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Write at the beginning Reference Black Horse Programmer c++ Core Programming 4. Classes and Objects 4.1 Packaging Encapsulation is one of the three object-oriented features of C++. Significance of 4.1.1 Packaging (1). Express the things in life by taking attributes and behaviors as a whole (2) Control of attributes and behaviors with priv ...

This article is the learning notes of Chapter 9 of fluent python. Object representation Two functions to get the string representation of an object: repr() For developers str() User oriented Need to be implemented separately__ repr__ And__ str__ Two methods. An example: vector Here is an example of vector in Mathematics: from array import ...

Expiration: Secrets of JAVA Training Chapter 1: Pain Secrets of JAVA Training Chapter II: Gradually Magic Secrets of JAVA Training Chapter III: Jedi Strike Back Secrets of JAVA Training Chapter IV: Closed-door Training Secrets of JAVA Training Chapter V: "Wage and Gallbladder" Secrets of JAVA Training Chapter VI: Battle JAVA Refinemen ...

1, Abstract 1. Brief description It's just a statement, not a realizationAbstract method: public abstract void act();, There is no method body and it ends directly. Abstract methods can only exist in abstract classes.Abstract class: public abstract class Test {}. The subclass inheriting the abstract class must override the methods (including ...

The book Thinking in C + + discusses object slicing as follows: if a derived class object is forcibly transformed upward into a base class by passing values instead of pointers and references, the derived class object will be cut into a base class object after upward transformation, that is, the unique member variables and methods in the derive ...