This is a simple java program for buzzer quizzes

Audio.java

package com.company;
import java.io.*;
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
import javax.sound.sampled.*;
import javax.sound.sampled.spi.*;
class Audio
// Download the audio file at : https://icedrive.net/0/f795m469Cd
{
    public static void red()
    {
        try {
            AudioInputStream audioInputStream = AudioSystem.getAudioInputStream(new File("sound.wav").getAbsoluteFile());
            Clip clip = AudioSystem.getClip();
            clip.open(audioInputStream);
            clip.start();
        } catch(Exception ex)
        {
            System.out.println("Error with playing sound.");
            System.out.println(ex);
        }
    }


    public static void green()
    {
        try {
            AudioInputStream audioInputStream = AudioSystem.getAudioInputStream(new File("sound.wav").getAbsoluteFile());
            Clip clip = AudioSystem.getClip();
            clip.open(audioInputStream);
            clip.start();
        } catch(Exception ex)
        {
            System.out.println("Error with playing sound.");
            System.out.println(ex);
        }
    }
    public static void blue()
    {
        try {
            AudioInputStream audioInputStream = AudioSystem.getAudioInputStream(new File("sound.wav").getAbsoluteFile());
            Clip clip = AudioSystem.getClip();
            clip.open(audioInputStream);
            clip.start();
        } catch(Exception ex)
        {
            System.out.println("Error with playing sound.");
            System.out.println(ex);
        }
    }
    public static void yellow()
    {
        try {
            AudioInputStream audioInputStream = AudioSystem.getAudioInputStream(new File("sound.wav").getAbsoluteFile());
            Clip clip = AudioSystem.getClip();
            clip.open(audioInputStream);
            clip.start();
        } catch(Exception ex)
        {
            System.out.println("Error with playing sound.");
            System.out.println(ex);
        }
    }

}

Buzzer.java

package com.company;

import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
class Buzzer extends JFrame implements KeyListener
{
    JLabel label;

    boolean canPress;
    public Buzzer()
    {
        setVisible(true);
        //frame.setResizable(true);
        setDefaultCloseOperation(EXIT_ON_CLOSE);
        setExtendedState(getExtendedState() | JFrame.MAXIMIZED_BOTH);
        setLayout(null);

        Font f=new Font("ARIEL",Font.BOLD,250);

        label=new JLabel("..........");
        label.setBounds(100,100,1200,500);
        label.setFont(f);
        canPress=true;
        add(label);
        addKeyListener(this);
        //frame.addKeyListener(this);
    }

    public void keyPressed(KeyEvent e)
    {

        char c=e.getKeyChar();
        if(c>='0' && c<='7')
        {
            if(canPress)
            {
                if(c=='0')
                {
                    label.setText("Red");
                    Audio.red();
                }
                else if(c=='1')
                {
                    label.setText("Green");
                    Audio.green();
                }
                else if(c=='2')
                {
                    label.setText("Blue");
                    Audio.blue();
                }
                else if(c=='3')
                {
                    label.setText("Yellow");
                    Audio.yellow();
                }


                canPress=false;
            }
        }
        else
        {
            label.setText("..........");
            canPress=true;
        }
    }

    public void keyTyped(KeyEvent e)
    {
    }

    public void keyReleased(KeyEvent e)
    {
    }

    public static void main(String args[])throws Exception
    {
        Buzzer ob=new Buzzer();
    }
}