A Generic Subclass: a nongeneric class can be the superclass of a generic subclass : Generic Class Hierarchies « Generics « Java Tutorial

1. Java Tutorial
2. Generics
3. Generic Class Hierarchies

A nongeneric class can be the superclass of a generic subclass.

class NonGen {
  int num;

  NonGen(int i) {
    num = i;
  }

  int getNumber() {
    return num;
  }
}

class Gen<T> extends NonGen { 
  T ob; 
   
  Gen(T o, int i) { 
    super(i);
    ob = o; 
  } 
 
  T getObject() { 
    return ob; 
  } 
} 
 
public class MainClass { 
  public static void main(String args[]) { 
    Gen<String> w = new Gen<String>("Hello", 47);
   
    System.out.print(w.getObject() + " ");
    System.out.println(w.getNumber());
  } 
}

Hello 47