Millised on abstraktsete klasside peamised funktsioonid ja rakendused objektorienteeritud programmeerimises?

Abstract classes in object-oriented programming are classes that are not intended to be instantiated directly, but serve as base templates for other classes.

Main functions of abstract classes:

• Define a common interface and basic behavior for a group of related classes.
• The ability to declare abstract methods (without implementation), which must be implemented by subclasses.
• Allow partial implementation of functionality inherited by child classes.

Applicability:

• When it is necessary to establish a common contract for different implementations.
• When part of the logic is common, and another part must be implemented in subclasses.

Example in Java:

abstract class Animal {
    abstract void makeSound(); // abstract method
    void breathe() {
        System.out.println("Breathes");
    }
}

class Dog extends Animal {
    void makeSound() {
        System.out.println("Woof-woof");
    }
}

Here, Animal cannot be created directly, but a Dog can be created that implements the makeSound method.