Java Vector : Secure reference to element

Coming from a C# Background I never used any pointers.

I'm creating a vector of contacts objects. What is the best way to create a separate vector which references to elements in the big vector?

From stackoverflow

• You can iterate through the old Vector and add the elements to a new Vector.

  Vector oldVector;
  Vector newVector = new Vector(oldVector.size());
  
  for (int i = 0; i < oldVector.size(); i++){
      // add logic to exclude items from the new vector if you need
      newVector.add(oldVector.get(i));
  }
  

  Now, both vectors contain references to the same objects. Calling:

  newVector.get(n).modifyInSomeWay();
  

  The change will be reflected in both lists.

  jjnguy : Ty for the syntax error fix!

  Henrik P. Hessel : I don't want to copy elements.

  jjnguy : This doesn't copy elements.

  Henrik P. Hessel : Okay, maybe I misunderstood the concept of a Vector. A Vector always contains references?!

  jjnguy : Exactly .

• Just add the same object reference to both Vectors!

  Contact myContact = getContact();
  
  Vector vectorOne = new Vector();
  Vector vectorTwo = new Vector();
  
  vectorOne.add(myContact);
  vectorTwo.add(myContact);
  

  There is only one instance of myContact, but many references to it.