Computer Science 523
Advanced Programming

Summer 2014, The College of Saint Rose

Home     Syllabus     Schedule     Examples     Style Guide

Voting Demo

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

Voting BlueJ Project

Click here to download a BlueJ project for Voting.

Voting Source Code

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

Voting.java

/*
 * Example Voting: demonstration of multiple buttons and a slightly more
 * interesting layout
 *
 * Jim Teresco, The College of Saint Rose, CSC 523, Summer 2014
 *
 * $Id: Voting.java 2381 2014-06-18 12:48:37Z terescoj $
 */

import java.awt.BorderLayout;
import java.awt.Container;
import java.awt.Font;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.JApplet;
import javax.swing.JButton;
import javax.swing.JLabel;
import javax.swing.JPanel;

public class Voting extends JApplet implements ActionListener {

    // We need to remember 2 buttons, 2 ints, and 2 labels to cast and track votes
    private JButton aButton, bButton;
    private int aVotes, bVotes;
    private JLabel aLabel, bLabel;

    public void init() {
        Container contentPane = getContentPane();

        aVotes = 0;
        bVotes = 0;

        // set up our labels in a JPanel in the center, use the
        // current font but make it bigger
        JPanel labelPanel = new JPanel();

        aLabel = new JLabel("A: 0");
        bLabel = new JLabel("B: 0");
        Font currentFont = aLabel.getFont();
        Font newFont = new Font(currentFont.getFontName(), currentFont.getStyle(), 30);
        aLabel.setFont(newFont);
        bLabel.setFont(newFont);

        labelPanel.add(aLabel);
        labelPanel.add(bLabel);

        contentPane.add(labelPanel, BorderLayout.CENTER);

        // and some buttons in a JPanel too, set them up with our action listener
        JPanel buttonPanel = new JPanel();

        aButton = new JButton("Vote for A");
        bButton = new JButton("Vote for B");

        aButton.addActionListener(this);
        bButton.addActionListener(this);

        buttonPanel.add(aButton);
        buttonPanel.add(bButton);

        contentPane.add(buttonPanel, BorderLayout.SOUTH);

    }

    // our actionPerformed method now needs to deal with both
    // buttons
    public void actionPerformed(ActionEvent e) {

        // we need to know which button was pressed -- the ActionEvent
        // can tell us with its getSource method
        if (e.getSource() == aButton) {
            aVotes++;
            aLabel.setText("A: " + aVotes);
        }
        else {
            bVotes++;
            bLabel.setText("B: " + bVotes);
        }
    }
}