concurrentmodification

For those who hate reading long questions, take the complete code below, run it, hit SPACE a few times, and you'll get a ConcurrentModificationException . Simple question: How do you fix it? The problem is trying to remove a Fireball from the list when it exits the screen. The Timer code is where the problem lies. If you want more info, keep reading. In this question where the OP asks how to to shoot fireball images, I answered with this answer indicating that a data structure should be used to hold the fireballs. IMO it was a half @$$ answer. The reason I think this is because the code I gave

I'm finding conflicting advice over the best way to avoid a ConcurrentModificationException while doing this: List<Apple> Apples = appleCart.getApples(); for (Apple apple : Apples) { delete(apple); } I'm leaning towards using an Iterator in place of a List and calling its remove method. Does that make the most sense here? Yes, use an Iterator. Then you could use its remove method. for (Iterator<Apple> appleIterator = Apples.iterator(); appleIterator.hasNext();) { Apple apple = appleIterator.next(); if (apple.isTart()) { appleIterator.remove(); } } } If you're getting a

Possible Duplicates: Java: Efficient Equivalent to Removing while Iterating a Collection Removing items from a collection in java while iterating over it I'm trying to loop through HashMap : Map<String, Integer> group0 = new HashMap<String, Integer>(); ... and extract every element in group0 . This is my approach: // iterate through all Members in group 0 that have not been assigned yet for (Map.Entry<String, Integer> entry : group0.entrySet()) { // determine where to assign 'entry' iEntryGroup = hasBeenAccusedByGroup(entry.getKey()); if (iEntryGroup == 1) { assign(entry.getKey(), entry

Is there any way I can modify the HashMap values of a particular key while iterating over it? A sample program is given below: public static void main(String[] args) { HashMap<Integer,ArrayList<String>> hm = new HashMap<Integer, ArrayList<String>>(); ArrayList<String> ar = new ArrayList<String>(); for(int i=0;i<50;i++){ ar.add(Integer.toString(i)); } hm.put(1, ar); for(String s:hm.get(1)){ hm.get(1).add("hello"); } } Error Thrown: Exception in thread "main" java.util.ConcurrentModificationException at java.util.ArrayList$Itr.checkForComodification(Unknown Source) at java.util.ArrayList$Itr

With the snippet below I am, attempting to process a spreadsheet, with the twist of needing to exclude ad hoc columns. I know the crude way I am doing it, put the exceptions in an ArrayList and process the list on each and ever increment over the current row columns is perverse, but you know just get it done. However I am getting the titled error, which I believe should never happen. I am just looping through the ArrayList and comparing, not modifying anything. Where is the error? Is there a better way to handle the exceptions list? ArrayList noProcess = new ArrayList(); Iterator itr00 =

I am getting exception while consuming the messages from kafka. org.springframework.messaging.MessagingException: Consuming from Kafka failed; nested exception is java.util.concurrent.ExecutionException: java.lang.IllegalStateException: Iterator is in failed state I have one consumer in the application context with one outbound adapter. Consumer configuration in application context <int-kafka:consumer-context id="consumerContext" consumer-timeout="4000" zookeeper-connect="zookeeperConnect"> <int-kafka:consumer-configurations> <int-kafka:consumer-configuration group-id="GR1" value-decoder=

private int checkLevel(String bigWord, Collection<String> dict, MinMax minMax) { /*value initialised to losing*/ int value = 0; if (minMax == MinMax.MIN) value = 1; else value = -1; boolean go = true; Iterator<String> iter = dict.iterator(); while(iter.hasNext()) { String str = iter.next(); Collection<Integer> inds = naiveStringSearch(bigWord, str); if(inds.isEmpty()) { iter.remove(); } for (Integer i : inds) { MinMax passin = minMax.MIN; if (minMax == MinMax.MIN) passin = minMax.MAX; int value2 = checkLevel(removeWord(bigWord, str, i), dict, passin); if (value2 == -1 && minMax == minMax.MIN)