ArrayList one = new ArrayList();

one.add("one");

one.add("two");

ArrayList two = new ArrayList();

two.add("three");

two.add("four");

one.addAll(two);

String[] elements = one.toArray();

String[] match = {"one", "two", "three", "four"};

_checkEqual(elements, match);

ArrayList three = new ArrayList();

three.add("five");

three.add("six");

one.addAll(2,three);

String[] elements2 = one.toArray();

String[] match2 = {"one", "two", "five", "six", "three", "four"};

_checkEqual(elements2, match2);

one = new ArrayList();

two = new ArrayList();

two.add("t");

one.addAll(0, two);

_checkEqual(one.get(0), "t");