Getting started with Java Applet
YY435
Pacific Network Academy
Fourth day
Keyboard event example
This example requires you to use the mouse to click in the Javaapplet area, then click on the keyboard, you can press what key to each time you can display it on the screen, no lie to you, try it!
The source code of this example is as follows:
Import java.awt.event;
Import java.awt.graphics;
Import java.applet. *;
Public Class Keystrike Extends Applet
{
Char presskey = 0;
INT OUTX = 5, OUTY = 15; // Defines the initial output position
Public Boolean KeyDown (Event E, INT Key) // Keyboard Processing Method
{
Switch (key) / / Determine the key value pressed
{
Case Event.up: OUTY -; BREAK; // If the up button is pressed ...
Case Event.down: OUTY ; Break; // If you press the down button ...
Case Event.Left: Outx -; Break; // If you press the left button ...
Case Event.right: Outx ; Break; // If you press the right button ...
Case Event.home: OUTX = 5; OUTY = 15; Break; // If you press, it is to the home button.
Case Event.end: Outx = 5; OUTY = Size (). Height -15; Break;
/ If the END button is pressed ......
Case Event.pgup: OUTY- = 5; Break; // If the PageUp button is pressed ......
Case Event.pgdn: OUTY = 15; Break; // If you press the Page Down button
Default: presskey = (char) key; breaf; // If the button is not pressed ......
}
Repaint ();
Return True;
}
Public void Paint (Graphics G)
{
IF (PressKey! = 0)
g.drawstring ("You press:" PressKey "Key", OUTX, OUTY
// Display button information!
}
}
