Combine multiple lists in Java

Question

If I want to make two lists into one in Java, I can use ListUtils.union(List list1,List list2). But what if I want to combine multiple lists?

This works

Answer 1

Use an ArrayList to list down all your Lists....

ArrayList arrl = new ArrayList();
List list1 = new ArrayList();
    list.add("one");
    list.add("two");
List list2 = new ArrayList();
    list.add("one1");
    list.add("two2");
    arrl.addAll(list1);
arrl.addAll(list2);
    System.out.println("After Copy: "+arrl);

Thats it your list will be made