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/**
* Copyright © 2014 Mattias Andrée (maandree@member.fsf.org)
*
* 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.arrays;
import java.util.Random;
/**
* Bias free array shuffling class using Knuth Shuffle.<br>
* Sattolo Cycle is an improvement of this method.
*/
public class KnuthShuffle
{
£>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 = 0, j;
int n = array.length - 1;
for (;;)
{
if (i == n)
break;
£{T} temp = array[i];
array[i] = array[j = random.nextInt(n - i) + i + 1];
array[j] = temp;
i++;
}
}
£>done
}
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