What is the use of java?

Introduction.

Java technology is a high-level programming and a platform independent language. Java is designed to work in the distributed environment on the Internet. Java has a GUI features that  provides you better "look and feel" over the C++  language, moreover it is easier to use than C++ and works on the concept of object-oriented programming model. Java enable us  to play online games, video, audio, chat with people around the world, Banking Application, view 3D image and Shopping Cart. Java find its extensive use in the intranet applications and other e-business solutions that are the grassroots of corporate computing. Java , regarded as the most well described and  planned language  to develop an applications for the Web.

Java is a well known technology which allows you for software designed and written  only once for an  "virtual machine" to run on a different  computers, supports various Operating System like Windows PCs, Macintoshes, and Unix computers. On the web aspect, Java is popular on web servers, used  by many of the largest interactive websites. Java is used to create standalone applications which may run on a single computer or in distributed  network. It is also be used to create a small application program based on applet, which is further used for Web page. Applets make easy and possible to interact with the Web page.

Java  Preferred Over Other Languages

 The Java is a high-level programming language  that can be supported by all of the following features:

Java  has  advantages over other languages and environments that make it suitable for just about any programming task.

The advantages of Java are as follows:

• Java is simple, easy to design , easy to write, and therefore easy to compile, debug, and learn than any other programming languages.
• Java is object-oriented, that is used to build modular programs and reusable code in other application.
• Java is platform-independent and flexible in nature. The most significant feature of Java is to run a program easily from one computer system to another. 
• Java works on distributed environment. It is designed to work on distributed computing , Any network programs in Java is same as sending and receiving data to and from a file.
• Java is secure. The Java language, compiler, interpreter and runtime environment are  securable .
• Java is robust. Robust means reliability. Java  emphasis on  checking for possible errors, as Java compilers are able to detect many error problem in program during the execution of respective program code.
• Java supports multithreaded. Multithreaded is the path of execution for a program to perform several tasks simultaneously within a program. The  java come with the concept of Multithreaded Program. In other languages, operating system-specific procedures have to be called in order to work on multithreading.

Java Technology Works

Java is a high-level programming language and powerful software platform. On full implementation of the Java platform gives you the following features:

• JDK Tools: The JDK tools provide  compiling, Interpreter, running, monitoring, debugging, and documenting your applications.  The main tools used are the Javac compiler, the java launcher, and the javadoc documentation tool.
• Application Programming Interface (API): The API provides the core functionality of the Java programming language. It gives a wide collection of useful classes, which is further used in your own applications. It provides basic objects and interface to networking and security, to XML generation and database access, and much more. 
• Deployment Technologies: The JDK software provides two type of deployment technology such as the Java Web Start software and Java Plug-In software for deploying your applications to end users. 
• Graphical User Interface Toolkits: The Swing and Java 2D toolkits provide us the feature of  Graphical User Interfaces (GUIs).
• Integrated Libraries: Integrated with various libraries such as the Java IDL API, JDBC API, Java Naming and Directory Interface TM ("J.N.D.I.") API, Java RMI, and Java Remote Method Invocation over Internet Inter-ORB Protocol Technology (Java RMI-IIOP Technology) enable database to access and changes of remote objects.

Java Technology Changes  Our Life

• Easy to Start:  Since Java programming language is completely based on  object-oriented language, it's easy very simple and easy to learn, especially for programmers already known with C or C++.
• Easy to write code: As compared to program metrics (class counts, method counts, and so on) tell us that a program written in the Java programming language can be four times smaller as compare to the same program written in C++.
• Write better code: The Java programming language encourages good coding practices, and manages automatic garbage collection which  helps you avoid memory leaks. Based on the concept of  object orientation, its Java Beans component architecture, and  wide-range, easily extendible, flexibility and API  can reuse existing, tested code and introduce fewer bugs.
• Develop programs and Time Safer: The Java programming language is easier and simpler than C++,  as such, manages your development time  upto twice as fast when writing in it. The programs will also require fewer lines of code.
• Platform Independencies: The program  keep portable and platform independent by avoiding the use of libraries written in other languages. 
• Write Once and Used in any Java Platform : Any Source code of Program  are written in the Java programming language, that is compiled into machine-independent byte codes and run consistently on any platform of java.
• Distribute software makes work easy : Using Java Web Start software, users will be able to launch own applications with a single click on mouse. An automatic version check initially  weather users are always up to date with the latest version of your software. If an update is available for it, the Java Web Start software will automatically update their installation.

Java Platform

Platform  is cross-combination of  hardware or software environment in which a program runs. We are already  known with  the most popular platform like Microsoft Windows, Linux, Solaris OS, and Macintoshes OS. The Java platform differs from other platforms, that is only software-only platform which  runs on other hardware-based platforms.

The Java platform has two components:

• The Java Virtual Machine(JVM)
• The Java Application Programming Interface (API)

The API is a vast collection of various software components that provide you many useful functionality to the application. It is grouped into logical collection  of related classes and interfaces; these logical collection  are known as packages.

The API and Java Virtual Machine insulate the program from  hardware.

Java work on platform-independent environment, the Java platform is bit slower than native code. However, new changes  in compiler and virtual machine  brings performance close to that of native code without posing any threatening to portability security.

All source code is  written in  text files (Notepad Editor) save with the .java extension in the Java programming      language.

The source files are compiled into .class files by the java compiler. A .class file  contains byte codes — the machine     language of the Java Virtual Machine (JVM). The java launcher tool  runs your application with an instance of the Java Virtual    Machine.

Schematic Flow of Java Software Development Life Cycle

JVM works on different Operating System . The  .class files(bytecode)  capable of running on various Operating System. There are some virtual machines, such as the Java Hotspots virtual machine that boost up your application performance at runtime . This include various tasks such as Efficiency of Programme and recompiling (to native code) which is  frequently used sections of code.

Java JVM, the same application is capable to run on multiple platforms.