Example: Session

HttpSession session = request.getSession(true);

ShoppingCart previousItems = (ShoppingCart)session.getValue("previousItems");

if (previousItems != null) { doSomethingWith(previousItems);

} else {

previousItems = new ShoppingCart(...); doSomethingElseWith(previousItems);

}

• These session objects have a builtin data structure that let you store any number of keys and associated values

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