import java.util.*;
public class Range implements Iterable {
    int lo, hi;
    public Range(int lo, int hi) { this.lo = lo; this.hi = hi; }
    public Iterator<Integer> iterator() {
        return new Iterator<>() {
            int i = lo;
            public boolean hasNext() {
                return i < hi;
            }
            public Integer next() {
                return i++;
            } };
    }
    public static void main(String[] args) {
        for(var n : new Range(10,15))
            System.out.println(n);
        Range r = new Range(10,15);
        Iterator<Integer> iter = r.iterator();
        while(iter.hasNext()) {
            System.out.println(iter.next());
        } } }