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Hey guys in this article, you will understand the difference between Method overloading and method overriding in Java with easy to understand example

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Method Overloading vs Method Overriding

Following are the difference between Method overloading and Method overriding

Method Overloading

Advantage of method overloading

Method overloading increases the readability of the program.

Different ways to overload the method

There are two ways to overload the method in java

1. By changing number of arguments
2. By changing the data type

In java, Method Overloading is not possible by changing the return type of the method only.

Why Method Overloading is not possible by changing the return type of method only?

In java, method overloading is not possible by changing the return type of the method only because of ambiguity.

Example

Following is an example that demonstrates the Method overloading

public class Calculate {
	
	public static void main(String[] args) {
		Calculate c = new Calculate();
		System.out.println(c.add(2, 4));
		System.out.println(c.add(2.5, 4.5));
	}
	
	public int add(int a, int b) {
		return a + b;
	}
	
	public double add(double a, double b) {
		return a + b;
	}
}

Method Overriding

Usage of Java Method Overriding

• Method overriding is used to provide the specific implementation of a method which is already provided by its superclass.
• Method overriding is used for runtime polymorphism

Rules for Java Method Overriding

1. The method must have the same name as in the parent class
2. The method must have the same parameter as in the parent class.
3. There must be an IS-A relationship (inheritance).

Can we override static method?

No, a static method cannot be overridden. It can be proved by runtime polymorphism.

Why can we not override static method?

It is because the static method is bound with class whereas instance method is bound with an object. Static belongs to the class area, and an instance belongs to the heap area.

Can we override java main method?

No, because the main is a static method.

Example

Following is an example that demonstrates the Method overriding

class Parent{
    void display(){
        System.out.println("Parent");
    }
    void print(){
        System.out.println("Parent Print Method");
    }
}
class Child extends Parent{
    @Override
    void display(){
        System.out.println("Child");
    }
}
public class OverridingDemo{
    public static void main(String[] args) {
        Child objChild = new Child();
        objChild.display();
        //Parent method will be called
        objChild.print();
    }
}

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