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What you need to do is pretty well spelled out in the description. Just look over the class APIs for java.util.Random, java.util.ArrayList and the interface java.util.List to determine what other methods (not specified above) you might need. Also, note what constructors are available for the classes. Java APIs

The first two ways should not be causing that error (maybe in something else you are doing, however). And any of the above ways will not add time between the adding of the new actor. You will need an int spawnTimer to control the duration of time waited to spawn the new actor.

Thanks for the help. Gonna go ahead and try it out.

Thanks! You've been a great help.

I just re-arranged the code, and I found solution, but involves not using the 'null'.

You need to show some effort. Post some attempted code. You may want to browse the Java tutorials, especially the first two sections on Learning the Java Language.

I posted a reply to this in my Progress bar/Health bar scenario comments.

Add an instance integer field to be a life counter in the world class. Initialize its value to 2. In the world act method (or a method it calls), check to see if Crab is in the world, if not, decrement the life counter and then check its value; if the value is not zero, add the crab back into the world; otherwise start a new instance of the world. You may prefer to add the same Crab object back into the world after the first life is gone because the field holding the number of worms eaten will be zero if you add a NEW Crab object into the world. To accomplish this, add an instance Crab fi

You need to track the state of the control key by adding an instance boolean field (I will call it controlDown). <Code Omitted>

Ok, I see what you are saying. Makes sense. Again, thank you for your patience and sharing your knowledge with me.

tylers solution will work if you want to internally keep track of how many balloons have been popped. If you want to visibly display a running counter showing how many have been popped, you will need to create or import a Counter class, link it to the class that detects balloon popping and control it from there. NOTE: if only one counter object is going to be in your world, linking is not mandatory. The Counter class should be able to create and update the image (as the count changes) and have public method(s) to adjust the count value and to return the current value.

Please supply the code for you FriendlyCat class at this point.

aaahhh okay thank you! I appreciate the help!!!