import java.util.*; | |
class Simple { | |
public static void main(String[] args) { | |
class O {} | |
Map<O, String> someData = new HashMap<O, String>(); | |
Set<String> set = new HashSet<String>(); | |
Set<O> setO = new HashSet<O>(); | |
set.removeAll(<warning descr="'Set<String>' may not contain objects of type 'O'">someData.keySet()</warning>); | |
setO.removeAll(someData.keySet()); | |
} | |
} |