counter

import greenfoot.*;
import java.awt.Color;

public class Counter extends Actor
{
    private static final Color TRANSPARENT = new Color(0, 0, 0, 0);
    private int value;
    private Color textColor = Color.cyan;

    public Counter()
    {
        updateImage();
    }

    // to create an updated image for the counter object
    private void updateImage()
    {
        int fontSize = 24; // adjust to suit
        setImage(new GreenfootImage(""+value, fontSize, textColor, TRANSPARENT));
    }

    // to change the color of the text
    public void setTextColor(Color color)
    {
        textColor = color;
        updateImage();
    }

    // to add (or subtract) an amount from its value
    public void add(int amount)
    {
        value += amount;
        updateImage();
    }

    // to set a new value for the counter
    public void setValue(int newVal)
    {
        value = newVal;
        updateImage();
    }

    // to allow access to the value from other classes
    public int getValue()
    {
        return value;
    }
}

// add the instance field
String prefix = "";

// add the secondary constructor
public Counter(String text)
{
    prefix = text;
    updateImage();
}

// change line 19 above to
setImage(new GreenfootImage(prefix+": "+value, fontSize, textColor, TRANSPARENT));

// possibly add this method
public void setPrefix(String text)
{
    prefix = text;
    updateImage();
}