Java Software Development Learning notes (i)

Note 1. Java is a modern programming language and is born
The Java language has good features (object-oriented) and the best price (free),
In the most appropriate place (on the web), and at the most appropriate time (just when the web is becoming popular).

2. May 1995, first edition
At the end of 1998, J2SDK

3. Abstraction is a key concept in computing
Object-oriented programming focuses on the recognition and application of abstraction
Abstraction is based on layering.
The bottom layer is the programming language, and the upper level is the abstraction in the standard class library, the topmost or several layers are the various abstractions created by the programmer
(Each layer of abstraction provides a high-level view of the system that implements the program)


4. Reuse
Abstract expression is a reusable concept or idea, without having to consider the implementation details.
With Java abstraction, you can't just stay on the Java Standard Class library. Programmers should be good at finding, learning, and using other very useful class libraries
and add to the development environment, even when necessary to build their own class library can be built.

5. Build the program
Create a complete program that includes:
The overall structure of the design program (using OOA and Ood to solve the Java program structure implementation problem, discovering and building abstraction is the key factor of system development can be reconstructed)
Create and combine pieces of your program (fill in the details with an imperative programming language)
Then test to see if the program works correctly
Learning programming skills, practice is the foundation.