Java Array Shuffle shuffleArray(T[] ar)

Description

shuffle Array

License

Open Source License

Declaration

public static <T> void shuffleArray(T[] ar) 

Method Source Code

//package com.java2s;
//License from project: Open Source License 

import java.util.Random;

public class Main {
    public static Random rnd = new Random();

    public static <T> void shuffleArray(T[] ar) {
        for (int i = ar.length - 1; i > 0; i--) {
            int index = rnd.nextInt(i + 1);
            // Simple swap
            T a = ar[index];//from  w w  w.  j av a2 s .c  o m
            ar[index] = ar[i];
            ar[i] = a;
        }
    }

    public static void shuffleArray(int[] ar) {
        for (int i = ar.length - 1; i > 0; i--) {
            int index = rnd.nextInt(i + 1);
            // Simple swap
            int a = ar[index];
            ar[index] = ar[i];
            ar[i] = a;
        }
    }

    public static void shuffleArray(long[] ar) {
        for (int i = ar.length - 1; i > 0; i--) {
            int index = rnd.nextInt(i + 1);
            // Simple swap
            long a = ar[index];
            ar[index] = ar[i];
            ar[i] = a;
        }
    }

    public static void shuffleArray(short[] ar) {
        for (int i = ar.length - 1; i > 0; i--) {
            int index = rnd.nextInt(i + 1);
            // Simple swap
            short a = ar[index];
            ar[index] = ar[i];
            ar[i] = a;
        }
    }

    public static void shuffleArray(byte[] ar) {
        for (int i = ar.length - 1; i > 0; i--) {
            int index = rnd.nextInt(i + 1);
            // Simple swap
            byte a = ar[index];
            ar[index] = ar[i];
            ar[i] = a;
        }
    }

    public static void shuffleArray(double[] ar) {
        for (int i = ar.length - 1; i > 0; i--) {
            int index = rnd.nextInt(i + 1);
            // Simple swap
            double a = ar[index];
            ar[index] = ar[i];
            ar[i] = a;
        }
    }

    public static void shuffleArray(float[] ar) {
        for (int i = ar.length - 1; i > 0; i--) {
            int index = rnd.nextInt(i + 1);
            // Simple swap
            float a = ar[index];
            ar[index] = ar[i];
            ar[i] = a;
        }
    }

    public static void shuffleArray(boolean[] ar) {
        for (int i = ar.length - 1; i > 0; i--) {
            int index = rnd.nextInt(i + 1);
            // Simple swap
            boolean a = ar[index];
            ar[index] = ar[i];
            ar[i] = a;
        }
    }

    public static void shuffleArray(char[] ar) {
        for (int i = ar.length - 1; i > 0; i--) {
            int index = rnd.nextInt(i + 1);
            // Simple swap
            char a = ar[index];
            ar[index] = ar[i];
            ar[i] = a;
        }
    }
}

Related

1. shuffleArray(int[] arr)
2. shuffleArray(int[] array, int length)
3. shuffleArray(int[] array, long rngSeed)
4. shuffleArray(List list)
5. shuffleArray(Object[] array)
6. shuffleArray(T[] arr)
7. shuffled(List list, Random random)
8. shuffledList(List list)
9. shuffleInPlace(E[] elems, Random rand)