INHERITANCE AND METHOD OVERRIDING

Inheritance can be defined as the process where one class acquires the properties (methods and fields) of another.

TYPES OF INHERITANCE :

1.  SINGLE INHERITANCE : When a class extends another one class only then we  call it a single inheritance.
2. MULTILEVEL INHERITANCE : Multilevel inheritance refers to a mechanism in OO technology where one can inherit from a derived class.
3. HEIRARCHICAL INHERITANCE  : In such kind of inheritance one class is inherited by many sub classes.
4. HYBRID INHERITANCE  : Hybrid inheritance is a combination of Single and Multiple inheritance.
   

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METHOD OVERRIDING

If subclass  has the same method as declared in the parent class, it is known as method overriding in java. It is used for runtime polymorphism.

Example :

class A{
void run(){System.out.println("A");}
}

class B extends A{
void run(){System.out.println("B");}

public static void main(String args[]){
B obj = new B();
obj.run();
}

Output :

B