Some points to remember about method overloading:


Method overloading cannot be done by changing the return type of methods.
The most important rule of method overloading is that two overloaded methods must have different parameters.

Method overloading has nothing to do with return-type

If there are two methods of the same signature within a class in the program, then Ambiguity Error comes, whether their return-type is different or not. This means that method overloading has no relation with return-type.

class Sample {
int disp(int x) {
return x;
}
double disp(int y) {
return y;
}
public static void main(String args[])
{
Sample s = new Sample();
System.out.println("value of x: " + s.disp(5));
System.out.println("value of y: " + s.disp(6.5)) ;
}
}

Output


In this way, we can define more than one Methods of the same name in a class called Method Overloading. The Java Compiler itself, based on the Data Type of the Arguments of the Methods, performs the appropriate method call for an object.

Overriding and overloading are the core concepts in Java programming. They are the ways to implement polymorphism in our Java program. Polymorphism is one of the OOP concepts.

Overriding vs Overloading

Overriding and overloading example
Here is an example of overloading and overriding in a Java program:

package com.journaldev.examples;

import java.util.Arrays;

public class Processor {

public void process(int i, int j) {
System.out.printf("Processing two integers: %d, %d", i, j);
}

public void process(int[] ints) {
System.out.println("Adding integer array" " + Arrays.toString(ints));
}

public void process(Objects[] objs) {
System.out.println("Adding integer array: " + Arrays.toString(objs));
}
}

class MathProcessor extends Processor {

@Override
public void process(int i, int j) {
System.out.println("Sum of integer is " + (i + j));
}

@Override
public void proces(int[] ints) {
int sum = 0;
for (int i: ints) {
sum += i;
}
System.out.println("Sum of integer array elements is " + sum);
}
}

Overriding
The process() method and int i, int j parameters in Processor are overridden in the child class MathProcessor. Line 7 and line 23:

public class Processor {

public void process(int i, int j) { /* ... */ }

}

/* ... */

class MathProcessor extends Processor {

@Override
public void process(int i, int j) { /* ... */ }

}

And process() method and int[] ints in Processor are also overridden in the child class. Line 11 and line 28:

public class Processor {

public void process(int[] ints) { /* ... */ }

}

/* ... */

class MathProcessor extends Processor {

@Override
public void process(Object[] objs) { /* ... */ }

}

Overloading
The process() method is overloaded in the Processor class. Lines 7, 11, and 15:

public class Processor {

public void process(int i, int j) { /* ... */ }

public void process(int[] ints) { /* ... */ }

public void process(Object[] objs) { /* ... */ }

}

Conclusion
In this article, we covered overriding and overloading in Java. Overriding occurs when the method signature is the same in the superclass and the child class. Overloading occurs when two or more methods in the same class have the same name but different parameters.

Instruction

Explore essential Java topics that assess comprehension of management concepts for building a solid foundation. Browse through the sorted topics and click to access the corresponding posts.

Chapter 1: Java Basics
1. Setting up your environment
2. The JVM (Java virtual machine)
3. How it all works
4. Your first Program
5. Java Comments
6. Code Structure
7. Introducing Data types and variables
8. Example
9. Reserved Keywords
10. Double Variable
11. Short variables and Float Variables
12. Operator Precedence
13. Storing Text Values
14. Receive and Read User Data in Java
15. The if Statement
16. The if .. else If statement
17. The nested if statement
18. Boolean values
19. Switch statement
20. Statement - loops and iteration arrays
21. Arrays and loops
22. sorting arrays
23. arrays and strings
24. Multi-dimensional arrays
25. functions and methods
26. classes and objects
27. Important statements

Chapter 2: Java Data Structures and Algorithms
1. An overview of Data Structures
2. Classification of Data Structures
3. An overview of Algorithms
4. Basic Terminology
5. Characteristics of an Algorithm
6. Time Complexity and Time Complexity Functions
7. Basic Concepts of Data Structures and Algorithms
8. What is An Array ?
9. Searching and Sorting Algorithms
10. Multi-dimensional Arrays and Matrix Multiplication
11. Singly Linked Lists - Search and Sort Algorithms
12. Doubly Linked and Circular Linked Lists and Algorithms
13. Stacks

Chapter 3: Java Web Development
1. Ajax Development with JavaScript
2. Creating the java package and Source File
3. Troubleshooting
4. Web Services
5. The entity Class and session Facade
6. Introduction JavaServer Faces
7. Introducing Ajax for Java
8. Connecting to a MySQL database
9. Application and Database Communication
10. Using JQuery to improve a Web page