import greenfoot.*;  // (World, Actor, GreenfootImage, Greenfoot and MouseInfo)

/**
 * Write a description of class Start here.
 * 
 * @author (your name) 
 * @version (a version number or a date)
 */
public class Start extends Actor
{
    private GreenfootSound mySound = new GreenfootSound("Twice - I CAN'T STOP ME.mp3");
    private int volumeA = 50;
    
    public Start()
    {

    }

    public Start(GreenfootSound mySound, int volumeA)
    {
        this.mySound = mySound;
        this.volumeA = volumeA;
    }

    public GreenfootSound getMySound()
    {
        return mySound;
    }

    public int getVolumeA()
    {
        return volumeA;
    }

    public void setMySound(GreenfootSound mySound)
    {
        this.mySound = mySound;
    }

    public void setVolumeA(int volumeA)
    {
        this.volumeA = volumeA;
    }

    /**
     * Act - do whatever the Start wants to do. This method is called whenever
     * the 'Act' or 'Run' button gets pressed in the environment.
     */
    public void act() 
    {
        startButton();
        curVolume();
    }

    public void startButton()
    {
        if(Greenfoot.mouseClicked(this))
        {
            if(!(mySound.isPlaying()))
            {
                mySound.play();
                setImage("stop.png");
            }
            else
            {
                mySound.pause();
                setImage("start.png");
            }
        }
    }

    public void curVolume()
    {
        mySound.setVolume(volumeA);
    }

    public void volUp()
    {

        if(volumeA < 100)
        {
            volumeA = volumeA + 5;
            curVolume();
        }

    }
    public void volDown()
    {
        if(volumeA > 0)
        {
            volumeA = volumeA - 5;
            mySound.setVolume(volumeA);
        }
    }
}

import greenfoot.*;  // (World, Actor, GreenfootImage, Greenfoot and MouseInfo)

/**
 * Write a description of class VolumeUp here.
 * 
 * @author (your name) 
 * @version (a version number or a date)
 */
public class VolumeUp extends Start
{
    
    
    public VolumeUp()
    {
        
    }
    
    
    /**
     * Act - do whatever the VolumeUp wants to do. This method is called whenever
     * the 'Act' or 'Run' button gets pressed in the environment.
     */
    public void act() 
    {
        up();
        
    }    
    
    public void up()
    {
        if(Greenfoot.mouseClicked(this))
        {
            Start start = new Start();
            start.volUp();
            
        }
    }
}