13/06/27 03:15:37.97
The List Interface (The Java? Tutorials > Collections > Interfaces)
URLﾘﾝｸ(docs.oracle.com)
Here's a nondestructive form of this idiom, which produces a third List consisting of the second list appended to the first.
List<Type> list3 = new ArrayList<Type>(list1);
list3.addAll(list2);