ForceTree.com: Collections in Apex: List, Maps and Sets

List<Account> listsample = [Select Id,Name from Account limit 5];
system.debug('The Account Name at index 0 is'+listsample[0].Name);
system.debug('The size of the list is'+listsample.size());
//Adding a element to the list
listsample.add(new Account(Name='testlistsample'));
system.debug('The size of the list now is'+listsample.size());
//Remove a element from the list
listsample.remove(5);
system.debug('The size of the list now is'+listsample.size());