Transmission Media

Transmission Media is a communication medium for creating network.

Twisted Pair Cable: 

It consist of two wire wrapped together in a double helix.

Coaxial Cable :

This type of wire consists of a solid wire  surrounded or cover by wire shields, each separated by some kind of plastic insulator.

Optical Fiber :

This type of wire consist of a thing strands of glass or glass like martial  which are so constructed that they carry light from a source  used as light emitting diodes LED or laser diodes LDs . The data travels through then in the form of light.

getText() & setText()

getText() :-
 This method is used to retrieve (or receive) the text of a component like Text Feild at run time
e.g :   name.getText();
setText:-
This method is used to change the  display text  of a component like label, text field or button  at run time
e.g   nn.setText(""+name);

Types of Operating System

There are three types of Operating Systems.
Single- User.
This type allows one user to operate the computer and run different programs on the computer. Ms-Dos is a good example of single user OS.
Multi- User.
This type allows two or more then two users to run the programs at a time on the single computer system.Unix, Linux, Windows are the good example  of this type of operating system.
Real Time
This type of operating system are used in  Robotics. They respond instantly and used in communications and and various   military equipments . LYNX and Windows CE are the example of the real time operating system,. 

Layout Managers

These managers enable to control the way in which  visual components are arranged in GUI forms by determining the size and position of components within containers .
They are:
FlowLayout.
BorderLayout.
GridLayout.
GridBagLayout.
SpringLayout.
CardLayout.
BoxLayout

difference between break and continue.

Break
The break command terminates the very statement it appears in.

Continue
The continue statement skip the current iteration of loops by skipping over the rest of the statements in the loop body.

Two Categories of Loops

There are two types of loops.
1. Entry Controlled / Top tested/ Pre tested Loops.
In this type of loop the contions is tested first and the execute the set statements.
e.g
whitle(<condition>)
{
.
.
Set of statements
}


2. Exit controlled /  Bottom Tested / Post Tested loops.
In this type of loop the set of statement is executed first then condition is  tested.
e.g.
do
{
.
.
Set of statements
}
while(<Condition>);

In this type of loop the statement will be executed once even if conditon is false.

Container Control

A Container is a control that an hold other controls within it e.g. A Frame . Controls inside a container are known as child controls .The Child controls can exits completely inside their containers . That means we can't move them out  side their container.

If we delete a container control , all the child controls get deleted automatically.

MAC Address

The MAC Address refers to the physical address given by NIC (Network Interface Card) manufacturer. They are like code assigned to manufacturer by IEEE e.g. 10:B5:03:63:2E:FC . The first Six are the Manufacturer ID and Next Six are the card NO. So every MAC Address is different the way human being have different thumb impression .

Touch Screen

Add caption

Touch Screen is a Display Screen that has a touch-sensitive transparent panel covering the screen is known as touch screen. In Touch Screen, A grid of light beams or fine wires criss-cross the compiler screen . When you touch the screen with your finger , The ray are blocked and the computer sense where you have pressed and thereby identifies the object which you want to choose. They are often used as input devices in public places such as ATM, Airport, Travel Agencies.

Netbeans IDE is a free , open source , cross platform IDE (Integrated Development Environment) with built -in support for Java Programming Language. Netbeans offers many features for application development such as

- Drag and drop GUI creation
- Editing Tools
- Web Services.
- Excellent debugging.
- Wizards , Coding and Management tools and many more
Any body can download it from http://java.sun.com/javase/downloads/netbeans.html
but remember load it as netbeans with jdk . So that you don't have any problem in installing and working , and creating your applications