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Part 1:
Basic Principles of Java Programming 2
I. Opening and closing principle
The simple point is that the new open, the change is closed. And should try to do without changing the module's source code, you can change the behavior of the module.
Ii. The principle of dependency inversion
The principle is to rely on abstraction rather than on detailed implementations.
third, the principle of interface isolation
The principle is not to use generic interfaces. Instead, different interfaces are used for different users.
iv. principle of substitution
The principle is that subclasses should be able to replace the parent class and appear wherever the parent class is now available.
Part 2:
Basic experience in class design
one, the class to be single
The meaning of the design of the class function to be single, a class should be descriptive of a class of extremely relevant properties and methods.
second, strengthen the cohesion, loose coupling
meaning means a class. Can be implemented within their own internal implementation, not to tune other classes, to minimize the dependency on other classes.
Three, good encapsulation
It means that the part that does not have to be opened is open to the outside. Suppose that the property of the class is set to private when the attribute permission is not determined, and then it is opened again when it is used.
Four, the granularity of the class should be reasonable
That means The Java specification suggests that a class should not be larger than 1000 rows, and that the size of a method should not exceed 100 rows.
the implementation class cannot rely on its use class
This means that a class is dependent (used or called) and has a class. Then there is one class that cannot, in turn, rely on the current class.
Vi. flexibility should be considered. Which is configurable, maintainable
meaning that the user's needs will be constantly changing, the late changes and maintenance is inevitable. Therefore, software development should consider flexibility.
Vii. Consider performance and scalability
The idea is to weigh the relationship between speed and resource consumption, and consider that software can be scaled within a certain range.
consider possible future changes, i.e. scalability
This means that extensibility means that the application can easily add new functionality.
Nine, to consider a reasonable re-use
It means to consider reuse as much as possible, but not to consider reuse. You can't throw away all the other design principles.
10, to reasonably consider the use of interfaces and abstract classes
The idea is to use the interface first, assuming that you want to constrain the behavior of the subclass and provide the public function for the subclass, using abstract classes.
11. Minimizing the number of interactions and interactions between classes and collaboration classes
This means that the class should not be called repeatedly, do not pass very much data each time.
12, the parent class should not know the information of the child class, the subclass must know the information of the parent class
13, access to the object must pass through the interface. You can't bypass the interface and go directly to the interview.
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