Discussions

The same can be said for the Good component field. That is, the line: <Code Omitted>would need to read <Code Omitted>for the field to obtain a value and for the getGood method to return that object (and not null).

I filed a ticket for this in our bug database, thanks.

You start with a World object and some Actor objects. What have you tried? (your question does not conform to site standards -- not specific enough and no code given).

I tried now different solutions and I think I solved my problem now. Thank you for helping.

You can use a "getter" and a "setter" method in the class where the array is located. Like the following (presuming the array holds int values): <Code Omitted>Then in Class_B. you could use something like: <Code Omitted>

Good question. The required HTML-Files come with the download. However, the program doesn't seem to find it. In the title it says "null" and you get an error when trying to open it in a browser telling you that the requested file can't be found. Unfortunately, I didn't find a way to make them appear by clicking on Actor/World. Seems to be a bug in 3.5.0. You can also find the Greenfoot API here: https://www.greenfoot.org/files/javadoc/

<Code Omitted>

It depends on the condition. Examples: <Code Omitted><Code Omitted><Code Omitted><Code Omitted>

You could define a new variable which counts how long you press a button by adding +1 every act-step the button is pressed. Like so: <Code Omitted>

One major problem is that max is a new variable every act cycle and is always initially set to 5. Another issue with the current code is that as long as the number of Enemy object in the world is less than max, max will increase and always stay greater than the number of Enemy objects in the world. You can either add two Enemy object into the world at the same time or introduce a target field. However, maybe the best way is to override the removeObject method:

All possible values for the counter are exhaustd by line 8 -- that is, the 3rd if block will never by executed. You can just remove the "else" from line 13, however, that code, as is, is a bit much. Try the following: <Code Omitted>Or, even shorter: <Code Omitted>

thank you that helped a ton

Oops, never mind. I found it after all. If you are encountering this, the solution is at: https://www.greenfoot.org/doc/faq#macos-keys

In order for an object to not pass through an object of any kind you, it needs to receive the equal to opposite amount of force. This would be placed in the same area that the movement code is for each direction possible (or you can use a boolean to switch the values to add a bounce affect if it's an AI/Enemy).

Remove the word "boolean" from line 7. You are inadvertently creating a new variable there (which is NOT that declared on line 1). By removing the type on line 7, it will then refer to the one declared on line 1. Replace line 13 with the following: <Code Omitted>No NullPointerException error can then be caught here.