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clarify the nextInt/nextLong boundaries (thanks oOo)

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This commit is contained in:
jrandom
2004-08-29 22:42:21 +00:00
committed by zzz
parent 53c7ff14df
commit 07ef3582f7
4 changed files with 7 additions and 9 deletions
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8
core/java/src/net/i2p/util/RandomSource.java
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@ -33,7 +33,7 @@ public class RandomSource extends SecureRandom {
* According to the java docs (http://java.sun.com/j2se/1.4.1/docs/api/java/util/Random.html#nextInt(int))
* nextInt(n) should return a number between 0 and n (including 0 and excluding n). However, their pseudocode,
* as well as sun's, kaffe's, and classpath's implementation INCLUDES NEGATIVE VALUES.
* WTF. Ok, so we're going to have it return between 0 and n, since
* WTF. Ok, so we're going to have it return between 0 and n (including 0, excluding n), since
* thats what it has been used for.
*
*/
@ -41,18 +41,18 @@ public class RandomSource extends SecureRandom {
if (n == 0) return 0;
int val = super.nextInt(n);
if (val < 0) val = 0 - val;
if (val > n) val = val % n;
if (val >= n) val = val % n;
return val;
}
/**
* Like the modified nextInt, nextLong(n) returns a random number from 0 through n,
* inclusive.
* including 0, excluding n.
*/
public long nextLong(long n) {
long v = super.nextLong();
if (v < 0) v = 0 - v;
if (v > n) v = v % n;
if (v >= n) v = v % n;
return v;
}