// generics/IterableFibonacci.java

// (c)2021 MindView LLC: see Copyright.txt

// We make no guarantees that this code is fit for any purpose.

// Visit http://OnJava8.com for more book information.

// Adapt the Fibonacci class to make it Iterable

import java.util.*;

public class IterableFibonacci

extends Fibonacci implements Iterable<Integer> {

private int n;

public IterableFibonacci(int count) { n = count; }

@Override public Iterator<Integer> iterator() {

return new Iterator<Integer>() {

@Override

public boolean hasNext() { return n > 0; }

@Override public Integer next() {

n--;

return IterableFibonacci.this.get();

}

@Override

public void remove() { // Not implemented

throw new UnsupportedOperationException();

}

};

}

public static void main(String[] args) {

for(int i : new IterableFibonacci(18))

System.out.print(i + " ");

}

}

/* Output:

1 1 2 3 5 8 13 21 34 55 89 144 233 377 610 987 1597

2584

*/