Fibonacci Iterator function in Java 8

fibonacci.java

import java.util.Iterator;
import java.math.BigInteger;

class Main {
  public static Iterable<BigInteger> fibonacci(final long N) {
    return () -> new Iterator<BigInteger>() {
      private long cursor = 0;
      private BigInteger a = BigInteger.ZERO,
                         b = BigInteger.ONE;
      public boolean hasNext() {
        return cursor < N;
      }
      public BigInteger next() {
        ++cursor;
        final BigInteger temp = a;
        a = b;
        b = b.add(temp);
        return a;
      }
      public void remove() {
        throw new UnsupportedOperationException();
      }
    };
  }
  public static void main(final String[] args) {
    for (BigInteger e: fibonacci(100000)) {
      System.out.println(e);
    }
  }
}