Abstraction
| Abstraction |
Security |
| Data Hiding | |
| Encapsulation | |
| Tightly coupled classes | |
| Inheritance |
Code Reusability |
| Polymorphism | |
| Has a relationship | |
using a abstract class (0% – 100%) to achive abstraction
Using interface (100%) abstraction
A method without body (no implementation ) is known as abstraction method
A method must always be declared in an abstract class, or we can say that if a class has an abstract method if should be declared as abstract as well
abstract class Vechicle
{
int no of jeres; // 100% abstraction
abstract void start();
}
if a regular class extends an abstraction class, then the class, then the class must have to implements all the abstract methods of abstract parent or it has to be declared abstract as well
class car extends Vehicla
{
void start()
{
System.out.println(“Car Start”);
}
}
abstract method in a abstract class are meant to be overridden in derived concrete classes otherwise compile-time error will be thrown
class Scooter
extends Vehicla
{
void start()
{
System.out.println(“Kick”);
}
}
Abstract classes cannot create objects