, |=, ^=
B) &&=, ||=, !=
C) A and B
D) None of the above
Answer [=]
A
Explanation:
There no logical compound
assignment operators like &&=, ||=, !=.
10) What is the output of
the Java code snippet below?
byte a= 1;
if(!a)
{
System.out.println("FISH");
}
else
{
System.out.println("CRAB");
}
A) CRAB
B) FISH
C) Compiler error
D) None of the above
Answer [=]
C
Explanation:
You can not convert
from byte to boolean.
The operator ! is
undefined for the argument type(s) byte
11) What is the output of
the Java code snippet?
int a=25, b=30;
boolean c = a>25 &
b<40;
if(c)
{
System.out.println("RABBIT");
}
else
{
System.out.println("GOOSE");
}
A) RABBIT
B) GOOSE
C) Compiler error
D) None of the above
Answer [=]
B
Explanation:
false & true
is false only.
12) What is the output of
the Java code snippet?
int a=25, b=30;
boolean c = a>25 |
b<40;
if(c)
{
System.out.println("RABBIT");
}
else
{
System.out.println("GOOSE");
}
A) RABBIT
B) GOOSE
C) Compiler error
D) None of the above
Answer [=]
A
Explanation:
false | true is true only.
13) What is the output of
the Java code snippet?
int a=3, b=8;
boolean c = a>5
&& ++b>6;
System.out.println(b);
A) 8
B) 9
C) 6
D) Compiler error
Answer [=]
A
Explanation:
++b>6 is not evaluated
as the first operand itself is false. Short Circuit AND operator skips the
second expression.
14) What is the output of
the Java code snippet?
int a=5, b=9;
boolean c = a>1 ||
b++<10;
System.out.println(b);
A) 9
B) 10
C) 8
D) Compiler error
Answer [=]
A
Explanation:
b++<10 is not evaluated
by the Short Circuit OR operator as the first operand is already true. There is
no need to check the second expression.
15) What is the output of
the Java code snippet?
int a=4, b=6, c=8;
boolean d = a>5
&& b>5 & c++<10;
System.out.println(c);
A) 8
B) 9
C) 10
D) Compiler error
Answer [=]
B
Explanation:
Grouping or association of
operands is done first based on the priority.
a>5 && (b>5
& c++<10)
false &&
(anything)
false
16) What is the output of
the Java code snippet?
int a=4, b=8;
boolean c = a>1 ^
b<10;
if(c)
{
System.out.println("TREE");
}
else
{
System.out.println("BIRD");
}
A) TREE
B) BIRD
C) Compiler error
D) None of the above
Answer [=]
B
Explanation:
The exclusive operator (^)
gives an output of TRUE only if both the operands are different.
17) What is the output of
the Java code snippet?
int a=5;
boolean b = a>1 ||
false;
b ^= false;
System.out.println(b);
A) false
B) true
C) Compiler error
D) None of the above
Answer [=]
B
Explanation:
b ^= false;
b = b^false;
b = true ^ false;
b = true;
18) What is the output of
the Java code snippet?
int a=4, b=8;
boolean c = a>2 ^
b<10 & false;
System.out.println(c);
A) false
B) true
C) Compiler error
D) None of the above
Answer [=]
B
Explanation:
AND has a higher priority
than Exclusive OR.
a>2 ^ b<10 &
false
a>2 ^ (b<10 &
false)
a>2 ^ (true & false)
a>2 ^ (false)
true ^ false
true
19) What is the output of
the Java code snippet?
int a=3, b=1;
int c = a & b;
System.out.println("CAT
" + c);
A) CAT true
B) CAT 1
C) Compiler error
D) None of the above
Answer [=]
B
Explanation:
Here AND & operator is
used with numbers. So, it is a Bitwise operator, not a Logical operator.
20) If an AND (&)
operator is applied with two integers, what is this operator?
A) Boolean operator
B) Bitwise operator
C) Logical operator
D) Arithmetic operator
Answer [=]
B
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