Java Array Shuffle shuffle(final Object[] array)

Description

shuffle

License

Apache License

Declaration

public static void shuffle(final Object[] array) 

Method Source Code

//package com.java2s;
/*/*from www  . jav  a 2s  .c  o m*/
 * @(#)$Id: ArrayUtils.java 3619 2008-03-26 07:23:03Z yui $
 *
 * Copyright 2006-2008 Makoto YUI
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 * 
 * Contributors:
 *     Makoto YUI - ported from jakarta commons lang
 */

import java.util.Random;

public class Main {
    public static void shuffle(final Object[] array) {
        final Random r = new Random();
        final int limit = array.length;
        for (int i = 0; i < limit; ++i) {
            swap(array, i, r.nextInt(limit));
        }
    }

    public static void shuffle(final int[] array) {
        final Random r = new Random();
        final int limit = array.length;
        for (int i = 0; i < limit; ++i) {
            swap(array, i, r.nextInt(limit));
        }
    }

    public static void shuffle(final Object[] array, final long seed) {
        final Random r = new Random(seed);
        final int limit = array.length;
        for (int i = 0; i < limit; ++i) {
            swap(array, i, r.nextInt(limit));
        }
    }

    public static void swap(final Object[] array, final int i, final int j) {
        Object o = array[i];
        array[i] = array[j];
        array[j] = o;
    }

    public static void swap(final int[] array, final int i, final int j) {
        int o = array[i];
        array[i] = array[j];
        array[j] = o;
    }
}

Related

1. shuffle(double[] arr, Random rnd)
2. Shuffle(double[] array)
3. shuffle(double[] array, Random r)
4. shuffle(double[][] kernel, long seed)
5. shuffle(final A source, final Random random)
6. shuffle(final Object[] values)
7. shuffle(final T[] arr)
8. shuffle(final T[] array)
9. shuffle(final T[] array)