如何对List集合进行随机排列呢?

实现思路:
    Collections.shuffle方法即可实现对集合随机乱序

Collections.shuffle源码分析

public static void shuffle(list<?> list, Random rnd) {
    int size = list.size();
    if (size < SHUFFLE_THRESHOLD || list instanceof RandomAccess) {
        for (int i=size; i>1; i--)
            swap(list, i-1, rnd.nextInt(i));
    } else {
        Object arr[] = list.toArray();

        // Shuffle array
        for (int i=size; i>1; i--)
            swap(arr, i-1, rnd.nextInt(i));

        // Dump array back into list
        ListIterator it = list.listIterator();
        for (int i=0; i<arr.length; i++) {
            it.next();
            it.set(arr[i]);
        }
    }
}

Collections.shuffle示例

   List<Integer> list = new ArrayList<Integer>();
	list.add(888);
	list.add(999);
	list.add(777);

    //对list中的元素顺序进行随机修改
    Collections.shuffle(list);