package iterator;
import java.util.*;

public class Multiple implements Iterable<Integer> {
	private int multiplesOf, maximum;
	
	public Multiple(int multiplesOf, int maximum) {
		this.multiplesOf = multiplesOf;
		this.maximum = maximum;
	}
	
	public Iterator<Integer> iterator() {
		return new TheIterator();
	}
	
	/* Inner class for iterator */
	public class TheIterator implements Iterator<Integer> {
		/* Notice: accessing outer class values */
		private int currentValue = multiplesOf;
			
		public boolean hasNext() {
			return currentValue<=maximum;
		}

		public Integer next() {
			int toReturn = currentValue;
			currentValue += multiplesOf;
			return toReturn;
		}

		public void remove() {
			throw new UnsupportedOperationException("Iterator remove is not implemented");
		}
	}
	
	public static void main(String[] args) {
		Multiple m3 = new Multiple(3, 100);
		for (Integer i : m3)
			System.out.print(i + " ");
		
		System.out.println();
		Multiple m4 = new Multiple(4, 100);
		for (Integer i : m4)
			System.out.print(i + " ");
		
		/* What would happen if we remove implements Iterable<Integer> */
	}
}