overloading-------having same method name with different 
signatures.
 overriding--------methods name and signatures must be same.

OverLoading :  All the method will share the same name but 
it differes based on the parameter, type of parameter and 
number of parameter

Overriding : The method in the derived class the has the 
same name in the base class and it changes the behaviour or 
functionality of the method in the base class.

Overloading: Methods have different signature but same
behavior or functionality.

Overriding: Methods have same signature but different bevior
or functionality.

overloading has same method but different types of 
parameters, number of parameters.

overloading does not take return type to differentiate 
overloaded method.

ex:
int add(int a, int b)
int add(float a , float b)
are overloaded methods

overriding comes with inheritance concept.
here parent and child both contains the same method. and 
when execution takes place; child's method is called.

OVERLOADING is the process of declaring the methods having 
the same name but diff signatures. Signature means diff 
types & number of arguments.

OVERRIDING is the process of overwriting the methods of 
base class in Derived Class.

overriding: it just in inheritance  and the overriding
method must hold the same name and the same signatures .
the change maybe just in behavior .

overloading : maybe in inheritance or in other way but must
to do overloading must the method hold the same name and
must change signatures.
remark:we can not only change th return type.

1-OverLoading is Resolved at COMPILE TIME.But Overridding is
resolved at RunTime.

2-OverLoaded Methods Can Change Access specifiers.in
overridding the access level of overridden method(in derived
class) must not be more restrictive than that of overridden
method(of base class)

3-Overloaded methods can declare new exceptions.But
overridden method must not throw new exceptions than those
declared by overridden method.

overriding->
    1) method should be public.
    2)it need inheritance.
    3)it need virtual keyword before it declartion.
    4)it have same name with same parameter in diffrent   class.
    5)it require non-static method.
    6)method should have same datatype.
Overloading->
    1)method can be different access speicifier.
    2)it doesn't need inheritacne.
    3)all method should be in same class.
    4)method can have diffrent datatypes

OVERLOADING:- 1) overloaded methods have the same name but 
different parameter list.
2)a subclass method can overload a superclass method 

eg:-int add(int a, int b)
int add(float a , float b)
are overloaded methods



OVERRIDING:-
it just in inheritance  and the overriding
method must hold the same name and the same signatures .
the change maybe just in behavior .


The Cat class in the following example is the subclass and 
the Animal class is the superclass. The Cat class overrides 
eat() method inherited from Animal class.

public class Animal {

    public void eat() {
        System.out.println("Eat for Animal");
    }
}

public class Cat extends Animal {

    public void eat() {
        System.out.println("Eat for Cat");
    }
}

1-OverLoading is Resolved at COMPILE TIME.But Overridding is
resolved at RunTime.

2-OverLoaded Methods Can Change Access specifiers.in
overridding the access level of overridden method(in derived
class) must not be more restrictive than that of overridden
method(of base class)

3-Overloaded methods can declare new exceptions.But
overridden method must not throw new exceptions than those
declared by overridden

overloading-------having same function name but with
different signatures.
 overriding--------function name and signatures must be same.