Java - Writing the body of an abstract class in the subclass constructor

Question

When defining an abstract class, it is possible to create an instance of that class by writing the body of the abstract methods at object definition, like this:

AbstractClass obj = new AbstractClass() {   
   protected String description() {   return this.description;   }   
};

I would like to do something similar, but inside the constructor of a sub-class. Something like this:

public class AbstractClass {
   String description;
   public AbstractClass(String description){
       this.description = description;
   }
   protected abstract String description();
}
public class ActualClass extends AbstractClass {
   public ActualClass(String description){
       super(description) {
       protected String description() {    return this.description;    }
       };
   }
}

Now, the code above doesn't work. How could I do something similar?

Answer 1

You don't do it in constructor, but in the class itself:

public abstract class AbstractClass {
    String description;
    public AbstractClass(String description){
        this.description = description;
    }
    protected abstract String description();
}

public class ActualClass extends AbstractClass {
    public ActualClass(String description){
        super(description);
    }

    protected String description() {
        return this.description;
    }
}