Learn about Overloading in Java

1. (SCJP/OCJP) (SCWCD/OCWCD)
Jayanthi Mani M.S.
Introduction
Overloading in Java

2. Why learn Overloading?
 ‘Overloading’ is one of the crucial and fundamental
concepts of core Java
 The concept of ‘Overloading’ promotes clean Java coding

3. Example of Overloading
public int operator(int a, int b){
return a+b;}
public float operator(float a, float b){
return a+b;
}
Note the different
argument lists – first
method takes integers
as its argument
The second method
takes floating type
variables as its
argument

4. Facts of Overloading
 Only methods in Java can be overloaded
 Methods can be overloaded in the same class or sub-class
 Each overloaded method is considered to be a separate
method

5. Rules for Overloading
 In order for the method to be considered overloaded, the
argument list MUST be different
 Just changing the return type and access modifier of a
method is not enough to make it overloaded

6. Invoking Overloaded methods
As an example, when the compiler sees
operator(5, 3);
it calls this method
public int operator(int a, int b){
return a+b;
}

7. Overloaded methods can
 have a different return type
 have a different access
modifier(can be more restrictive)
 throw new or broader
exceptions BUT MUST
differ in the argument list
Summary