Abstract Classes

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16.2 Abstract Classes

All the methods in an interface are abstract methods in the sense that the methods do not include implementation code.
Classes may include individual abstract methods by associating the abstract modifier with the methods and class declarations.

class Train extends Transport{
   String go(){  return ”Go. ”; }
}
abstract class Transport{
   abstract String go();
   String stop(){ return ”Stop.”; }
}
class TestTransport{
   public static void main(String [] args){
      Train train = new Train();
      System.out.println(
         train.go() +  train.stop()
      );
}  }

Go. Stop.

[TestTransport.java]