LibraryCallback (Spring Boot API)

函数接口:
这是一个函数接口, 因此可用作 lambda 表达式或方法引用的赋值目标。
```
@FunctionalInterface
public interface LibraryCallback
```
Callback interface used to iterate Libraries.

- 方法概要
  所有方法实例方法抽象方法
  修饰符和类型方法说明
  void library(Library library)
  Callback for a single library backed by a File.

- 方法详细资料
  - library
```
void library(Library library)
      throws IOException
```
    Callback for a single library backed by a File.
    参数:
    library - the library
    抛出:
    IOException - if the operation fails