object graph

关于java8api 中object graph 的解释，资料来自苹果ios 开发doc。供自己参考

In an object-oriented program, groups of objects form a network through their relationships with each other—either through a direct reference to another object or through a chain of intermediate references. These groups of objects are referred to as object graphs. Object graphs may be small or large, simple or complex. An array object that contains a single string object represents a small, simple object graph. A group of objects containing an application object, with references to the windows, menus and their views, and other supporting objects, may represent a large, complex object graph.

Sometimes you may want to convert an object graph—usually just a section of the full object graph in the application—into a form that can be saved to a file or transmitted to another process or machine and then reconstructed. This process is known as archiving.