java - 从 ArrayList 获取随机值

Question

我有一个String数组:

String [] array={"1","2","3","4","5","6","7","8","9"};

我将其转换为数组列表:

 ArrayList<String> al = new ArrayList<String>(Arrays.asList(array));

我想从我的 ArrayList 中获取一个随机值。

Answer 1

使用Random类来做到这一点，方法nextInt的参数是要返回的随机数的界限。它必须是积极的:

Random random = new Random();
yourList.get(random.nextInt(yourList.size()));