9.2 Bring together if it will simplify the interface 汇集在一起 ​​ 是否可以简化接口

When two or more modules are combined into a single module, it may be possible to define an interface for the new module that is simpler or easier to use than the original interfaces. This often happens when the original modules each implement part of the solution to a problem. In the HTTP server example from the preceding section, the original methods required an interface to return the HTTP request string from the first method and pass it to the second. When the methods were combined, these interfaces were eliminated.

当两个或多个模块组合成一个模块时，可以为新模块定义一个比原始接口更简单或更易于使用的接口。当原始模块各自实现问题解决方案的一部分时，通常会发生这种情况。在上一部分的 HTTP 服务器示例中，原始方法需要一个接口来从第一个方法返回 HTTP 请求字符串并将其传递给第二个方法。当这些方法结合在一起时，这些接口就被淘汰了。

In addition, when the functionality of two or more classes is combined, it may be possible to perform some functions automatically, so that most users need not be aware of them. The Java I/O library illustrates this opportunity. If the FileInputStream and BufferedInputStream classes were combined and buffering were provided by default, the vast majority of users would never even need to be aware of the existence of buffering. A combined FileInputStream class might provide methods to disable or replace the default buffering mechanism, but most users would not need to learn about them.

另外，将两个或更多类的功能组合在一起时，可能会自动执行某些功能，因此大多数用户无需了解它们。Java I/O 库说明了这种机会。如果将 FileInputStream 和 BufferedInputStream 类组合在一起，并且默认情况下提供了缓冲，则绝大多数用户甚至都不需要知道缓冲的存在。组合的 FileInputStream 类可能提供禁用或替换默认缓冲机制的方法，但是大多数用户不需要了解它们。