Computer Science 120
Introduction to Programming

Spring 2012, Siena College

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ClickCounter Demo

A working demo of ClickCounter will appear below. Click inside the applet to interact with it.

ClickCounter BlueJ Project

Click here to download a BlueJ project for ClickCounter.

ClickCounter Source Code

The Java source code for ClickCounter is below. Click on a file name to download it.

ClickCounter.java

import objectdraw.*;
import java.awt.*;

/*
 * Example ClickCounter
 * Program that displays how many times the mouse has been clicked.
 *
 * Jim Teresco, Siena College, CSIS 120, Spring 2011
 * Based on example from Williams College, CSCI 134
 *
 * $Id: ClickCounter.java 1501 2011-01-24 20:48:50Z terescoj $
 */

public class ClickCounter extends WindowController {

    // Location of the display
    private static final int DISPLAY_X = 150;
    private static final int DISPLAY_Y = 200;

    // the Text object which displays the count
    private Text display;

    // the number of clicks
    private int count;

    // initialize the counter and the text message
    public void begin() {
        count = 0;
        display = new Text("Click count = 0", DISPLAY_X, DISPLAY_Y, canvas);
    }

    // increment the counter and update the text
    public void onMouseClick(Location point) {
        count = count + 1;
        display.setText("Click count = " + count);
    }
}