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Android (Operating System)

Android is a mobile operating system based on the Linux kernel and It is currently developed by Google. It is designed primarily for touchscreen mobile devices such as smartphones and tablet computers, with specialized user interfaces for televisions, cars and wrist watches.
The operating System uses touch inputs that loosely correspond to real-world actions, like swiping, tapping, pinching, and reverse pinching to manipulate on-screen objects, and a virtual keyboard. Despite being primarily designed for touchscreen input, it also has been used in game consoles, digital cameras, regular PCs and other electronics.

As of July 2013 the Google Play store has had over one million Android applications (short Form- Apps) published, and over 50 billion applications downloaded. At Google in 2014, the company revealed that there were over one billion active monthly Android users, up from 538 million in June 2013. As of 2015, Android has the largest installed base of all general-purpose operating systems.

Java (programming language)

Java is all-purpose programing language that's co occurring, class-based, object-oriented, and specifically designed to possess as few implementation dependencies as attainable. It's supposed to let application developers "write once, run anywhere" (WORA), which means that code that runs on one platform doesn't have to be compelled to be recompiled to run on another.
Java applications square measure usually compiled to bytecode which will run on any Java virtual machine (JVM) despite laptop design. Java is, as of 2015, one in every of the foremost common programming languages in use, significantly for client-server internet applications, with a reportable nine million developers.Java was originally developed by James goose at Sun Microsystems (which has since incorporated into Oracle Corporation) and discharged in 1995 as a core part of Sun Microsystems' Java platform. The language derives abundant of its syntax from C and C++, however it's fewer low-level facilities than either of them.

Source: Wikipedia