java 从List中随机取出一个元素
List<Integer> list = new ArrayList<>();
Random random = new Random();
int num = random.nextInt(list.size());
list.get(num);
java 从List中随机取出一个元素
List<Integer> list = new ArrayList<>();
Random random = new Random();
int num = random.nextInt(list.size());
list.get(num);