java集合随机抽取3个不重复元素

ArrayList<Integer> list = new ArrayList<>(Arrays.asList(1,2,2,4,3,6,7,9,11,22,3,4));//随机对象Random random = new Random();int size = list.size();Set<Integer> totals = new HashSet<Int

Mr_Jin.

4350人浏览 · 2022-03-21 16:26:46

Mr_Jin. · 2022-03-21 16:26:46 发布

 ArrayList<Integer> list = new ArrayList<>(Arrays.asList(1,2,2,4,3,6,7,9,11,22,3,4));
       //随机对象
        Random random = new Random();
        int size = list.size();
        Set<Integer> totals = new HashSet<Integer>();
        ArrayList<Integer> resultList = new ArrayList<>();
        while (totals.size() < 3) {//获取3个
        //随机再集合里取出元素，添加到新哈希集合
            totals.add((int) list.get(random.nextInt(size)));
        }
        Iterator iterator = totals.iterator();
        while (iterator.hasNext()) {
            int next = (int) iterator.next();
            resultList.add(next);
        }