Basic of Java programming

Basic of Java programming. Java2 is the second generation of the Java platform (first generation is the Java Development Kit). Java stand on a machine called JVM interpreter. JVM bytecode is to be read in the file. Classes of the program as a direct representation of the machine language program contains. Therefore, the language of the Java programming language known as portable as it can be run on various operating systems, as long as the operating system are included JVM.

The platform consists of a collection of Java libraries, JVM, classes loader packaged in a regular Java environment, and a compiler, debuger, and other devices are packaged in a Java Development Kit (JDK). Java2 is the generation now emerging from platformJava. In order to run a Java program, the file with the extension.'' Java'' to be compiled into bytecode file. To run the bytecode needed JRE (Java Runtime Environment) that allows users to run Java programs, just run, not to create a new code. JVM and JRE contains libraryJava used.

PlatformJava has three different editions, ie J2EE (Java2 enterprose Edition), J2ME (Java2 Micro Edition) and J2SE (Java2 Second Edition). J2EE is a group of multiple APIs (Application Programming Interface) from Java and technologies other than Java. J2EE is often regarded as middleware or technology that runs on the server, but actually J2EE is not limited to it. In fact J2EE also includes technologies that can be used in all layers of an information system. Implementation of J2EE provides base classes and APIs from Java to support the development of a standard routine for client and server applications, including applications that run in a web browser. J2SE is the basis of the Java environment, while J2ME is a library edition is designed to be used on devices like pagers and mobile phones.

Java is a language that is case sensitive pemrogrman which means writing use uppercase or lowercase letters in the code may mean another. For example, writing "System" will be interpreted differently by the "system" by the interpreter. Java does not like C + +, Java does not support procedural programming, but it supports object-oriented programming so that no class syntax in the source code.