Explain History and Features of Java (or ) Why we use Java on the Web?
https://www.computersprofessor.com/2016/06/explain-history-and-features-of-java-or.html
Java is a
product of “sun micro systems” Java is
first released with
name “oak” in 1990’s. Java has altered and
released in number of ways. Present a new
set of interfaces , classes
called swing , packages, java beens, EJB,
structs and more have
been added. ‘sun’ continuous to attract developers with millions
downloading free software
development kits.
Advantages of Java:-
Object
orientation.
Platform independent.
Excellent network
capabilities.
No pointers.
lot
of books available in web .
Implementation are available free of charge
for many popular
platforms.
Interpretation:- Programs written in plane text
(source code)s source code
is read by interpreter and executed some interrupter convert the
source code into an intermediate code called ‘byte code’ and then execute the
byte code.
The great advantages of using byte
code is that program can be executed fast then the plain text.
Why we use Java on the web:- Java has the better support for
networking than any other programming language.
Java
networking is totally based around the internet suit of protocols. Technologies
such as ‘object request brokers’ (ORB) can be used to connect entire corporate
networks together including older system.
Java
applications can run on servers and client work stations. The common reason for
getting into java is probably to develop java applets. These are small programs
which can be embedded into webpages and executed automatically.
When
the page is loaded by a browser applets extend the functionality of the browser
in a variety of ways.
Java
performance is great using java script and JSP we can manipulate the elements
of HTML page. Java support mobile phones
(or) web TV sets.
Example program for creating a simple Applet program.
import java.io.*;
import java.lang.*;
import java.out.*;
import java.applet.Applet;
class SimpleAwt extends Applet
{
TextArea ta;
public
void init( )
{
ta
= new TextArea (2, 30);
ta. appendText (“Hello world”);
add
(la);
validate
( );
}
}
Applet
does not need a ‘main( )’ method. Instead applet have a method called “init(
)”. This is called by the browser each time you want to start the applet.
<head>
<title> A simple applet </title>
</head>
<body>
<p> There is a simple awt applet </p>
<object code = “SimpleAwt.class” width = “100” height = “100”/>
</body>
</html>
