stream过滤和map的用法

    public static void main(String[] args) {
        List list = new ArrayList<>();
        list.add(new Pojo(1, "qx1"));
        list.add(new Pojo(2, "qx6"));
        list.add(new Pojo(3, "qx2"));
        list.add(new Pojo(5, "qx5"));
        list.add(new Pojo(6, "qx3"));
        list.add(new Pojo(4, "qx4"));
        List