Java Environment

     Java environment includes a large number of development tools and hundreds of classes and methods. The development tools are of the system known as :

• Java Development Kit(JDK)
• The classes and methods are part of the Java Standard Library(JSL),also known as the Application Programming Interface(API).

Java Development Kit

The Java Development Kit comes with a collection of tools that are used for developing and running Java programs.They include:

appletviewer

javac (Java Compiler)

java (Java interpreter)

javap(Java disassemble)

javah(for C header files)

javadoc(for creating HTML documents)

jdb(Java debugger)

Tool	Description
appletviewer	Enables  to run Java applets(without actually using a Java-compatible browser).
java	Java interpreter, which runs applets and application by reading and interpreting bytecode files.
javac	Java Compiler, which translates Java source code to Bytecode files that the interpreter can understand
javadoc	Creates HTML format documentation from Java source Code files.
javah	Produces header files for use with native methods.
javap	Java disassembler, which enables to covert bytecode Files into a program description.
jdb	Java debugger, which helps us to find errors in our programs

    

To create Java Program,need to be create a source file using a text editor.The source code is then compiled using the Java compiler Javac and executed using the java interpreter java The Java debugger jdb is used to find errors,if any in the source code.A compiled Java Program can be converted into a source code with the help of Java disassembler javap. Following figure shows the complete flow of java program.

Application Programming Interface

The Java Standard Library(or API) includes hundreds of classes and methods grouped  into several functions. Most commonly used packages are:

Language Support Package(java.lang) :

A collection of classes and methods required for implementing basic features of Java

Utilities Package (java.util):

A collection of classes to provide utility functions such as date and time functions.

Input/Output Package (java.io):

A collecton of classes required for input/output manipulation.

Networking Package (java.net):

A collection of classes for communicating with other computers via Internet.

AWT Package (java.awt) :

The abstract Window Tool Kit Package contain classes that implements platform-independents graphical user interface.

Applet Package (java.applet) :

This is includes a set of classes that allows us to create.Java applets.

The use of these library classes will become obvious when we start developing Java programs

Posted by : Ruchita Pandya