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KeyboardAndFocusDemo - This applet demonstrates Focus...

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/* This applet demonstrates Focus events and Key events. A colored square is drawn on the applet. By pressing the arrow keys, the user can move the square up, down, left, or right. By pressing the keys R, G, B, or K, the user can change the color of the square to red, green, blue, or black, respectively. Of course, none of the keys will have any effect if the applet does not have the keyboard input focus. The applet changes appearance when it has the input focus. A cyan-colored border is drawn around it. When it doesn not have the input focus, the message "Click to activate" is displayed and the border is gray. */ * import java.awt.*; import java.awt.event.*; import java.applet.Applet; i public class KeyboardAndFocusDemo extends Applet implements KeyListener, FocusListener, MouseListener { // (Note: MouseListener is implemented only so that // the applet can request the input focus when // the user clicks on it.) static final int SQUARE_SIZE = 40; // Length of a side of the square.
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