Question

I am adding a value to my arraylist but it is showing error. Before adding the value I am displaying it first. The value is displaying but it is not adding to the arraylist. Please help me regarding this…

My Code:

static ArrayList<String> allfirstids;

ArrayList<String> list = List.get(i);
UserBO user = new UserBO();

user.firstid = Integer.parseInt(list.get(0));
user.secondid = Integer.parseInt(list.get(1));
System.out.print("Hello this is first id");
System.out.print(list.get(0));

allfirstids.add(list.get(0));
System.out.println("first ids"+allfirstids);

Thanks in advance…

Answer 1

before adding, please initialize arraylist.

 allfirstids = new ArrayList<String>();