java - 在 Java 中改组数组时出错

Question

这是我目前的情况

int[] question = new int[25];

for (int i = 0; i < question.length; i++){
    question[i] = i+1;
}

Random rand = new Random();

int max = question.length-1, min = 1;

for(int i = 0; i < question.length; i++){
    int idx = rand.nextInt((max - min) + 1) + min;
    randg[i] = idx;
    question[i] ^= question[idx];
    question[idx] ^= question[i];
    question[i] ^= question[idx];

    if(question[i] == 0){
        System.out.println("Something went wrong!" + i + " " + idx);
    }
}

所以问题似乎是当 rand 值 (idx) 等于 i 时，对于交换...它只是将值替换为 0。

我该如何解决这个问题？

Answer 1

我知道的最快的修复；使用 Integer[], Arrays.asList(T...)和 Collections.shuffle(List)喜欢

Integer[] question = new Integer[25];
for (int i = 0; i < question.length; i++) {
    question[i] = i + 1;
}
System.out.println(Arrays.toString(question));
Collections.shuffle(Arrays.asList(question));
System.out.println(Arrays.toString(question));

或者，您可以使用您的代码添加

for(int i = 0; i < question.length; i++){
  int idx = rand.nextInt((max - min) + 1) + min;
  if (idx == i) {
    i--; 
    continue;
  }