javafeatures

7/28/2019 javafeatures

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1

Basics and Features of Java


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2

Objectives

On completion of this period, you would be able to

know

The features of Java Applets and Applications


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3

Recap

What is an applet?

Differentiate Java with C++

Why Java is important to internet?


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Features of Java applications

Sun Micro Systems officially describes Java

with the following features

Compiled and Interpreted

Platform Independent and Portable

Object Oriented

Robust and Secure

Distributed


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Simple, Small and Familiar

Multithreaded and Interactive

High Performance

Dynamic and Extensible

Features of Java applicationsContd..


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Compiled and Interpreted

Usually a computer language is either compiled or

interpreted

Java combines both these approaches, thus making

Java a two stage system

First Java compiler translates source code into

byte code instructions

Byte codes are not machine instructions


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Compiled and Interpreted In the second stage Java interpreter generates

machine code

That can be directly executed by the machine

Contd..

Fig. 2.1 Compiled and Interpreted


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Platform Independent and Portable

The most significant feature of Java is its

portability

Java programs can be easily moved from one

computer system to another ,anywhere and at

anytime


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Changes and upgrades in

Operating systems

Processors

System resources

will not force any changes in Java programs

Platform Independent and Portable Contd..


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Platform Independent and Portable Contd..

Fig. 2.2 Once compiled, Java class file can be run on any platform


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Object Oriented

Java is a true object oriented language

Almost everything in Java is an object

All programs code and data reside within objects

and classes

Java comes with an extensive set of classes

arranged in packages


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Robust and Secure

Java is a robust language

It provides many safeguards to ensure reliable

code

It has strict compile time and runtime for data

types


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It is designed as a garbage collected language

Java also provides concept of exception handling

which identifies errors and eliminates

Robust and SecureContd..


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Security becomes an important issue for a

language that is used for programming on internet

Threat of viruses and abuse of resources

Java systems not only verify all memory access,

but also ensure that no viruses are communicatedwith an applet



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The absence of pointers in Java ensures that

programs cannot gain access to memory location

without proper initialization



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Distributed

Java is designed as a distributed language for

creating applications on networks

It has the ability to share both data and programs


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Java applications can open and access remote

object as easily as they can do in a local system

Enables multiple programmers at multiple

locations work together on a single project

DistributedContd..


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Simple, Small and Familiar

Java is small and simple language. Many features

of C and C++ are not part of Java

eg. : Java does not provide

Pointers Preprocessors header file

goto statements

Operator overloading Multiple inheritance


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Familiarity is another feature of Java

It is modeled on C and C++ languages

Java is a simplified version of C++

Simple, Small and FamiliarContd..


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Multithreaded and Interactive

Multithreaded means handling multiple

tasks simultaneously

Java supports multithreaded programs Need not wait for the application to finish

one task before beginning another

Greatly improves the interactive

performance of graphical applications


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High Performance

Java performance is impressive for an interpreted

language

Due to the use of intermediate byte code

Java architecture is also designed to reduce

overheads during runtime

The incorporation of multithreading enhances theoverall execution speed of Java programs


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Dynamic and Extensible

Java is a dynamic language

Java is capable of dynamically linking new

Class libraries

Methods

Objects

Java programs supports functions written in other

languages such as C and C++ These functions are known as native methods


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This facility enables the programmers to use the

efficient available in these languages

Native methods are dynamically linked at runtime

Dynamic and ExtensibleContd..


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Summary

Features of Java Applications

Features of Java Applets


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Quiz

1.Usually a computer language is either ______

a) Compiledb) Compiled and Interpreted

c) Compiled or Interpreted

d) Interpreted


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Frequently Asked Questions

Explain the features of Java Applications and Java

Applets


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swingsStrutsjdbchibernate

homejava previous question papersOCT/NOV-2012 QUESTION PAPER

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April/ May 2011 c-09April/ May 2011 c-05

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http://raj-swings.blogspot.in/http://raj-struts.blogspot.in/http://rajjdbc.blogspot.in/http://raj-hibernate.blogspot.in/http://improvejava.blogspot.in/2011/04/aprilmay-2011.html%20(c-05)http://improvejava.blogspot.in/2012/11/c-09-octnov-2012.htmlhttp://improvejava.blogspot.in/2012/11/c-09-octnov-2012.htmlhttp://improvejava.blogspot.in/2012/04/aprilmay-2012-c-09.htmlhttp://improvejava.blogspot.in/2011/10/octobernovember-2011.htmlhttp://improvejava.blogspot.in/2013/02/aprilmay-2011.html%20(c-09)http://improvejava.blogspot.in/2011/04/aprilmay-2011.html%20(c-05)http://improvejava.blogspot.in/2011/04/aprilmay-2011.html%20(c-05)http://improvejava.blogspot.in/2011/04/aprilmay-2011.html%20(c-05)http://improvejava.blogspot.in/2011/04/aprilmay-2011.html%20(c-05)http://improvejava.blogspot.in/2013/02/aprilmay-2011.html%20(c-09)http://improvejava.blogspot.in/2013/02/aprilmay-2011.html%20(c-09)http://improvejava.blogspot.in/2013/02/aprilmay-2011.html%20(c-09)http://improvejava.blogspot.in/2011/10/octobernovember-2011.htmlhttp://improvejava.blogspot.in/2011/10/octobernovember-2011.htmlhttp://improvejava.blogspot.in/2011/10/octobernovember-2011.htmlhttp://improvejava.blogspot.in/2011/10/octobernovember-2011.htmlhttp://improvejava.blogspot.in/2011/10/octobernovember-2011.htmlhttp://improvejava.blogspot.in/2012/04/aprilmay-2012-c-09.htmlhttp://improvejava.blogspot.in/2012/11/c-09-octnov-2012.htmlhttp://improvejava.blogspot.in/2012/11/c-09-octnov-2012.htmlhttp://improvejava.blogspot.in/2012/11/c-09-octnov-2012.htmlhttp://improvejava.blogspot.in/2012/11/c-09-octnov-2012.htmlhttp://improvejava.blogspot.in/2012/11/c-09-octnov-2012.htmlhttp://improvejava.blogspot.in/2012/11/c-09-octnov-2012.htmlhttp://improvejava.blogspot.in/2012/11/c-09-octnov-2012.htmlhttp://improvejava.blogspot.in/2011/04/aprilmay-2011.html%20(c-05)http://raj-hibernate.blogspot.in/http://rajjdbc.blogspot.in/http://raj-struts.blogspot.in/http://raj-swings.blogspot.in/

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