Hackforge Academy

Explanation

Method Overloading same method name but different parameters in the same class.
We can change Number of parameters Type of parameters Order of parameters

Code:

class Calculator {
  int add(int a, int b) {
        return a + b;
    }
 int add(int a, int b, int c) {
        return a + b + c;
    }

double add(double a, double b){
        return a + b;
    }
}
//next slide

Explanation

Coding

Code:

public class Main {
    public static void main(String[] args) {
        Calculator obj = new Calculator();
   System.out.println(obj.add(10, 20));
System.out.println(obj.add(10, 20, 30));
System.out.println(obj.add(5.5, 2.5));
    }
}
}

Explanation

Method Overriding
Run-Time Polymorphism IT means child class provides its own implementation of parent class method.
Rules: 1.Method name must be same 2.Parameters must be same 3.Inheritance required

Code:

class Animal {
    void sound() {
    System.out.println("Animal makes sound");
    }
}

class Dog extends Animal {
    @Override
    void sound() {
        System.out.println("Dog barks");
    }
}

Explanation

Cont..

Code:

public class Main {
    public static void main(String[] args) {
        Animal obj = new Dog();    
        obj.sound();
    }
}