Explain event driven programming

Answer 1

Let's say, I were to go create a button object for the program user to click on...; the button text might say.

[Click here]

...or,...

[Click here to see Help]

...or,...

[Click here to sort list]

-etc.

At first, the button would just simply sit there; and, therefore, the program would take no further action; except to wait for an 'event' to happen.

Whenever the user of my program clicks on that button; then, the button 'click event' will get triggered.

The users click might trigger off some other code to start working...such as, when the button is clicked on do this/or, do that...display a text message/or, sort list/ -etc.

Each seperate object has it's own list of possible events. For example, a button can have the following list of events...

button.Focus()

button.Click()

button.DoubleClick()

-etc.

so, the program waits to see what type of event is happenning, first ...and, when a certain type of event does, eventually, occur...then, this leads to more programming code getting executed.

This is how OOP/Object Oriented Programming languages...programming using objects/objects that are 'event driven' works.

Answer 2

Advantages

- It allows for more interactive programs. Almost all modern GUI programs use event driven programming.

- It can be implemented using hardware interrupts, which will reduce the power used by the computer.

- It allows sensors and other hardware to easily interact with software.

Disadvantages

- For simple programs, event driven programming is often more complex and cumbersome than batch programming.

- The flow of the program is usually less logical and obvious

Answer 3

In an event-driven language, one creates "handlers" that wait for input from the operating system, and when the input is received, the appropriate handler is called. In Windows, the basic function that handles events is known as WndProc. In Java, events are built in to the language, and are distributed by registering event listeners. Other languages use a similar model of event registration. Unlike a console application, which is primarily poll-based, an event-driven application uses fewer CPU cycles, since it doesn't use the CPU when it is idle. The specifics of developing an event-driven program are language dependent, so someone interested in developing such an application should refer to a book, tutorial, or manual on the language of their choice. Common choices include C++, Java, C#, and ActionScript (or other ECMAScript-type languages), but there are many other languages that support event-driven models as well.

Answer 4

fbxcvnb jvgkhjkb is a event driven program

Answer 5

Its used in operating systems, internet browser software basically anywhere really, yes you may not be creating the code but you are reading the code hence it is a use.

Answer 6

I use it so that something will happened depending on an event. For example a left click will have a different affect then a right click.

Answer 7

Ulus