Java Classes and Objects 1.1

Object >property>action>collection>instanc

What is the object? What is a property? What is the method? (Attributes form the core of an object, methods surround the property)

Oop>

> Encapsulation (encapsulation), which combines the attributes of an object with all the actions, as much as possible to mask the inner details of the object. Objective: To make the software errors localized, and to reduce the difficulty of error-checking and debugging.

> Inheritance (Inheritance), only single-inheritance in C + +, using interfaces (interface) to implement multiple inheritance. Super Class>subclass. (Subclasses access the parent class member through the Get/set method)

> Polymorphism (polymorphism), overriding (@override), overloading (@overload).

Three control access modifiers, public,private,protected. (Friendy)

Abstract class descriptor--abstract. Describes the abstraction of a class. Abstract classes cannot generate objects directly.

The ultimate class specifier--final. Describes the non-inheritance of the class. After all, the class cannot be inherited.

Java Classes and Objects 1.1