Prerequisite : Overloading
Java can distinguish the methods with different method signatures. i.e. the methods can have same name but with different parameters list (i.e. number of the parameters, order of the parameters, and data types of the parameters) within the same class.
- Overloaded methods are differentiated based on the number and type of the parameters passed as an arguments to the methods.
- You can not define more than one method with the same name, Order and the type of the arguments. It would be compiler error.
- The compiler does not consider the return type while differentiating the overloaded method. But you cannot declare two methods with the same signature and different return type. It will throw a compile time error.
If both methods have same parameter types, but different return type, then it is not possible. (Java SE 8 Edition, §8.4.2)
Why do we need Method Overloading ??
If we need to do same kind of the operation with different ways i.e. for different inputs. In the example described below, we are doing the addition operation for different inputs. It is hard to find many different meaningful names for single action.
Different ways of doing overloading methods
Method overloading can be done by changing:
- The number of parameters in two methods.
- The data types of the parameters of methods.
- The Order of the parameters of methods.
Method 1: By changing the number of parameters.
sum of the two integer value :3 sum of the three integer value :6
Method 2: By changing the Data types of the parameters
sum of the three integer value :6 sum of the three double value :6.0
Method 3: By changing the Order of the parameters
geekName :Mohit Id :1 geekName :shubham Id :2
What happens when method signature is same and the return type is different?
The compiler will give error as the return value alone is not sufficient for the compiler to figure out which function it has to call. More details:Java Language Specification: §8.4.2.
Only if both methods have different parameter types (so, they have different signature), then Method overloading is possible.
16: error: method add(int,int) is already defined in class Addition public double add(int a, int b) ^ 1 error
This article is contributed by Nitsdheerendra. If you like GeeksforGeeks and would like to contribute, you can also write an article using contribute.geeksforgeeks.org or mail your article to firstname.lastname@example.org. See your article appearing on the GeeksforGeeks main page and help other Geeks.
Please write comments if you find anything incorrect, or you want to share more information about the topic discussed above.
- Difference between Method Overloading and Method Overriding in Java
- Method overloading and null error in Java
- Method Overloading with Autoboxing and Widening in Java
- Method Overloading and Ambiguity in Varargs in Java
- Overloading in Java
- Constructor Overloading in Java
- Output of Java program | Set 22 (Overloading)
- GFact 48 | Overloading main() in Java
- Overloading of Thread class run() method
- Java Function/Constructor Overloading Puzzle
- Different ways to create objects in Java
- Sort a String in Java (2 different ways)
- 10 Ways to Create a Stream in Java
- Different ways of Reading a text file in Java
- Ways to read input from console in Java
Improved By : Arijit Nath 1