29-11-2012, 06:27 PM
About Java
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What is Java:
Java is a simple, distributed object oriented programming language which provides the security, High performance, robustness.
Java is a portable and Architectural neutral language which can be Interpreted.
Java is multithreaded and Dynamic language.
About Java:
Java is a Programming language originally developed by James Gosling at Sun Microsystems and released in 1995 as a core component of Sun Microsystems' Java Platform. The language derives much of its Syntax from c and C++ but has a simpler object Model and fewer low-level facilities. Java applications are typically compiled to bytecode(class file) that can run on any Java Virtual machine (JVM) regardless of computer architecture.
Why Software Developers Choose Java:
Java with its versatilty, efficiency, and portability, Java has become invaluable to developers by enabling them to:
• Write software on one platform and run it on virtually any other platform
• Create programs to run within a Web browser and Web services
• Develop server-side applications for online forums, stores, polls, HTML forms processing, and more
• Combine applications or services using the Java language to create highly customized applications or services
• Write powerful and efficient applications for mobile phones, remote processors, low-cost consumer products, and practically any other device with a digital heartbeat.
Goals in creation of Java:
There were five primary goals in the creation of the Java language
1. It should be "simple, object oriented".
2. It should be "robust and secure".
3. It should be "architecture neutral and portable".
4. It should execute with "high performance".
5. It should be "interpreted, threaded, and dynamic".
Architecture of Java:
Java's architecture arises out of four distinct but interrelated technologies:
• The Java programming language
• The Java class file format
• The Java Application Programming Interface
• The Java virtual machine
When you write and run a Java program, you are tapping the power of these four technologies. You express the program in source files written in the Java programming language, compile the source to Java class files, and run the class files on a Java virtual machine. When you write your program, you access system resources (such as I/O, for example) by calling methods in the classes that implement the Java Application Programming Interface, or Java API. As your program runs, it fulfills your program's Java API calls by invoking methods in class files that implement the Java API.