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Talon
Talon wrote ...

2014/12/11

Greenfoot Terminal, Don't Understand

Talon Talon

2014/12/11

#
Hey there, I'm new to programming. I have to use greenfoot for class and I decided I would try to learn stuff at home because and and hour and half every other day wasn't cutting it. Ok, so every time i run the game, it works fine. When ever my health reaches 0 and the game is over, I get a terminal window. 
java.lang.NullPointerException
	at Crab.crabHealth(Crab.java:130)
	at Crab.act(Crab.java:44)
	at greenfoot.core.Simulation.actActor(Simulation.java:583)
	at greenfoot.core.Simulation.runOneLoop(Simulation.java:541)
	at greenfoot.core.Simulation.runContent(Simulation.java:215)
	at greenfoot.core.Simulation.run(Simulation.java:205)
java.lang.IndexOutOfBoundsException: Index: 0, Size: 0
	at java.util.ArrayList.rangeCheck(ArrayList.java:635)
	at java.util.ArrayList.get(ArrayList.java:411)
	at Lifebar.act(Lifebar.java:32)
	at greenfoot.core.Simulation.actActor(Simulation.java:583)
	at greenfoot.core.Simulation.runOneLoop(Simulation.java:541)
	at greenfoot.core.Simulation.runContent(Simulation.java:215)
	at greenfoot.core.Simulation.run(Simulation.java:205)
java.lang.IndexOutOfBoundsException: Index: 0, Size: 0
	at java.util.ArrayList.rangeCheck(ArrayList.java:635)
	at java.util.ArrayList.get(ArrayList.java:411)
	at Lifebar.act(Lifebar.java:32)
	at greenfoot.core.Simulation.actActor(Simulation.java:583)
	at greenfoot.core.Simulation.runOneLoop(Simulation.java:541)
	at greenfoot.core.Simulation.runContent(Simulation.java:215)
	at greenfoot.core.Simulation.run(Simulation.java:205)
java.lang.IndexOutOfBoundsException: Index: 0, Size: 0
	at java.util.ArrayList.rangeCheck(ArrayList.java:635)
	at java.util.ArrayList.get(ArrayList.java:411)
	at Lifebar.act(Lifebar.java:32)
	at greenfoot.core.Simulation.actActor(Simulation.java:583)
	at greenfoot.core.Simulation.runOneLoop(Simulation.java:541)
	at greenfoot.core.Simulation.runContent(Simulation.java:215)
	at greenfoot.core.Simulation.run(Simulation.java:205)
java.lang.IndexOutOfBoundsException: Index: 0, Size: 0
	at java.util.ArrayList.rangeCheck(ArrayList.java:635)
	at java.util.ArrayList.get(ArrayList.java:411)
	at Lifebar.act(Lifebar.java:32)
	at greenfoot.core.Simulation.actActor(Simulation.java:583)
	at greenfoot.core.Simulation.runOneLoop(Simulation.java:541)
	at greenfoot.core.Simulation.runContent(Simulation.java:215)
	at greenfoot.core.Simulation.run(Simulation.java:205)
java.lang.IndexOutOfBoundsException: Index: 0, Size: 0
	at java.util.ArrayList.rangeCheck(ArrayList.java:635)
	at java.util.ArrayList.get(ArrayList.java:411)
	at Lifebar.act(Lifebar.java:32)
	at greenfoot.core.Simulation.actActor(Simulation.java:583)
	at greenfoot.core.Simulation.runOneLoop(Simulation.java:541)
	at greenfoot.core.Simulation.runContent(Simulation.java:215)
	at greenfoot.core.Simulation.run(Simulation.java:205)
java.lang.IndexOutOfBoundsException: Index: 0, Size: 0
	at java.util.ArrayList.rangeCheck(ArrayList.java:635)
	at java.util.ArrayList.get(ArrayList.java:411)
	at Lifebar.act(Lifebar.java:32)
	at greenfoot.core.Simulation.actActor(Simulation.java:583)
	at greenfoot.core.Simulation.runOneLoop(Simulation.java:541)
	at greenfoot.core.Simulation.runContent(Simulation.java:215)
	at greenfoot.core.Simulation.run(Simulation.java:205)
java.lang.IndexOutOfBoundsException: Index: 0, Size: 0
	at java.util.ArrayList.rangeCheck(ArrayList.java:635)
	at java.util.ArrayList.get(ArrayList.java:411)
	at Lifebar.act(Lifebar.java:32)
	at greenfoot.core.Simulation.actActor(Simulation.java:583)
	at greenfoot.core.Simulation.runOneLoop(Simulation.java:541)
	at greenfoot.core.Simulation.runContent(Simulation.java:215)
	at greenfoot.core.Simulation.run(Simulation.java:205)
java.lang.IndexOutOfBoundsException: Index: 0, Size: 0
	at java.util.ArrayList.rangeCheck(ArrayList.java:635)
	at java.util.ArrayList.get(ArrayList.java:411)
	at Lifebar.act(Lifebar.java:32)
	at greenfoot.core.Simulation.actActor(Simulation.java:583)
	at greenfoot.core.Simulation.runOneLoop(Simulation.java:541)
	at greenfoot.core.Simulation.runContent(Simulation.java:215)
	at greenfoot.core.Simulation.run(Simulation.java:205)
java.lang.IndexOutOfBoundsException: Index: 0, Size: 0
	at java.util.ArrayList.rangeCheck(ArrayList.java:635)
	at java.util.ArrayList.get(ArrayList.java:411)
	at Lifebar.act(Lifebar.java:32)
	at greenfoot.core.Simulation.actActor(Simulation.java:583)
	at greenfoot.core.Simulation.runOneLoop(Simulation.java:541)
	at greenfoot.core.Simulation.runContent(Simulation.java:215)
	at greenfoot.core.Simulation.run(Simulation.java:205)
if you need me to post my source code I will, just let me know.
erdelf erdelf

2014/12/11

#
I think I know the problem... the lifebar and a crab is trying to find the actor but you removed him (just a guess) if it is so, try to check stuff like this before.. you could simply use the try method 
try 
{ 

      // awesome stuff aka your code
} catch(Exception e)
{ 
     e.printStackTrace();
}
danpost danpost

2014/12/11

#
To be sure, post your Crab class code.
Talon Talon

2014/12/11

#
erdelf wrote...
I think I know the problem... the lifebar and a crab is trying to find the actor but you removed him (just a guess) if it is so, try to check stuff like this before.. you could simply use the try method 
try 
{ 

      // awesome stuff aka your code
} catch(Exception e)
{ 
     e.printStackTrace();
}
Thanks man! I just did some short changes and was able to fix this.
danpost wrote...
To be sure, post your Crab class code.
I got it all figured out, thank you tho. I have been reading the "forums" or whatever you would call this alot this week and I see you help almost everyone's post that I read. Thanks for everything
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