public static void main(String[] args) {
        List<Integer> numList = new ArrayList<Integer>();
        numList.add(20);
        numList.add(32);
        numList.add(21);
        numList.add(13);
        numList.add(6);
        numList.add(16);

        int maxNum = Collections.max(numList);
        int minNum = Collections.min(numList);

        System.out.println("元數據：" + numList);
        System.out.println("最大值："+maxNum+" 索引：" + numList.indexOf(maxNum));
        System.out.println("最小值："+minNum+" 索引：" + numList.indexOf(minNum));
    }

元數據：[20, 32, 21, 13, 6, 16]
最大值：32 索引：1
最小值：6 索引：4