shuffle an array - Android java.lang

Android examples for java.lang:Array Element

  1. HOME
  2. Android
  3. java.lang
  4. Array Element

Description

shuffle an array

Demo Code

/*/*from   w ww .ja va 2 s  .c om*/
 * @(#)$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
 */
//package com.java2s;

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 Tutorials