Voting (Java)

gistfile1.txt

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package Voting;

import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;

/**
 *
 * @author Petr
 */


public class Voting extends JFrame {

    JPanel buttonPanel;
    VotingPanel votingPanel;

    public Voting() {
        this.setSize(500, 500);
        this.setTitle("Voting");
        votingPanel = new VotingPanel();
        createButtonPanel();
        this.getContentPane().add(buttonPanel, BorderLayout.SOUTH);
        this.getContentPane().add(votingPanel, BorderLayout.CENTER);
        this.setResizable(false);
        this.setDefaultCloseOperation(EXIT_ON_CLOSE);

    }

    void createButtonPanel() {
        buttonPanel = new JPanel();
        buttonPanel.setBackground(Color.BLACK);
        JButton b1 = new JButton("Holeček");
        b1.setBounds(20, 20, 50, 50);
        JButton b2 = new JButton("Hošek");
        b1.addActionListener(new B1Listener());
        b2.addActionListener(new B2Listener());
        buttonPanel.add(b1);
        buttonPanel.add(b2);
    }

    class B1Listener implements ActionListener {

        public void actionPerformed(ActionEvent e) {
            votingPanel.addFirstVote();
        }
    }

    class B2Listener implements ActionListener {

        public void actionPerformed(ActionEvent e) {
            votingPanel.addSecondVote();
        }
    }

    public static void main(String[] args) {
        Voting v = new Voting();
        v.setVisible(true);
    }
}

class VotingPanel extends JPanel {

    JLabel firstLabel;
    JLabel secondLabel;
    static int firstVoteCount = 0;
    static int secondVoteCount = 0;
    final int voteRectangleWidth = 100;
    final int firstRectXPosition = 100;
    final int firstRectYPosition = 400;
    final int secondRectXPosition = 300;
    final int secondRectYPosition = 400;

    public VotingPanel() {
        this.setBackground(Color.LIGHT_GRAY);
        this.setLayout(null);
        firstLabel = new JLabel("Holeček");
        firstLabel.setBounds(125, 400, 100, 50);
        this.add(firstLabel);
        secondLabel = new JLabel("Hošek");
        secondLabel.setBounds(335, 400, 100, 50);
        this.add(secondLabel);


    }

    @Override
    public void paint(Graphics g) {
        Graphics2D g2 = (Graphics2D) g;
        super.paint(g2);
        if (firstVoteCount != 0) {
            g2.setColor(Color.BLACK);
            g2.fillRect(firstRectXPosition - 5, firstRectYPosition - 10 * firstVoteCount - 5, voteRectangleWidth + 10, 10 * firstVoteCount + 10);
            g2.setColor(Color.GREEN);
            g2.fillRect(firstRectXPosition, firstRectYPosition - 10 * firstVoteCount, voteRectangleWidth, 10 * firstVoteCount);
        }
        if (secondVoteCount != 0) {
            g2.setColor(Color.BLACK);
            g2.fillRect(secondRectXPosition - 5, secondRectYPosition - 10 * secondVoteCount - 5, voteRectangleWidth + 10, 10 * secondVoteCount + 10);
            g2.setColor(Color.RED);
            g2.fillRect(secondRectXPosition, secondRectYPosition - 10 * secondVoteCount, voteRectangleWidth, 10 * secondVoteCount);
        }
    }

    void addFirstVote() {
        this.firstVoteCount++;
        repaint();
    }

    void addSecondVote() {
        this.secondVoteCount++;
        repaint();
    }
}