computer science

JavaPOS

JavaPOS is a computer science topic covered in the lgStudy science library. This page brings together a partial reference excerpt, illustrations, worked examples, real-world applications and a short study plan, so you can understand JavaPOS rather than just read about it. In short: JavaPOS (short for Java for Point of Sale Devices), is a standard for interfacing point of sale (POS) software, written in Java, with the specialized hardware peripherals typically used to create a point-of-sale system. The advantages are reduced POS terminal costs, platform independence, and reduced administrative costs.

Key takeaways

JavaPOS belongs to computer science; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect JavaPOS to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of JavaPOS from memory before moving on to harder problems.

Reference excerpt

JavaPOS (short for Java for Point of Sale Devices), is a standard for interfacing point of sale (POS) software, written in Java, with the specialized hardware peripherals typically used to create a point-of-sale system. The advantages are reduced POS terminal costs, platform independence, and reduced administrative costs. JavaPOS was based on a Windows POS device driver standard known as OPOS. JavaPOS and OPOS have since been folded into a common UnifiedPOS standard.

Types of hardware JavaPOS can be used to access various types of POS hardware. A few of the hardware types that can be controlled using JavaPOS are

POS printers (for receipts, check printing, and document franking) Magnetic stripe readers (MSRs) Magnetic ink character recognition readers (MICRs) Barcode scanners/readers Cash drawers Coin dispensers Pole displays PINpads Electronic scales

Parts In addition to referring to the standard, the term JavaPOS is used to refer to the application programming interface (API). The JavaPOS standard includes definitions for "Control Objects" and "Service Objects". The POS software communicates with the Control Objects. The Control Objects load and communicate with appropriate Service Objects. The Service Objects are sometimes referred to as the "JavaPOS drivers."

Control objects The POS software interacts with the control object to control the hardware device. A common JavaPOS library is published by the standards organization with an implementation of the Control Objects of the JavaPOS standard.

Service objects Each hardware vendor is responsible for providing Service Objects, or "JavaPOS drivers" for the hardware they sell. Depending on the vendor, drivers may be available that can communicate over USB, RS-232, RS-485, or even an Ethernet connection. The hardware vendors will typically create JavaPOS drivers that will work with Windows. The majority of vendors will also create drivers for at least one flavor of Linux, but not as many. Since there is not nearly as much marketshare to capture for Apple computers used as POS systems, only a few JavaPOS drivers would be expected to work with Mac OS X. (And those would be more likely due to happy circumstance rather than careful design.)

Historical background The committee that initiated JavaPOS development consisted of Sun Microsystems, IBM, and NCR. The first meeting occurred in April, 1997 and the first release, JavaPOS 1.2, occurred on 28 March 1998. The final release as a separate standard was version 1.6 in July 2001. Beginning with release 1.7, a single standards document was released by a UnifiedPOS committee. That standards document is then used to create the common JavaPOS libraries for the release.

See also Point of sale UnifiedPOS EFTPOS Point of sale display Point of Sale Malware

References

External links JavaPOS

Worked examples

Example 1 — a first encounter with JavaPOS

Start with the simplest possible case. Write down what JavaPOS claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In computer science, the smallest case is usually a single object, a single equation or a single measurement. Check that every symbol or term in your sentence has a meaning in that case.

Example 2 — changing one variable

Take the situation from Example 1 and change exactly one quantity: double it, halve it, or set it to zero. Predict what should happen to JavaPOS before you calculate. Comparing your prediction with the result is the fastest way to find out whether you understand the idea or only the words.

Example 3 — an exam-style question

Typical questions about JavaPOS ask you to (a) state it precisely, (b) apply it to given data, and (c) explain a limitation. Practise writing all three answers in under five minutes; the third part is what separates a full-mark answer from an average one.

Applications of JavaPOS

In research: JavaPOS appears in computer science research whenever the underlying quantities have to be modelled precisely. Papers usually cite it as a starting assumption and then explore where it breaks down.
In technology and industry: Engineering practice reuses JavaPOS in design rules, simulations and safety margins. Knowing the idea lets you read a specification sheet and understand why the numbers look the way they do.
In the classroom: JavaPOS is common in secondary-school and first-year university syllabi. It links to neighbouring topics Computer standards, Retail point of sale systems, so understanding it makes those chapters shorter.
In everyday life: Look for JavaPOS outside the textbook — in sport, cooking, traffic, electronics or the sky above you. An example you found yourself is remembered far longer than one you were given.

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How to study JavaPOS in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what JavaPOS means in your own words.
Compare your version with the excerpt and mark what you missed.
Work through the three examples above with pen and paper.
Explain JavaPOS out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is JavaPOS in simple terms?

Why does JavaPOS matter?

Because it connects several computer science ideas at once: it gives you a definition you can apply, a quantity you can calculate, and a way to check whether a result is plausible.

How should I study JavaPOS?

Read the excerpt, restate it from memory, then work through the examples and applications listed on this page. The five-step study plan above takes about twenty minutes.

What does this page cover?

It gives you a compact reference excerpt plus original lgStudy explanations, examples, applications and study material on JavaPOS.