A subclass can add its own type parameters.

  
class Gen<T> {
  T ob; // declare an object of type T

  Gen(T o) {
    ob = o;
  }

  // Return ob.
  T getob() {
    return ob;
  }
}

// A subclass of Gen that defines a second type parameter, called V.
class Gen2<T, V> extends Gen<T> {
  V ob2;

  Gen2(T o, V o2) {
    super(o);
    ob2 = o2;
  }

  V getob2() {
    return ob2;
  }
}

class HierDemo {
  public static void main(String args[]) {
    Gen2<String, Integer> x = new Gen2<String, Integer>("Value is: ", 99);

    System.out.print(x.getob());
    System.out.println(x.getob2());
  }
}

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A subclass can add its own type parameters. : Generic Parameter « Generics « Java

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