blob: bb6beae2a1379e7de29dd01c1d675cb05a9418d5 (
plain) (
blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
|
/**
* Copyright © 2014 Mattias Andrée (m@maandree.se)
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
package algorithms.shuffling;
import java.util.Random;
/**
* Bias free array shuffling class using Sattolo Cycles.<br>
* The is probably the best possible shuffling algorithm.
*/
public class SattoloShuffle
{
£>for T in boolean char byte short int long float double Object; do
/**
* Shuffles an array
*
* @param array The array to shuffle
* @param random The random generator to use
*/
public static void shuffle(£{T}[] array, Random random)
{
int i = array.length, j;
for (;;)
{
if (i-- == 1)
break;
£{T} temp = array[i];
array[i] = array[j = random.nextInt(i)];
array[j] = temp;
}
}
£>done
}
|
