Arguments of all add() calls made on myVec must be of type MyClass or subclasses of MyClass. : generics « Utility Classes « SCJP

1. SCJP
2. Utility Classes
3. generics

import java.util.Vector;

public class MainClass {
  public static void main(String[] argv) {
    Vector<MyClass> myVec;
    myVec = new Vector<MyClass>();
    MyClass myClass = new MyClass();
    myVec.add(myClass);
    MySubclass sub = new MySubclass();
    myVec.add(sub);

  }
}

class MyClass {
}

class MySubclass extends MyClass {
}