Cannot convert an element for a list ton Integer

Question

I have my list [1, 2, 999] I'm trying to change the the last element of my list by -999, I m getting an error message
int val = 999;
String s1 = (String)list.get(list.size()-1);
int s2 = Integer.parseInt(s1);
if(s2 == val)
     // Replace the value 999 by -999
     list.add(list.size(), -999);

Answer 1

ronisto wrote:
52 System.out.println("La position du dernier est: "+list.size());
53          
54          String s1 = (String)list.get(list.size()-1);Looks like the error is really on line 54. The error seems to be that the element in the list is an Integer, not a String. The best was to avoid this is to use generics:
List<Integer> numbers = new ArrayList<Integer>();http://java.sun.com/docs/books/tutorial/collections/index.html
http://java.sun.com/docs/books/tutorial/extra/generics/index.html