Chain of Responsibility で fizzbuzz

CoR.java

/**
 *
 */
package org.yoshiori.cor;



/**
 * @author yoshiori
 *
 */
public class CoR {

    /**
     * @param args
     */
    public static void main(String[] args) {
        AbstractHandler handler = new Fizz();
        handler.setNext(new Buzz())
               .setNext(new FizzBuzz())
               .setNext(new Default());
        for(int i =1 ; i < 100 ; i++ ){
            handler.fizzbuzz(i);
        }
    }

    static abstract class AbstractHandler{

        AbstractHandler next;

        public void fizzbuzz(int i) {
            if(!execute(i) && next != null){
                next.fizzbuzz(i);
            }
        }

        public AbstractHandler setNext(AbstractHandler next){
            this.next = next;
            return next;
        }

        abstract protected boolean execute(int i);
    }
    static class Fizz extends AbstractHandler{
        @Override
        protected boolean execute(int i) {
            if(i % 3 == 0 && i % 5 != 0){
                System.out.println("fizz");
                return true;
            }
            return false;
        }
    }
    static class Buzz extends AbstractHandler{
        @Override
        protected boolean execute(int i) {
            if(i % 5 == 0 && i % 3 != 0){
                System.out.println("buzz");
                return true;
            }
            return false;
        }
    }
    static class FizzBuzz extends AbstractHandler{
        @Override
        protected boolean execute(int i) {
            if(i % 3 == 0 && i % 5 == 0){
                System.out.println("fizzbuzz");
                return true;
            }
            return false;
        }
    }
    static class Default extends AbstractHandler{
        @Override
        protected boolean execute(int i) {
            if(i % 3 != 0 && i % 5 != 0){
                System.out.println(i);
                return true;
            }
            return false;
        }
    }

}