All Packages  Class Hierarchy  This Package  Previous  Next  Index

Class java.util.Random

java.lang.Object
|
   +----java.util.Random

public class Random

extends Object

implements Serializable

If two instances of Random are created with the same seed, and the same sequence of method calls is made for each, they will generate and return identical sequences of numbers.

Many applications will find the random method in class Math simpler to use.

See Also:

random

Random()

Creates a new random number generator.

Random(long)

Creates a new random number generator using a single long seed.

next(int)

Generates the next pseudorandom number.

nextBytes(byte[])

Generates a user specified number of random bytes.

nextDouble()

Returns the next pseudorandom, uniformly distributed double value between 0.0 and 1.0 from this random number generator's sequence.

nextFloat()

Returns the next pseudorandom, uniformly distributed float value between 0.0 and 1.0 from this random number generator's sequence.

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.

nextInt()

Returns the next pseudorandom, uniformly distributed int value from this random number generator's sequence.

nextLong()

Returns the next pseudorandom, uniformly distributed long value from this random number generator's sequence.

setSeed(long)

Sets the seed of this random number generator using a single long seed.

public Random()

Creates a new random number generator. Its seed is initialized to a value based on the current time.

See Also:

currentTimeMillis

public Random(long seed)

Creates a new random number generator using a single long seed.

Parameters:

seed - the initial seed.

See Also:

setSeed

public synchronized void setSeed(long seed)

Sets the seed of this random number generator using a single long seed.

Parameters:

seed - the initial seed.

protected synchronized int next(int bits)

Generates the next pseudorandom number. Subclass should override this, as this is used by all other methods.

Parameters:

bits - random bits

Returns:

the next pseudorandom value from this random number generator's sequence.

public void nextBytes(byte bytes[])

Generates a user specified number of random bytes.

public int nextInt()

Returns the next pseudorandom, uniformly distributed int value from this random number generator's sequence.

Returns:

the next pseudorandom, uniformly distributed int value from this random number generator's sequence.

public long nextLong()

Returns the next pseudorandom, uniformly distributed long value from this random number generator's sequence.

Returns:

the next pseudorandom, uniformly distributed long value from this random number generator's sequence.

public float nextFloat()

Returns the next pseudorandom, uniformly distributed float value between 0.0 and 1.0 from this random number generator's sequence.

Returns:

the next pseudorandom, uniformly distributed float value between 0.0 and 1.0 from this random number generator's sequence.

public double nextDouble()

Returns the next pseudorandom, uniformly distributed double value between 0.0 and 1.0 from this random number generator's sequence.

Returns:

the next pseudorandom, uniformly distributed double value between 0.0 and 1.0 from this random number generator's sequence.

public synchronized 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.

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.

All Packages  Class Hierarchy  This Package  Previous  Next  Index