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What is Java?



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What is Java?
The first released of Java on Jan 23, 1996 by Sun Microsystems. Java is a computer programming language. It is a widely used programming language. It is the most popular programming language for Android Smartphone. It’s known as a high-level language because it can be read and written easily by humans. Once a program has been written, the high-level instructions are translated into numeric codes that computers can understand and execute. It enables programmers to write computer instructions using English-based commands instead of having to write in numeric codes.
Java was designed to have the look and feel of the C++ language, but it is simpler to use than C++ and enforces an object-oriented programming model. Java can be used to create complete applications that may run on a single computer or be distributed among servers and clients in a network. It can also be used to build a small application module or applet for use as part of a webpage.


Principles of Java
  • Java is object-oriented
  • The code is robust
  • Programs created in Java offer portability in a network
  • Developer can learn Java quickly


Java Platforms
There are three key platforms upon which programmers develop Java applications:



    J2SE: Simple, stand-alone applications are developed using Java Standard Edition. Formerly known as J2SE, Java SE provides all of the APIs needed to develop traditional desktop applications.    
     



    J2EE: The Java Enterprise Edition, formerly known as J2EE, provides the ability to create server-side components that can respond to a web-based request-response cycle. This arrangement allows the creation of Java programs that can interact with internet-based clients, including web browsers, CORBA-based clients and even REST- and SOAP-based web services.



    J2ME: Java also provides a lightweight platform for mobile development known as Java Micro Edition, formerly known as J2ME. Java ME has proved a very popular platform for embedded device development, but it struggled to gain traction in the Smartphone development arena. In terms of Smartphone development, Android has become the mobile development platform of choice.







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