Re: How would you invoke arrayList.get() through reflection in 1.4 ??

Daniel Pitts <>
Fri, 06 Nov 2009 12:46:20 -0800
S?bastien de Mapias wrote:


It seems to be pretty hard to invoke the List get(int) method through
reflection. I didn't manage to have my code working with my 1.4

Why? Why not use ((List)obj).get(i);
That is *much* easier than using reflection.

To sum up I do the following:

Method method;
method = [some more code...];
if (method.getReturnType().toString().equals("interface

  // how many refs does our List contain ?
  int n = sizeOfCollection(method.invoke(root, (Object[])null));

  // let's get the actual list
  Object list = method.invoke(root, (Object[])null);

  // now trying to invoke its 'get()' for every element it
  // contains:
  Class listClass = Class.forName(list.getClass().getName());
  Method m2 = listClass.getDeclaredMethod("get", ???); //<= what to
put here ?

  for (int i=0; i<n; i++) {
      Object o = m2.invoke(list, i); //<= doesn't compile

private int sizeOfCollection(Object obj)
  return new StringTokenizer(obj.toString(), ",").countTokens();

In Java5 I managed to reach a point where I could traverse
all references contained in a List, and display them, but in 1.4,
no way: if someone every succeeded doing that, I'd be glad to
hear how you did it... Thanks a lot in advance !


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