waba.util
Class Random
java.lang.Object
|
+--waba.util.Random
- public class Random
- extends Object
This is a simple Linear Congruential Generator which
produces random numbers in the range [0,2^31), derived
from ran0 in Numerical Recipies. Note that ran0 isn't
wonderfully random -- there are much better generators
out there -- but it'll do the job, and it's fast and
has low memory consumption.
Constructor Summary |
Random()
Randomizes based on the current timestamp |
Random(int _seed)
The only reasonable seeds are between 0 and 2^31 inclusive; if
you're negative, it'll get the absolute value of it. |
Method Summary |
int |
getRandom(int n)
|
protected int |
next(int bits)
bits should be <= 31 |
float |
nextFloat()
Returns a floating-point value in the half-open range [0,1). |
int |
nextInt(int n)
Returns an integer in the range [0,n).
n must be > 0, else -1 is returned. |
char |
rand(char s,
char e)
Returns either random character in the given region.
|
int |
rand(int s,
int e)
Returns either random integer in the given region.
|
IA
public static final int IA
IM
public static final int IM
IQ
public static final int IQ
IR
public static final int IR
ZERO_SEED_REPLACEMENT
public static final int ZERO_SEED_REPLACEMENT
Random
public Random(int _seed)
- The only reasonable seeds are between 0 and 2^31 inclusive; if
you're negative, it'll get the absolute value of it.
Random
public Random()
- Randomizes based on the current timestamp
next
protected int next(int bits)
- bits should be <= 31
nextFloat
public float nextFloat()
- Returns a floating-point value in the half-open range [0,1).
nextInt
public int nextInt(int n)
- Returns an integer in the range [0,n).
n must be > 0, else -1 is returned.
getRandom
public int getRandom(int n)
rand
public char rand(char s,
char e)
- Returns either random character in the given region.
Eg: rand('a', 'e') returns a random character in the range of 'a' to 'e'.
Added by Imran Zahid
- Parameters:
s
- the start character in the rangee
- the ending character in the range
rand
public int rand(int s,
int e)
- Returns either random integer in the given region.
Eg: rand(1, 10) returns a random integer in the range of 1 to 10.
Added by Imran Zahid
- Parameters:
s
- the start number in the rangee
- the ending number in the range