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