java – 使用iterator和iterator.remove()时的ConcurrentModific
发布时间:2020-12-15 04:59:29 所属栏目:Java 来源:网络整理
导读:private int checkLevel(String bigWord,CollectionString dict,MinMax minMax){ /*value initialised to losing*/ int value = 0; if (minMax == MinMax.MIN) value = 1; else value = -1; boolean go = true; IteratorString iter = dict.iterator(); whil
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) { value = -1; go = false; } if (value2 == 1 && minMax == minMax.MAX) { value = 1; go = false; } } if (go == false) break; } return value; } 错误: Exception in thread "main" java.util.ConcurrentModificationException at java.util.HashMap$HashIterator.nextEntry(HashMap.java:810) at java.util.HashMap$KeyIterator.next(HashMap.java:845) at aStringGame.Main.checkLevel(Main.java:67) at aStringGame.Main.test(Main.java:117) at aStringGame.Main.main(Main.java:137) 这有什么问题? 解决方法
某处某处正在修改字典.我怀疑它可能会在这个电话中发生:
int value2 = checkLevel(removeWord(bigWord,passin); ^^^^ 编辑基本上,会发生的事情是对checkLevel()的递归调用通过另一个迭代器修改dict.这使得外部迭代器的快速失败行为成为可能. (编辑:李大同) 【声明】本站内容均来自网络,其相关言论仅代表作者个人观点,不代表本站立场。若无意侵犯到您的权利,请及时与联系站长删除相关内容! |