"Introduction to Programming (Java)" Maxim

★ The following important remarks/suggestions/maxims ...

★ The core of computer software development has two:Organization of the program (object-oriented technology), problem Solving (algorithm)。
★ Plato's Law : The world of classes exists independently, and the object world is created by classes.
★ Object-oriented technology simulates the real world of materialism by reversing the world of ideas.
★ I serve therefore I am in.

★learning by doing.

★ Calculation is simulation--Alan Kay (Alan Curtis Kay)

★ Program must be written for people to read, only occasionally let the machine execute--abelson andsussman[1]

★any fool can write codethat a computer can understand. Good programmers write code that humans canunderstand--martin Fowler

★ If the parameters of the method are directly given and do not need to access the data of an object, it is designed to be a static method.

★ Subtype is a parent type.

★ Subtypes (objects must) can be substituted for their parent type-the Richter substitution principle .

★ Polymorphic = Up Styling + method rewriting (programming Tips).

★ When rewriting the method of the parent class, persist in using @override.

★ Subclasses inherit all accessible members of their parent class.

★ Design, the code upward concentration.

★ As a reuse mechanism, delegation takes precedence over inheritance. --"Design pattern"

★ polymorphic = polymorphic variable + dynamic binding (System mechanism).

★ Users only need to understand the interface--parnas principle .

★software entities (classes, modules,functions,,etc.) should is open for extension,but closed for modification. A software entity (class, module blocks, functions, and so on) should be open for expansion and closed for modification. Ocp

★ Programming is difficult, not because it is not written, but because it is not clear.

★ Modify all member variables with private (make all Member Variables private.).

★ Modify any helper method with private. (Make any helper methods private).

★ Data down focus.

★favor polymorphic composition of objects overinheritance. Prefer to use polymorphic combinations of objects rather than class inheritance. --"design pattern"

★ Preferential use of standard library exceptions.

★ Do not use return, continue, or break in the finally clause.

★ Callbacks usually refer to executable blocks of code that can be passed as arguments to other code, or a reference to an executable code.

★first Learn computer and all the theory. Nextdevelop a programming style. Then forget all and just hack.--george Carrette.

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"Introduction to Programming (Java)" Maxim