concurrentmodification

问题 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

问题 Why does the following occur? Shouldn't both work? List<String> items = data; for( String id : items ) { List<String> otherItems = otherData; // 1. addAll() //Causes ConcurrentModificationException items.addAll(otherItems); // 2. .add() //Doesn't cause exceptions for( String otherId : otherItems ) { items.add(otherId); } } Is it because add() adds to the collection Items, but addAll() creates a new collection thus modifying Items to be a different instance of List? Edit items and otherItems

问题 I have the following code: private Multimap<Object, ComplexCalcStrategy> strategies = HashMultimap.create(); .... Collection<ComplexCalcStrategy> strategiesThatNeedUpdating = strategies.get(mktDataChange.getOptionId()); for (ComplexCalcStrategy strategy : strategiesThatNeedUpdating) { //row number 88 updateMarketData(strategy.getStrategy(), mktDataChange); } and in logs I see following trace: java.util.ConcurrentModificationException at java.util.HashMap$HashIterator.nextEntry(HashMap.java

问题 java.util.ConcurrentModificationException at java.util.AbstractList$Itr.checkForComodification(AbstractList.java:372) at java.util.AbstractList$Itr.next(AbstractList.java:343) at com.alpha.beta.purchasing.item.VendorItemList.loadItems(VendorItemList.java:51) at com.alpha.beta.purchasing.Shipment.loadItems(Shipment.java:1006) at com.alpha.beta.purchasing.Shipment.loadItems(Shipment.java:953) at com.alpha.beta.purchasing.Shipment.getItemTotal(Shipment.java:1503) at com.alpha.beta.purchasing

问题 This question already has answers here : Why is a ConcurrentModificationException thrown and how to debug it (7 answers) Closed 10 months ago . I was reading about ConcurrentModificationException and how to avoid it. Found an article. The first listing in that article had code similar to the following, which would apparently cause the exception: List<String> myList = new ArrayList<String>(); myList.add("January"); myList.add("February"); myList.add("March"); Iterator<String> it = myList

问题 In a HashMap map = new HashMap<String,String>(); it = map.entrySet().iterator(); while (it.hasNext()) { entry = it.next(); it.remove(); //safely remove a entry entry.setValue("new value"); //safely update current value //how to put new entry set inside this map //map.put(s1,s2); it throws a concurrent access exception } When i trying to add a new entry to map it throws ConcurrentModificationException . For remove and update iterator has safely removing methods. How to add new entry while

问题 For a project in my Data Structures class I have been tasked with creating a 3-Dimensional Range Tree where each dimension is a BST. I read this question, but it's an Android question, and the causes of our issues seem different, and the only answer was not accepted. Wall of code coming shortly. Sorry. Classes Involved: Point3D<T> : Generic class containing the coordinates for the point. T extends Comparable<T> , and Point3D extends it as well RangeTree<T> : Generic class containing the root

问题 This question already has answers here : Iterating through a Collection, avoiding ConcurrentModificationException when removing objects in a loop (24 answers) Why is a ConcurrentModificationException thrown and how to debug it (7 answers) Closed 10 months ago . I don't understand why I get a ConcurrentModificationException when I iterate through this multimap . I read the following entry, but I am not sure if I understood the whole thing. I tried to add a synchronized block. But my doubt is

问题 This question already has answers here : Iterating through a Collection, avoiding ConcurrentModificationException when removing objects in a loop (24 answers) Why is a ConcurrentModificationException thrown and how to debug it (7 answers) Closed 10 months ago . I don't understand why I get a ConcurrentModificationException when I iterate through this multimap . I read the following entry, but I am not sure if I understood the whole thing. I tried to add a synchronized block. But my doubt is

问题 This question already has answers here : Why is a ConcurrentModificationException thrown and how to debug it (7 answers) Closed 10 months ago . I have this code below, and I'm getting a ConcurrentModificationException by executing the following line: filterCardsToDevice(getCollection()); the code: private List<MyClass> filterCardsToDevice(Collection<MyClass> col) { final List<MyClass> newList = new ArrayList<MyClass>(); for (MyClass myObj : col) { long id = myObj.getId(); if (id < 0 || id >