面向对象概念：类与对象

1、类是Java面向对象编程的基本元素，它定义了一个对象的结构和功能

2、构造方法

3、类继承，this和super

4、类变量(static类型)、方法和实例变量、方法

5、方法覆盖和重载、抽象类与接口

6、面向对象特性

7、面向对象设计原则

-Object-oriented concepts: Classes and Objects, classes are the basic elements of the Java object-oriented programming, which defines the structure and function of an object' s constructor, class inheritance, " This"　and " the super 4-class variable (static type) methods and instance variables, methods, methods cover and overloading, abstract classes and interfaces 6, object-oriented features, object-oriented design principles