Bsp: Generische Klasse in Java

class Pair<A,B> {
  final A first; final B second;
  Pair(A a, B b) 
    { this.first = a; this.second = b; }
}
Pair<String,Integer> p = 
    new Pair<String,Integer>("foo", 42);
int x = p.second + 3;

vor allem für Container-Typen (Liste, Menge, Keller, Schlange, Baum, ...)