The first lesson in Java programming

Object: Owning state, behavior, identity

All things are objects.

Object calls the other by sending a message.

Each object can have other objects

Each object has an interface

Each object provides services to achieve this by invoking services provided by other objects

Hide Implementation Objects

2 roles: Creator of a class, client programmer (class consumer)

Hide Purpose: Create a class that exposes only the necessary parts to the client programmer and hides the other parts

Access control: Public private,protected

Reuse: Place an object of a class in a new class and become a composite

Inheritance: Multiplexing Interfaces

Copy it, based on an existing class, with all the behavior of the parent class

UML class diagram design staruml for software design

The first lesson in Java programming