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Questions and Answers
Үндсэн классын бүх талбарууд болон аргуудыг өвлөн авах механизм юу гэдэг вэ?
Хэд хэдэн төрлийн Өвлөлтийн механизм байдаг вэ?
Полиморфизм юу гэдэг вэ?
Абстракцийн талаар юу гэдэг вэ?
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Композицийн талаар юу гэдэг вэ?
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Инкапсуляцийн талаар юу гэдэг вэ?
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Полиморфизмийг ямар аргаар đạtалдаг вэ?
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Абстракцийн классын талаар юу гэдэг вэ?
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Композицийн төрөлүүд юу гэдэг вэ?
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Study Notes
Inheritance
- A mechanism in which one class can inherit the properties and behavior of another class
- The child class inherits all the fields and methods of the parent class
- The child class can also add new fields and methods or override the ones inherited from the parent class
- Types of inheritance:
- Single inheritance: A child class inherits from a single parent class
- Multiple inheritance: A child class inherits from multiple parent classes
- Multilevel inheritance: A child class inherits from a parent class that itself inherits from another parent class
- Hierarchical inheritance: A child class inherits from a parent class, and another child class inherits from the first child class
Polymorphism
- The ability of an object to take on multiple forms
- Achieved through method overriding or method overloading
- Method overriding:
- A child class provides a different implementation of a method already defined in its parent class
- The method name and signature are the same, but the implementation is different
- Method overloading:
- Multiple methods with the same name but different parameters
- The method to be called is determined by the number and type of parameters
Abstraction
- The concept of showing only the necessary information to the outside world while hiding the internal details
- Implemented through abstract classes and interfaces
- Abstract classes:
- Cannot be instantiated on their own
- Can have both abstract and concrete methods
- Can have state (fields)
- Interfaces:
- Cannot be instantiated on their own
- All methods are abstract
- No state (fields)
Composition
- A mechanism in which an object is made up of other objects
- The contained objects are not complete without the container object
- Types of composition:
- Containment: One object contains a collection of other objects
- Aggregation: One object contains a reference to another object
Encapsulation
- The concept of bundling data and methods that operate on that data within a single unit
- Implemented through classes and objects
- Benefits:
- Hides internal implementation details
- Improves code organization and structure
- Reduces data corruption and misuse
- Improves code reuse and modularity
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Description
Өгөгдлийн объект хүрээлэл, өвчлөл, дүрслэл, абстракцлагдсан, композици зэрэг олон объект хүрээлэлийн ажиглалтын үндсэн ойлголтуудыг эзэмшсэн.
