[JAVA] Merge two lists in Java

List<String> listA = new ArrayList<>();

list1.add("a1");

list1.add("a2");

List<String> listB = new ArrayList<>();

list2.add("b1");

list2.add("b2");

List<String> joinedAB = new ArrayList<>();

joinedAB.addAll(listA);

joinedAB.addAll(listB);

System.out.println(joinedAB);

// result !!

[a1, a2, b1, b2] 

😀

Thank you!!