数组的随机改组

使用Collections改组原始类型的数组有点矫kill过正...

使用例如Fisher-Yates shuffle本身就很容易实现该功能：

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; } } } 问题来源于stack overflow