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You can usually tell them because their notion of equality isn't based on identity, instead two value objects are equal if all their fields are equal.
The term has most likely gained widespread acceptance because of the need for a common and easily understood term that contrasts with complicated object frameworks.They are used to encapsulate many objects into a single object (the bean), so that they can be passed around as a single bean object instead of as multiple individual objects.A Java Bean is a Java Object that is serializable, has a nullary constructor, and allows access to properties using getter and setter methods.In the wake of that, HP made the decision to revive the line for a limited time.In addition, HP plans on dividing its web OS arm into two separate units reporting to different areas of the company, according to two leaked memos that have made their way onto the Web.As designs using POJOs have become more commonly-used, systems have arisen that give POJOs some of the functionality used in frameworks and more choice about which areas of functionality are actually needed. In Patterns of Enterprise Application Architecture I described Value Object as a small object such as a Money or date range object.
Their key property is that they follow value semantics rather than reference semantics.
The name is used to emphasize that the object in question is an ordinary Java Object, not a special object, and in particular not an Enterprise Java Bean (especially before EJB 3).
The term was coined by Martin Fowler, Rebecca Parsons and Josh Mac Kenzie in September 2000: "We wondered why people were so against using regular objects in their systems and concluded that it was because simple objects lacked a fancy name.
Hewlett-Packard will apparently need close to two months to start fulfilling backorders for the (temporarily) revived Touch Pad tablet."It will take 6-8 weeks to build enough HP Touch Pads to meet our current commitments, during which time your order will then ship from this stock with free ground shipping," read an email sent to customers and reprinted in a Sept. "You will receive a shipping notification with a tracking number once your order has shipped."That would place the new Touch Pads in consumers' hands sometime in either late October or early November.
The reduced-price devices are not returnable, according to the email.
"The remainder of the web OS team, under Stephen De Witt, will continue to report into PSG."According to at least one analyst, flooding the market with additional Touch Pad devices could have significant benefits for HP going forward.