Iterators

iterators.java

boolean r = isOrdered(Arrays.asList(1, 3, 5, 7));  // true
boolean r2 = isOrdered(Arrays.asList(1, 5, 5, 7)); // false
boolean r3 = isOrdered(Arrays.asList(5, 3, 6, 7)); // false

public static <T extends Comparable<T>> boolean isOrdered(Collection<T> collection) {
    final Iterator<T> i = collection.iterator();
    final Iterator<T> j = collection.iterator();
    j.next();

    while(j.hasNext())
        if(i.next().compareTo(j.next()) >= 0)
            return false;

    return true;
}