org.jgap

Interface RandomGenerator

All Superinterfaces:

java.io.Serializable

All Known Implementing Classes:

CauchyRandomGenerator, GaussianRandomGenerator, StockRandomGenerator

public interface RandomGenerator
extends java.io.Serializable

The RandomGenerator interface provides an abstraction for the random number implementation so that more rigorous or alternative implementations can be provided as desired.

ATTENTION: nextDouble should only return values betwen 0 (inclusive) and 1 (exclusive!). The same holds for nextFloat.

Since:

1.0

Field Summary

Fields

Modifier and Type	Field and Description
static java.lang.String	CVS_REVISION String containing the CVS revision.

Method Summary

Modifier and Type	Method and Description
boolean	nextBoolean() Returns the next pseudorandom, uniformly distributed boolean value from this random number generator's sequence.
double	nextDouble() Returns the next pseudorandom, uniformly distributed double value between 0.0 and 1.0 from this random number generator's sequence.
float	nextFloat() Returns the next pseudorandom, uniformly distributed float value between 0.0 and 1.0 from this random number generator's sequence.
int	nextInt() Returns the next pseudorandom, uniformly distributed int value from this random number generator's sequence.
int	nextInt(int a_ceiling) Returns a pseudorandom, uniformly distributed int value between 0 (inclusive) and the specified value (exclusive), drawn from this random number generator's sequence.
long	nextLong() Returns the next pseudorandom, uniformly distributed long value from this random number generator's sequence.

Field Detail

CVS_REVISION

static final java.lang.String CVS_REVISION

String containing the CVS revision. Read out via reflection!

See Also:

Constant Field Values

Method Detail

nextInt

int nextInt()

Returns the next pseudorandom, uniformly distributed int value from this random number generator's sequence. The general contract of nextInt is that one int value is pseudorandomly generated and returned. All 2^32 possible int values are produced with (approximately) equal probability.

Returns:

a pseudorandom integer value

Since:

1.0

nextInt

int nextInt(int a_ceiling)

Returns a pseudorandom, uniformly distributed int value between 0 (inclusive) and the specified value (exclusive), drawn from this random number generator's sequence. The general contract of nextInt is that one int value in the specified range is pseudorandomly generated and returned. All n possible int values are produced with (approximately) equal probability.

Parameters:

a_ceiling - the upper boundary excluded

Returns:

a pseudorandom integer value between 0 and the given ceiling - 1, inclusive

Since:

1.0

nextLong

long nextLong()

Returns the next pseudorandom, uniformly distributed long value from this random number generator's sequence. The general contract of nextLong() is that one long value is pseudorandomly generated and returned. All 2^64 possible long values are produced with (approximately) equal probability.

Returns:

a psuedorandom long value

Since:

1.0

nextDouble

double nextDouble()

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

Returns:

a psuedorandom double value GREATER/EQUAL 0 AND LESS THAN 1

Since:

1.0

nextFloat

float nextFloat()

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

Returns:

a psuedorandom float value

Since:

1.0

nextBoolean

boolean nextBoolean()

Returns the next pseudorandom, uniformly distributed boolean value from this random number generator's sequence. The general contract of nextBoolean is that one boolean value is pseudorandomly generated and returned. The values true and false are produced with (approximately) equal probability.

Returns:

a pseudorandom boolean value

Since:

1.0