Giving up control - Event-driven programming.
The GUI programming style is referred to as
event-driven programming. In this style of programming
you set up the graphical user interface and initialize things.
It appears that the program just stops and sits there doing nothing!
There is no input loop; your program isn't trying to read from the user.
You, the programmer, have to learn to give up control in two ways.
Your program gives control to the GUI system, and you only get control
back to when your listeners are called.
At an even higher level, your program has given control to the user.
It's the user who selects which of your methods to call by their choice
of buttons to click on, menu items to select, etc.
Listeners.
When the user clicks a button
(or uses another GUI component), an event is sent to listener method.
Your job as a programmer is to write a listener method for each
component.
It's the user, not the programmer, who has control, indirectly choosing methods in your program to execute
by interacting with graphical user interface components.
tech vedic on 22 May 13Here's one of those sad facts of life that you just can't avoid: Like cars, clothing, and people, batteries wear out. You can't stop this process, but with proper care you can slow it down. What wears down a battery? Charging and discharging. Obviously, you can't avoid either of those acts entirely (although if you could, you wouldn't have to worry about wearing out your battery). The trick, of course, is to do as little charging and discharging as possible. And one way to avoid charging and discharging is to remove the battery when you don't need it. Ideally, you would remove the battery (with the laptop shut down, of course) before plugging in the AC adapter and working at your desk. Then, before you take your PC on the road, you would shut it down, insert the battery, and let it charge for a few hours. In reality, that's not always practical. Shutting down and rebooting your PC every time you go from portable to deskbound quickly becomes a nuisance. Worse, you have to remember to recharge before leaving home. A more practical solution would be to shut down the laptop and remove the battery when you expect it will stay plugged in for a week or more. And don't intentionally discharge the battery before removing it. After all, the whole point is to charge and recharge as little as possible. Some of the charge will be lost while the battery sits unused, so it's still a good idea to recharge it before taking it on the road--even though that requires some planning ahead of time. By-The Xpert Crew @ http://techvedic.com https://www.facebook.com/photo.php?fbid=140300136155835&set=o.172245722918618&type=1&theater
