polymorphism vs encapsulation

name and instance methods of the same class have the same picker.(3) method return value and @ parameter typeThe message mechanism finds the return value type and parameter type of the method through the picker, so dynamic binding (example: sending a message to an object defined by an ID) requires that the implementation of a method of the same name have the same return value type and the same parameter type; otherwise, the runtime may not find the corresponding method error.There is one except

1. EncapsulationHiding the state information of an object inside an object does not allow the external program to access the information inside the object directly, but rather through the methods provided by the class to implement operations and access to internal information, that is, the set and get methods.There are two main meanings:(1) Hide the hidden.(2) exposing the exposure.2. InheritanceSubclasses inherit the behavior of the parent class.3. polymorphicThere are two types of

issue: Statement of bank account class, member variables include account number, depositor name, opening time, identity card numbers, deposit balance and other accounts information, member methods include account opening, deposit, withdrawal, inquiry (balance, details), sales and other operations.The main members are described belowpublic class Accounts { //account class private String name; Depositor name private double balance; Ac

JavaBasics-encapsulation, inheritance, polymorphism--Fast growth of small instancesAbstract:1. Objective: To simplify the complex things and to order the contents of Fanluan.2. Process: The same, similar to the same thing, the different content of the door class.3. Result: Class, interface.Packaging:1. Purpose: Peers, the scattered content of the attribution, control of authority.2. Procedure: Unify the pro

Three Characteristics of object-oriented encapsulation, inheritance, and Polymorphism Encapsulation: Hiding internal implementations and stabilizing external interfaces. Encapsulation is to define the class definition property definition method. Property encapsulates the setter get Method @ Property (nonatomic, retai

rights of the parent method (that is, access to the parent method cannot be reduced) If the parent class public Function Cry () {} Subclass protected function Cry () {} will error However, the access rights of subclasses can be magnified, such as: Parent class Private Function Cry () {} Subclass protected function Cry () {} can execute correctly Above is (Advanced article) PHP Object-oriented three characteristics of learning (encapsulation, inherita

Memory management of OC　　IOS7 used the MRC Manual memory Management and now uses ARC automatic memory management, which typically does not present a memory leak issue.Packaging　　Encapsulation is the choice of protecting your own code. The interfaces that will be used by others are left to be seen, and others are hidden. Increased readability, maintainability, and extensibility of the code.Put the code for others to see in the interface (. h or. m), no

members are treated separately, data is copied only once, and functions are put in the static area. 5. Type Infomation is put into vftable Ii. Construction Process of encapsulation model 1. static data is determined during the compilation period. All objects are copied to each other and are created first. 2. Go to the constructor and create vfptr and vftable first, that is, create virtual functions first. 3. Construct Data members in the declared or

which subclasses automatically share data and methods between parent classes. It is represented by the derivation function of the class. A class inherits all the descriptions of other classes directly, and can be modified and expanded. Inheritance has transitivity. Inheritance is divided into single inheritance (a subclass with only one parent) and multiple inheritance (a class has more than one parent class, and the current Rt-thread object system cannot support it). The objects of the class a

call is not present. One of the biggest changes here is the processing of a subclass prototype, which is given a reference to the parent prototype, which is an object.(8) Multiple inheritanceBy copying inheritance of an object property in this way, the properties and methods of multiple parent classes (objects) are copied to the subclass to implement inheritanceThree, polymorphicPolymorphism is the realization of a polymorphic processing mechanism by executing the logic by judging the parameter

PHP Object-Oriented Learning Objectives: fully understand the three main features of abstraction, encapsulation, inheritance, and multi-state image targeting: encapsulation, inheritance, and Polymorphism. First of all, a brief understanding of abstraction: When we first define a class, we actually extract the common attributes and behaviors of a class of things t

C # encapsulation, inheritance, and polymorphism, Encapsulation Encapsulates the attributes and implementation details of classes and objects, and only exposes interfaces to control the read and modify access levels of attributes in the program. Class provides three optional access levels: public, protected, and private. By setting different data access levels

PHP Object-Oriented Learning Objectives: fully understand the three main features of abstraction, encapsulation, inheritance, and multi-state image targeting: encapsulation, inheritance, and Polymorphism. First of all, a brief understanding of abstraction: When we first define a class, we actually extract the common attributes and behaviors of a class of things t

object-oriented three main features : encapsulation, inheritance, polymorphism.PackagingEncapsulate classes to make the class more secure so that some member variables cannot be accessed directly by the outside world.Method:1. Change the member variable to private.2. Make a member method in the class to access it indirectly.3. Add restrictions to this method4. Each member variable is encapsulated in the standard case.classren{ Public $name; Public $s