Abstract Classes in Java

Abstract Class

A class which is declared with the abstract keyword is known as an abstract class in Java. It can have abstract and non-abstract methods.

Rules:

Must be declared with abstract keyword.

Cannot be instantiated (cannot create objects).

Can have constructors and static methods.

Can have final methods.

abstract class Bike {
  abstract void run();
}
class Honda extends Bike {
  void run() { System.out.println("running safely"); }
  
  public static void main(String args[]) {
   Bike obj = new Honda();
   obj.run();
  }
}