package org.apidesign.sidemeanings;

 public abstract class Protected {

     int counter;

     Protected() {}

     protected void increment() {

         counter++;

     }

     public final void incrementTenTimes() {

         for (int i = 0; i < 10; i++) {

             increment();

         }

     }

     public final void assertCounter(int expected) {

         assert expected == counter : "Expected " + expected + " but was " + counter;

     }

     public static class Dirty extends Protected {

         // BEGIN: sidemeanings.Protected.Dirty

         protected void increment() {

             // implementation:

             counter++;

         }

         // END: sidemeanings.Protected.Dirty

     }

     public static abstract class Clean extends Protected {

         // BEGIN: sidemeanings.Protected.Clean

         protected abstract void increment();

         protected final void defaultIncrement() {

             counter++;

         }

         // END: sidemeanings.Protected.Clean

     }

 }