重温Java经典教程(The Java™ Tutorials)第三篇-Java语言-第二章-2.3接口Defining an InterfaceEvolving Interfaces（如何扩充接口）Default Methods（重点了解）
Defining an InterfaceAn interface declaration consists of modifiers, the keyword interface, the interface name, a comma-separated list of parent interfaces (if any), and the interface body. For exam...
