var a="hello";
var b="world";

var concat= $a+$b;

When you use the existting class in new class means when u 
inherit the base class in drive class is called 
inheritance..
new class is called driveclass & existing class called base 
class

Creating a new class from an another class...The new class 
is called  DERIVED class and The parent Class is called 
BASE class...

core java is nothing but language and its a part j2se 
edition declared by sun Microsystems inthis we learn about 
the casses & object orientation module for further advanced 
purpose of advance java programming.(j2ee)
Advaced java is the J2ee edition given by sun MicroSystems
in this we learn technology we learn about Servlets,jsps
i.e.; Client server Architecture etc.; about webcomponents 
presentation tier architecture.

Core java represents the java standard edition, It will 
define all the aspects of oop like 
polymorphism,inheritance,classes and all.The programs need 
JVM to compile..
Advanced java is J2EE specification, this specification 
only used for developing secure,scalable web 
applications.It has certain objects like 
session,request,servlet which are defined in the web 
container .request is sent to web container and processed 
finally response is sent back to the user..

Create a button and call the java script function on any 
event of created button.

In the java script function you can write statement to 
submit the form. eg.

document.FormName.submit().

Client side scripting is that which runs on user browser.
client side scripting is used for validation.
javascript, VB script are client side scripting.

server side scripting is that which runs on server.Used to
insert and fetch record from database
PHP,ASP are server side scripting.

notepad or any editor, Browser,
Javascript must be enabled in browser