Android Phone

Android is an operating system for mobile devices such as smartphones and tablet computers. It is developed by the Open Handset Alliance led by Google.^[7][8]

Google purchased the initial developer of the software, Android Inc., in 2005.^[9] The unveiling of the Android distribution on November 5, 2007 was announced with the founding of theOpen Handset Alliance, a consortium of 84 hardware, software, and telecommunicationcompanies devoted to advancing open standards for mobile devices.^{[10][11][12][13]} Google released most of the Android code under the Apache License, a free software license.^[14]The Android Open Source Project (AOSP) is tasked with the maintenance and further development of Android.^[15]

Android consists of a kernel based on the Linux kernel, with middleware, libraries and APIswritten in C and application software running on an application framework which includes Java-compatible libraries based on Apache Harmony. Android uses the Dalvik virtual machinewith just-in-time compilation to run Dalvik dex-code (Dalvik Executable), which is usually translated from Java bytecode.^[16]

Android has a large community of developers writing applications ("apps") that extend the functionality of the devices. Developers write primarily in a customized version of Java.^[17]There are currently approximately 300,000 apps available for Android, from a total of 500,000 apps over the life of Android.^[18][19][20] Apps can be downloaded from third-party sites or through online stores such as Android Market, the app store run by Google.

Android was listed as the best-selling smartphone platform worldwide in Q4 2010 byCanalys^[21][22] with over 190 million Android devices in use by October 2011.^[23]

Tablet Pc

Like laptops, most early tablet computers were tablet-shaped computers which included many of the features of personal computers. These devices ran adapted versions of Microsoft Windows or desktop Linux and were capable of running many of the same applications. Most featured pen-based input.

In 2001 Microsoft announced a set of specifications for the Tablet PC, which popularized that term.^[1]

Windows - 8

Windows 8 is the codename for the next version of the Microsoft Windows computeroperating system following Windows 7.^[3] It has many changes from previous versions. In particular it adds support for ARM microprocessors in addition to the previously supported x86 microprocessors from Intel and AMD. A new Start Screen interface has been added that was designed for touchscreen input in addition to mouse, keyboard, and pen input.

Object-Oriented Programming Concepts

If you've never used an object-oriented programming language before, you'll need to learn a few basic concepts before you can begin writing any code. This lesson will introduce you to objects, classes, inheritance, interfaces, and packages. Each discussion focuses on how these concepts relate to the real world, while simultaneously providing an introduction to the syntax of the Java programming language.

What Is an Object?

An object is a software bundle of related state and behavior. Software objects are often used to model the real-world objects that you find in everyday life. This lesson explains how state and behavior are represented within an object, introduces the concept of data encapsulation, and explains the benefits of designing your software in this manner.

What Is a Class?

A class is a blueprint or prototype from which objects are created. This section defines a class that models the state and behavior of a real-world object. It intentionally focuses on the basics, showing how even a simple class can cleanly model state and behavior.

What Is Inheritance?

Inheritance provides a powerful and natural mechanism for organizing and structuring your software. This section explains how classes inherit state and behavior from their superclasses, and explains how to derive one class from another using the simple syntax provided by the Java programming language.

What Is an Interface?

An interface is a contract between a class and the outside world. When a class implements an interface, it promises to provide the behavior published by that interface. This section defines a simple interface and explains the necessary changes for any class that implements it.

What Is a Package?

A package is a namespace for organizing classes and interfaces in a logical manner. Placing your code into packages makes large software projects easier to manage. This section explains why this is useful, and introduces you to the Application Programming Interface (API) provided by the Java platform.

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