獲取從一個ArrayList

Question

隨機值我有一個String陣列：

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

其中我轉換成一個數組列表：

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

我想從我的ArrayList中的隨機值。

Answer 1

使用Random類來做到這一點，方法的參數nextInt是要返回的隨機數的界限。它必須是正面的：

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