To create a basic Text class out of a simple Actor class, all that needs to be done is to move the method that updates its image into the class.

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import greenfoot.*;

​

public class Text extends Actor
{
    public void updateImage(String text)
    {
        GreenfootImage image = new GreenfootImage(text, 24, null, null);
        setImage(image);
    }
}

BUILDING A TEXT ACTOR CLASS