1. HashMap<Integer, Foo> foos;
2. Foo foo;
3. 
   
4. public void setup() {
5.   foos = new HashMap<Integer, Foo>();
6.   createFoos();
7.   displayFooName(299);
8.   displayFooName(666);
9.   displayFooName(111);
10.   displayFooName(202);
11. }
12. 
    
13. public void displayFooName(int fooID) {
14.   foo = foos.get(fooID);
15.   if (foo != null)
16.     println(foo.name);
17.   else
18.     println("Can't find foo " + fooID);
19. }
20. 
    
21. public void createFoos() {
22.   foo = new Foo(701, "Pandora");
23.   foos.put(foo.id, foo);
24.   foo = new Foo(202, "PhiLho");
25.   foos.put(foo.id, foo);
26.   foo = new Foo(299, "Quarks");
27.   foos.put(foo.id, foo);
28.   foo = new Foo(888, "Lucky");
29.   foos.put(foo.id, foo);
30.   foo = new Foo(666, "Lucifer");
31.   foos.put(foo.id, foo);
32. }
33. 
    
34. public class Foo {
35.   int id;
36.   String name;
37. 
    
38.   public Foo(int pid, String pname) {
39.     id = pid;
40.     name = pname;
41.   }
42. }

... otherwise vehicles.get(2).loc.x will do it, assuming loc is public.