Java Questions & Answers – Random Number

This set of Java Multiple Choice Questions & Answers (MCQs) focuses on “Random Number”.

1. Which class is used to generate random number?
a) java.lang.Object
b) java.util.randomNumber
c) java.util.Random
d) java.util.Object
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2. Which method is used to generate boolean random values in java?
a) nextBoolean()
b) randomBoolean()
c) previousBoolean()
d) generateBoolean()
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3. What is the return type of Math.random() method?
a) Integer
b) Double
c) String
d) Boolean
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4. Random is a final class?
a) True
b) False
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5. What is the range of numbers returned by Math.random() method?
a) -1.0 to 1.0
b) -1 to 1
c) 0 to 100
d) 0.0 to 1.0
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6. How many bits are used for generating random numbers?
a) 32
b) 64
c) 48
d) 8
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7. What will be the output of the following Java code snippet?

int a = random.nextInt(15) + 1;

a) Random number between 1 to 15, including 1 and 15
b) Random number between 1 to 15, excluding 15
c) Random number between 1 to 15, excluding 1
d) Random number between 1 to 15, excluding 1 and 15
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8. What will be the output of the following Java code snippet?

int a = random.nextInt(7) + 4;

a) Random number between 4 to 7, including 4 and 7
b) Random number between 4 to 7, excluding 4 and 7
c) Random number between 4 to 10, excluding 4 and 10
d) Random number between 4 to 10, including 4 and 10
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9. Math.random() guarantees uniqueness?
a) True
b) False
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10. What is the signature of Math.random() method?
a) public static double random()
b) public void double random()
c) public static int random()
d) public void int random()
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Sanfoundry Global Education & Learning Series – Java Programming Language.

To practice all areas of Java language, here is complete set of 1000+ Multiple Choice Questions and Answers.