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I found a fix. What i did is i made 2 more array list for the dead aliens and bullets to store the index into. Afther the loops have ended i made 2 extra loops to delete the aliens and bullets.
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Thanks XD
I hadnt thought of that yet thank you

When a bullit bullit hits a alien it creates this error :

java.lang.IndexOutOfBoundsException: Index: 0, Size: 0
at java.util.ArrayList.rangeCheck(Unknown Source)
at...