Trying to call an ArrayList from another method

Question

So, I have 2 methods that return each a list of the same type of my business layer object class.

I am trying to make a new method that creates a new ArrayList of also the same type and adds those 2 lists to it.

Would anyone know how to call these lists into that combined list? This don't seem to work.

public response getlist1() {
    ....

    return list1;
}

public response getlist2() {
    ....

    return list2;
}

public response getCombinedList() {
     ArrayList<...> = new ArrayList<...>();     
     combinedList.add(list1);                                                
     combinedList.add(list2);
     ...   
}

Possible duplicate of [How do I join two lists in Java?](https://stackoverflow.com/questions/189559/how-do-i-join-two-lists-in-java) — Ben, May 28 '18 at 12:25
Try this, combinedList.add(getlist1()); combinedList.add(getlist2()); — prisoner_of_azkaban, May 28 '18 at 12:28
replace `list1` with `getList1()` and `list2` with `getList2()` — Lino, May 28 '18 at 12:32
You may wish to brush up on the concept of variable scope (instance, class, local). If `list1` and `list1` cannot be found, they may be out of scope within `getCombinedList`. — KellyM, May 28 '18 at 12:38

score 4 · Answer 1 · answered May 28 '18 at 12:44

In this case, I would go with addAll method of the list:

public response getCombinedList(){
     ArrayList<...> = new ArrayList<...>();     
     combinedList.addAll(list1);                                                
     combinedList.addAll(list2);    
}

Trying to call an ArrayList from another method

1 Answers1