如何随机混淆一个数组?

我需要随机调整以下数组:

int[] solutionArray = {1, 2, 3, 4, 5, 6, 6, 5, 4, 3, 2, 1};

回答:

可以使用如下代码实现:

import java.util.*;

import java.util.concurrent.ThreadLocalRandom;

class Test

{

public static void main(String args[])

{

int[] solutionArray = { 1, 2, 3, 4, 5, 6, 16, 15, 14, 13, 12, 11 };

shuffleArray(solutionArray);

for (int i = 0; i < solutionArray.length; i++)

{

System.out.print(solutionArray[i] + " ");

}

System.out.println();

}

// Implementing Fisher–Yates shuffle

static void shuffleArray(int[] ar)

{

// If running on Java 6 or older, use `new Random()` on RHS here

Random rnd = ThreadLocalRandom.current();

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;

}

}

}

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