What is Polymorphism?,Method overloading and Method overriding ?

Polymorphism:

Polymorphism is nothing but perform an single action by different ways.
Ex: A man will behave different in office ,home etc ,person is same but behaviour is different based on place.

We can achieve polymorphism in 2 ways:
MethodOver loading(compile time polymorphism)
Method Overring(Run time polymorphism)


Method Overloading:

If you overload static method in java , it is example for compile time polymorphism.

If a class have multiple methods by same name but different parameters in same class(single class), it is known as Method Overloading.

Sample Code:
public class MethodOverLoading {

    void test()
    {
        System.out.println("without any parameter");
    }
    void test(int a)
    {
        System.out.println("with one parameter");
    }
    void test(int a,int b)
    {
        System.out.println("without two parameter");
    }
   
public static void main(String[] args)
{
    MethodOverLoading mol=new MethodOverLoading();
    mol.test();
    mol.test(10);
    mol.test(10,20);
   
   
}
}

Output:
without any parameter
with one parameter
without two parameter

Main Points:
1) We cannot create a method inside a method
2) With same method name and same parameters are not allowed

+++++++++++++++++++++++++++++
Method Overriding:

Same method name with same signature in 2 dissrent calsses in method overriding.

Rule 1: you can only override method in sub class
Rule 2: You can not override method in same class.



Sample code:


class  Cbz extends MethodOverRiding_Bike
    {
         void splender()
            {
                System.out.println("am using splender bike from child class:");
            }   
    }

public class MethodOverRiding_Bike {

     void splender()
    {
        System.out.println("am using splender bike now:");
    }
   
   
     public static void main(String[] args) {
           
            MethodOverRiding_Bike morride=new Cbz();
            morride.splender();
        }
   
}

Output: am using splender bike from child class: