The reference jane can at any time be made to refer to an object, for example by using a User constructor and the keyword new:

jane = new User();

As the reference john is of the same type, referring to a User object, we could also write: 

jane = john;

The relationship between jane and john after this last statement is illustrated in Figure

Now suppose we make the userID variable in this object reference the string "Bridgend". (This could be done by assignment to userID, via a method.) This would mean that the userID variable in the object referenced by john and jane references the string  "Bridgend", since john and jane refer to the same object. The result is illustrated in Figure.

 Any changes to the state of an object affect the execution of code involving any of the object references.

If we require two objects with the same contents we should instead have written something like the following: 

User emma = new User("Cornes", "[email protected]");
User maria = new User("Cornes", "[email protected]");

In this case, changes made to one object would have no effect on the other object. This is illustrated in Figure.

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