Inheritance

Inheritance is the mechanism of basing an object or class upon another object or class, retaining similar implementation.

superclass (parent) - the class being inherited from subclass (child) - the class that inherits from another class

Example

/*
* Created: Ramaguru Radhakrishnan
* Date: 08-May-2023
*
*/
class Shape {

  // Method (does not have a body)
  public void area() { }

  // Method
  public void display() {
    System.out.println("[Super] Calculating Area");
  }

}

// Subclass (inherited from Shape)
class Circle extends Shape {

  public void area() {
     // area() of Circle Class - Definition
    System.out.println("[Circle] Area of Circle is PI*R*R");
  }

}

// Subclass (inherited from Shape)
class Rectangle extends Shape {

  public void area() {
    // area() of Rectangle Class - Definition
    System.out.println("[Rectangle] Area of Rectangle is L*B");
  }

}

public class Main {

  public static void main(String[] args) {

    System.out.println("[Main] Creating Objects Circle and Rectangle");

    Circle myCircle = new Circle(); // Create a Circle object
    myCircle.display();
    myCircle.area();

    Rectangle myRect = new Rectangle(); // Create a Rectangle object
    myRect.display();
    myRect.area();
  }

}