new ArrayList<>().add(q.getOpenId())
时间: 2024-05-07 22:20:01 浏览: 13
这行代码创建了一个新的 ArrayList 对象,并将 q.getOpenId() 的返回值添加到该列表中。然而,由于没有将创建的 ArrayList 对象分配给一个变量,因此该对象将被丢弃并且无法访问。因此,这行代码不会起到任何有意义的作用。如果要使用该列表,应该将其分配给一个变量,例如:
```
List<String> openIds = new ArrayList<>();
openIds.add(q.getOpenId());
```
相关问题
apache Lists.newArrayList<>() pom
This is a code snippet from the Apache Commons Collections library.
`Lists.newArrayList<>()` is a method call that creates a new ArrayList that can hold any type of object. The angle brackets (`<>`) indicate that the ArrayList is a generic type, meaning that it can hold any type of object, but the type must be specified when the list is initialized.
The `pom` part of the code is not related to the `Lists.newArrayList<>()` method call. It is likely referring to the Maven Project Object Model (POM) file, which is an XML file that contains information about a project and its dependencies. The `pom` file is used by Maven to build and manage the project.
apache Lists.newArrayList<>()
This code creates a new ArrayList instance using the generic type parameter `<E>` provided by the `List` interface in the Apache Commons Collections library. The `newArrayList<>()` method initializes the ArrayList with an initial capacity of 10. This method is useful when you want to create a new ArrayList instance and populate it with elements in a single step. For example:
```
List<String> myList = Lists.newArrayList("apple", "banana", "orange");
```
This creates a new ArrayList of Strings and populates it with the elements "apple", "banana", and "orange".