That is included in some of the comment lines in linked demo.

Please refer to my Value Display Tutorial scenario. The following path is specific to your needs: USING A BASIC ACTOR OBJECT > A BASIC CODING SYSTEM > SAMPLE CODING OF BASIC DISPLAY ACTOR IN ACTOR CLASS The only thing lacking is to put the following line at the end of the act method (adjust last value as needed):

i'm trying to make a health bar using this code but theres an error and i don't know how to fix it public class HealthBar2 extends player2 { private int health = 100; // Say, they start with 100 health public HealthBar2() { } protected void addedToWorld(World myworld) { updateHealthBar2(0); } public int updateHealthBar2(int healthChange) { health = health - healthChange; // Note: you can add health by passing in a negative change if( health <= 0 ) { return 0; // Let's caller know we died } else if( health > 100 ) { health = 100; // can't have more than the max health } // Redraw health bar to match current health GreenfootImage myimage = new healthbar(health, 20); myimage.setColor(Color.RED); myimage.fill(); setImage(myimage); setLocation(getImage().getWidth()/2 + 40, getY()); return health; } }

There are different types of errors, Greenfoot lets you know which error it came upon. It will also give you a link to show which line caused the error. I believe the link is in a red color

The following line looks suspicious: What codes do you have for the healthbar class? (??? does it extend the GreenfootImage class ???)

don't really know what GreenfootImage is its extended to the actor

Well, you cannot assign an actor to a variable that is declared to hold (or refer to) an image. An image (or GreenfootImage) is basically a rectangular array of Color objects. That, my dear sir, is not what an actor is (except visually, through the setting of its image).

GreenfootImage is not an actor, unless your healthbar class extends GreenfootImage, it will not work Try using this: