johnnyjjdd的博客

java 从一列对象中取其中某一列字段 Class Obj{ int id; string name; public Obj(id,name){} } List<Obj> list = Arrays.asList(new Obj(1, "aa"), new Obj(2, "bb"), new Obj(3, "cc")); List<String> names = list.stream().map(obj -> obj.getName()).collect(Collec