the random class

Question 1

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

Answer 1

c

Question 2

2. Which method is used to generate boolean random values in java?
   a) nextBoolean()
   b) randomBoolean()
   c) previousBoolean()
   d) generateBoolean()

Answer 2

a

Question 3

3. What is the return type of Math.random() method?
   a) Integer
   b) Double
   c) String
   d) Boolean

Answer 3

b

Question 4

Random is a final class?

a) True
b) False

Answer 4

b
Explanation: Random is not a final class and can be extended to implement the algorithm as per requirement.

Question 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

Answer 5

d

Question 6

How many bits are used for generating random numbers?

a) 32
b) 64
c) 48
d) 8

Answer 6

c

Question 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

Answer 7

a

Question 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

Answer 8

d