shuffle an int array - Java Collection Framework

Java examples for Collection Framework:Array Random Value

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Description

shuffle an int array

Demo Code


//package com.java2s;

import java.util.Random;

public class Main {
    public static void main(String[] argv) {
        int[] array = new int[] { 34, 35, 36, 37, 37, 37, 67, 68, 69 };
        System.out.println(java.util.Arrays.toString(shuffle(array)));
    }/* www .j  a v a  2  s  .co  m*/

    public static Random random = new Random();

    public static int[] shuffle(int[] array) {

        for (int i = 0; i < array.length; i++) {
            int randomPosition = random.nextInt(array.length);
            int temp = array[i];
            array[i] = array[randomPosition];
            array[randomPosition] = temp;
        }

        return array;
    }

    public static void shuffle(long[] array, int startIndex, int endIndex) {
        assert (endIndex <= array.length && startIndex >= 0 && endIndex > 0);
        for (int i = startIndex; i < endIndex; i++) {
            int randomPosition = random.nextInt(endIndex - startIndex)
                    + startIndex;
            long temp = array[i];
            array[i] = array[randomPosition];
            array[randomPosition] = temp;
        }

    }
}

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