Java.util.Random Class
Java Random Class
Java.util package provides a Random class. An instance of this class is used to generate a stream of pseudorandom numbers. The class uses a 48-bit seed, which is modified using a linear congruential formula. The algorithms implemented by class Random use a protected utility method that on each invocation can supply up to 32 pseudorandomly generated bits.
Class declaration
The declaration of java.util.Random class is:
public class Random
extends Object
implements Serializable
Class Constructors
| S.N | Constructors & Description |
|---|---|
| 1. |
Random() Creates a new random number generator. |
| 2. |
Random(long seed) Creates a new random number generator using a single long seed. |
java.util.Random Methods
The java.util.Random class has a number of methods which are listed below:
Member Methods
| S.N | Methods & Description |
|---|---|
| 1. |
DoubleStream doubles() Returns an effectively unlimited stream of pseudorandom double values, each between zero (inclusive) and one (exclusive). |
| 2. |
DoubleStream doubles(double randomNumberOrigin, double randomNumberBound) Returns an effectively unlimited stream of pseudorandom double values, each conforming to the given origin (inclusive) and bound (exclusive). |
| 3. |
DoubleStream doubles(long streamSize) Returns a stream producing the given streamSize number of pseudorandom double values, each between zero (inclusive) and one (exclusive). |
| 4. |
DoubleStream doubles(long streamSize, double randomNumberOrigin, double randomNumberBound) Returns a stream producing the given streamSize number of pseudorandom double values, each conforming to the given origin (inclusive) and bound (exclusive). |
| 5. |
IntStream ints() Returns an effectively unlimited stream of pseudorandom int values. |
| 6. |
IntStream ints(int randomNumberOrigin, int randomNumberBound) Returns an effectively unlimited stream of pseudorandom int values, each conforming to the given origin (inclusive) and bound (exclusive). |
| 7. |
IntStream ints(long streamSize) Returns a stream producing the given streamSize number of pseudorandom int values. |
| 8. |
IntStream ints(long streamSize, int randomNumberOrigin, int randomNumberBound) Returns a stream producing the given streamSize number of pseudorandom int values, each conforming to the given origin (inclusive) and bound (exclusive). |
| 9. |
LongStream longs() Returns an effectively unlimited stream of pseudorandom long values. |
| 10. |
LongStream longs(long randomNumberOrigin, long randomNumberBound) Returns an effectively unlimited stream of pseudorandom long values, each conforming to the given origin (inclusive) and bound (exclusive). |
| 11. |
LongStream longs(long streamSize) Returns a stream producing the given streamSize number of pseudorandom long values. |
| 12. |
LongStream longs(long streamSize, long randomNumberOrigin, long randomNumberBound) Returns a stream producing the given streamSize number of pseudorandom long, each conforming to the given origin (inclusive) and bound (exclusive). |
| 13. |
protected int next(int bits) Generates the next pseudorandom number. |
| 14. |
boolean nextBoolean() Returns the next pseudorandom, uniformly distributed boolean value from this random number generator's sequence. |
| 15. |
void nextBytes(byte[] bytes) Generates random bytes and places them into a user-supplied byte array. |
| 16. |
double nextDouble() Returns the next pseudorandom, uniformly distributed double value between 0.0 and 1.0 from this random number generator's sequence. |
| 17. |
float nextFloat() Returns the next pseudorandom, uniformly distributed float value between 0.0 and 1.0 from this random number generator's sequence. |
| 18. |
double nextGaussian() Returns the next pseudorandom, Gaussian ("normally") distributed double value with mean 0.0 and standard deviation 1.0 from this random number generator's sequence. |
| 19. |
int nextInt() Returns the next pseudorandom, uniformly distributed int value from this random number generator's sequence. |
| 20. |
int nextInt(int bound) Returns a pseudorandom, uniformly distributed int value between 0 (inclusive) and the specified value (exclusive), drawn from this random number generator's sequence. |
| 21. |
long nextLong() Returns the next pseudorandom, uniformly distributed long value from this random number generator's sequence. |
| 22. |
void setSeed(long seed) Sets the seed of this random number generator using a single long seed. |
Methods inherited
This class inherits the methods of following class:
- java.lang.Object
