Java tutorial
//package com.java2s; import java.util.Set; public class Main { public static boolean intersects(Set<?> a, Set<?> b) { if (a.size() < b.size()) { for (Object obj : a) { if (b.contains(obj)) { return true; } } } else { for (Object obj : b) { if (a.contains(obj)) { return true; } } } return false; } }