Starting from today, I decided to officially learn the software design model.

Programming also has 4 ~ Over the past five years, it has been difficult to improve at the language level. Programming Language discovery is so fast that people have to sigh: I don't know, the world is changing fast :)
Tools and languages keep changing, but what remains unchanged is programming ideas. Whether java, c #, c ++, object-oriented programming ideas are very close and consistent. the software design model is an excellent material that can improve the programming ideology and design level. I used to know that some code should be written in that way, but I don't know why it should be written in that way. What are the advantages of writing in that way. only later will I know that it is a mode...
I used to be a PowerBuilder programmer who has been writing structured programs. Although PB also supports OO programming, I have rarely used it. Now I use C, however, many ideas are still original, and sometimes non-OO programs are being compiled using OO programming languages. Pay attention to this point later.
Come on, my goal is: OOP-> OOD-> OOA!