Gold Income

import greenfoot.*;
public class MyWorld extends World
{
    // fields usually (by convention) go first
    private int Yen;
    private int YenTimer;
    private Actor YenDisplay = new Yen();
    // class constructors usually (by convention) go next
    public MyWorld()
    {
        super(1400, 675, 1);
        adjustYen(0); // to initialize image
        addObject(YenDisplay, 100, 30); // wherever
    }     
    // methods (by convention) go last
    public int getAccumulatedYen()
    {
        return Yen;
    }
    public void adjustYen(int adjustment)
    {
        Yen += adjustment;
        YenDisplay.setImage(new GreenfootImage("Yen: "+Yen, 30, Color.BLACK, Color.WHITE));
    }
    public void act()
    {
    accumulateYen();
    }
    private void accumulateYen()
    {
    YenTimer = (YenTimer+1)%60;
    if (YenTimer == 0) adjustYen(1);
    }
        private void prepare()
    {
        addObject(new Umaru(), 700, 338);
        addObject(new Taihei(), 1356,108);
    }
}

import greenfoot.*;
public class Umaru extends Actor
{
    public void act() 
    {
        GainYen();
    }
    private boolean once = false;
    public boolean repeatBuff = false; // you can set this to true and it will start repeating
    private int YenPerMin = 90;
    private int YenPerAct = 1;
    public void GainYen() 
    {
        float YenAdjustment = 0; // every cycle this value will pe deposited onto the world's yen value
        if(Greenfoot.isKeyDown("space") && (!once || repeatBuff)) 
        {
             YenAdjustment += YenPerAct;
             once = true;
        }
        else if(!Greenfoot.isKeyDown("space") && once)
        {
             once = false;
        }
        Greenfoot.setSpeed(50);
        YenAdjustment += YenPerMin / 60f / 50;
        MyWorld mw = (MyWorld)getWorld();
        mw.adjustYen(YenAdjustment);
        // When buying something, only subtract the price from AGold!
    }
}

import greenfoot.*;
public class MyWorld extends World
{
    // fields usually (by convention) go first
    public float AYen; //precise
    public int DYen; //rounded
    public Yen YenDisplay = new Yen();
    // class constructors usually (by convention) go next
    public MyWorld()
    {
        super(1400, 675, 1);
        adjustYen(0); // to initialize image
        prepare();
        addObject(YenDisplay, 100, 30); // wherever
    }     
    // methods (by convention) go last
    public int getAccumulatedYen()
    {
        return DYen;
    }
    public void adjustYen(float adjustment)
    {
        AYen += adjustment;
        DYen = (int) AYen;
        YenDisplay.setImage(new GreenfootImage("Yen: "+DYen, 30, Color.BLACK, Color.WHITE));
    }
    private void prepare()
    {
        addObject(new Umaru(), 700, 338);
        addObject(new Taihei(), 1356,108);
    }
}