class StoreSomething<A> {
  A something;
  
  StoreSomething(A something) {
    this.something = something;
  }
  
  void set(A something) {
    this.something = something;
  }
  
  A get() {
    return something;
  }
}

public class Test {

  public static void main(String[] args) {
     StoreSomething<String> a = new StoreSomething("I'm a string!");
     StoreSomething<int> b = new StoreSomething(17+4);

     b.set(9);

     int i = b.get();
     String s = a.get();
  }
}

class StoreString extends StoreSomething<String> { 
  StoreString(String something) {
    super(something);
  }
}

class StoreSomething2<A> extends StoreSomething<A> {
  
  StoreSomething2(A something) {
    super(something);
  }
  
  void print() {
    System.out.println(""+something);
  }
}