void (String[] args) { ArrayList<SortTest<?>> list = new ArrayList<SortTest<?>>(); SortTest<?> t1 = new SortTest<String>(""); list.add(t1); SortTest<?> t2 = new SortTest<Integer>(0); list.add(t2); Collections.sort<error descr="'sort(java.util.List<T>)' in 'java.util.Collections' cannot be applied to '(java.util.ArrayList<SortTest<?>>)'">(list)</error>; t1.compareTo<error descr="'compareTo(SortTest<capture<?>>)' in 'SortTest' cannot be applied to '(SortTest<capture<?>>)'">(t2)</error>; //this should be OK SortTest<?>[] arr = new SortTest<?>[0]; arr[0] = new SortTest<String>(""); }