Java tutorial
//package com.java2s; //License from project: Open Source License import java.util.ArrayList; import java.util.Collection; public class Main { public static <T> Collection<T> union(Collection<T> set1, Collection<T> set2) { Collection<T> union = new ArrayList<T>(); for (T t : set1) { union.add(t); } for (T t : set2) { union.add(t); } return union; } }