import java.awt.*;
import java.util.*;

public class KeyCounter extends Frame {

private static int NUMBER_OF_UNICODE_CODES = 65536;
private static int ONE_SECOND  = 1000;			// 1 s = 1000 millis

private static int FIRST_ASCII = 0;
private static int  LAST_ASCII = 127;

private static int ASCII_SPACE = 32;
private static int ASCII_DEL   = 127;

// array to accumulate stats in
protected int keys[] = new int[NUMBER_OF_UNICODE_CODES];

protected int total = 0;						// total keys pressed
protected Date then = new Date();				// take a timestamp at init

//-------------------------------------------------------------------
// main() entry point
//-------------------------------------------------------------------
public static void main (String[] args) {
	new KeyCounter();
}
//-------------------------------------------------------------------
// KeyCounter Constructor
//-------------------------------------------------------------------
public KeyCounter() {

	super("KeyCounter demo: please type characters");

	TextArea ta = new TextArea();
	ta.setText("Start typing.. 20 seconds to go..");
	add(ta);

	new KeyCounterAdapter(this, ta);

	setSize(new Dimension(400,300));
	setVisible(true);
}
//-------------------------------------------------------------------
// The original key event processing method.
// This method is now "adapted" to the 1.1 event mechanism via an
// adapter object which acts on behalf of the KeyCounter object.
//-------------------------------------------------------------------
public void hereAnotherKey( char key ) {

	keys[ (int)key ]++;
	total++;

	// record key presses for 20 seconds...
	if ( new Date().getTime() - then.getTime() > 20*ONE_SECOND ) {
		// then..
		dumpKeyStatistics();
		System.exit(0);
	}
}
//-------------------------------------------------------------------
// Dump frequency of all ASCII chars which were typed
//-------------------------------------------------------------------
private void dumpKeyStatistics() {

	for (int keyCode=FIRST_ASCII; keyCode <= LAST_ASCII; keyCode++) {

		if ( keys[keyCode] != 0 ) {
			char glyph;

			if ( keyCode < ASCII_SPACE || keyCode == ASCII_DEL ) {
				glyph = '.';
			} else {
				glyph = (char) keyCode;
			}

			System.out.println("Key '"+ glyph +"' (code "+ keyCode +
								") pressed "+ keys[keyCode] +" times." );
		} // endif
	} // endfor
}
} // End of Class KeyCounter