[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!!