Java Environment

Java Environment

Development tools-part of java development kit (JDK).

Classes and methods-part of Java Standard Library (JSL), also 

known as Application Programming Interface (API).

JDK:

Appletviewer ( for viewing applets)

Javac (Compiler)

Java (Interpreter)

Javap (Java disassembler)

Javah (for C header files)

Javadoc ( for creating HTML description)

Jdb (Java Debugger)

2. Application Package Interface (API)

Contains hundreds of classes and methods 

grouped into several functional packages:

Language Support Package

Utility Packages

Input/Output Packages

Networking Packages

AWT Package

Applet Package

The Evolution of Java

1. Java 1.0

2. Java 1.1 (Add new library, redefine applet 

handling and reconfigured many features.)

3. Java 2 (Second generation). Version no:1.2

 (Internal version number of java library). Also 

known as J2SE [ Java 2 Platform Standard 

Edition].

  - Add swing, the collection framework, 

enhanced JVM etc.

4. J2SE 1.3

5. J2SE 1.4

6. J2SE 1.5

7. J2SE 1.6

Versions of Java

Three versions of the Java 2 Platform, targetted at different uses

Java 2 Micro Edition (J2ME)

Very small Java environment for smart cards, pages, phones,

 and set-top boxes

Subset of the standard Java libraries aimed at limited size 

and processing power

Java 2 Standard Edition (J2SE)

The basic platform

J2SE can be used to develop client-side standalone

 applications or applets.

Java 2 Enterprise Edition (J2EE)

For business applications, web services, mission-critical systems

Transaction processing, databases, distribution, replication.