fizzbuzz

Main.java

/*
 * https://gist.github.com/kazuho/3300555
 */
import java.util.Iterator;

public class Main {
    public static void main(String[] args) {
        FizzBuzz fb = new FizzBuzz(30);
        for (String s: fb) {
            System.out.println(s);
        }
    }
}

interface Fizz {
    String get();
}

interface Buzz {
    String get();
}

class FizzBuzz implements Iterable<String> {
    Fizz fizz = new FizzStart();
    Buzz buzz = new BuzzStart();
    int count = 0;
    final int upto;
    
    public FizzBuzz(int upto) {
        this.upto = upto; 
    }
    
    class FizzStart implements Fizz {
        public String get() {
            fizz = new Fizz() {
                public String get() {
                    fizz = new Fizz() {
                        public String get() {
                            fizz = new FizzStart();
                            return "fizz";
                        }
                    };
                    return "";
                }
            };
            return "";
        }
    }
    
    class BuzzStart implements Buzz {
        public String get() {
            buzz = new Buzz() {
                public String get() {
                    buzz = new Buzz() {
                        public String get() {
                            buzz = new Buzz() {
                                public String get() {
                                    buzz = new Buzz() {
                                        public String get() {
                                            buzz = new BuzzStart();
                                            return "buzz";
                                        }
                                    };
                                    return "";
                                }
                            };
                            return "";
                        }
                    };
                    return "";
                }
            };
            return "";
        }
    }

    public Iterator<String> iterator() {
        return new Iterator<String>() {
            public boolean hasNext() {
                return count++ < upto;
            }

            public String next() {
                String f = fizz.get();
                String b = buzz.get();
                return (f.equals("") && b.equals("")) ? Integer.toString(count) : f + b;
            }

            public void remove() {
            }
        };
    }
}