Java Abstracts

abstract class Cat {


   //abstract classes can have variables
   String abstractClassName = "Cat"; 
     
   //abstract classes can have methods
   String getAbstractClassName() { 
      return abstractClassName; 
   }


   //this must be implemented in any class extending Cat
   abstract String getClassName();


}          


//you can not extend from two classes at once
class Himalayan extends Cat{         
  
   String className = "Himalayan";


   public Himalayan() {}   


   //must have this method, 
   //  because Cat declared it as an abstract
   String getClassName() { 
      return className; 
   }       


   public static void main(String[] args) {


      //you can not instantiate an abstract class
      //Cat percy = new Cat();  //does not work     


      Himalayan cappuccino = new Himalayan();
  
      System.out.println(cappuccino.getAbstractClassName());
      //output is: Cat
      System.out.println(cappuccino.getClassName());
      //output is: Himalayan
   }
}