可以使用Groovy来构建公共的不可变域版本的address类，这带来的是一种非常清晰的实现，如清单6所示。

Building the public-immutable-field version of the Address class in Groovy yields a nice clean implementation, shown in Listing 6.

youdao

域的范围是可变的，可以从单元、集群或节点，到节点组或应用程序服务器。

The scope of the domain is variable and can range from a cell, cluster, or node to a node group or application server.

youdao

但在那之后，我意识到了，如果域是不可变的话，则无需担心它们被暴露出来。

But then I realized that you don't need to worry about exposing fields if they are immutable.

youdao