Fibonacci Iterator

https://sites.google.com/site/furodet/tips-for-java-rookies/first-steps-with-java-iterator

public class Fibonacci implements Iterable<Integer> {

private class FibonacciIterator implements Iterator<Integer> {

        /** Last and last but one elements. */

private int b0 = 0, b1 = 1;

@Override

public boolean hasNext() {

return true;

}

@Override

public Integer next() {

int value = b0 + b1;

b0 = b1;

b1 = value;

return value;

}

@Override

public void remove() {}

}

@Override

public Iterator<Integer> iterator() {

return new FibonacciIterator();

}

}

https://gist.github.com/heslei/1983172
http://www.keithschwarz.com/interesting/code/?dir=fibonacci-iterator