基础查漏补缺

Arrays.asList(numArr) 数组转换为集合，numArr定义应该用包装类而不是基本数据类型。

        //错误
        int[] numArr = {3, 6, 5};
        Arrays.asList(numArr).forEach(num -> {
            System.out.println("num: " + num);
        });
        
        //正确
        Integer[] numArr = {3, 6, 5};
        Arrays.asList(numArr).forEach(num -> {
            System.out.println("num: " + num);
        });