Encapsulation: a software object is a discrete package containing both the physical properties (data) and the functionality (behavior) that mimics its real-world counterpart.
封装：软件对象就是包含模拟真实世界的对象的物理属性(数据)和功能(行为)的离散包。
2
A Data Transfer object is a way to package a collection of values in a single object so they can be passed around economically.
数据传输对象是将一组值包装在一个对象中的方法，目的在于经济地传送这些值。
3
The object serialization of the java.io package is not the only way to serialize Java objects.