collections

问题 I am using VB.Net and would like to use a LinkedList. Only problem is that it is a multithreaded application. I saw from MSDN that Syncroot is an explicit implementation of the ICollection Interface. I found people wanting to do similar things with List(Of T). It seems that the solution there is to cast the list to the interface. I have tried to do what I would imagine to be a similar thing in VB.Net, basically: Dim TestLinkedList = New LinkedList(Of Long) SyncLock (Ctype(TestLinkedList,

问题 I have UniversalComparator and it does all the task related to sorting, It uses reflection API to recognized the method name and invocatio target. Now what happened is, I need to sort the sites , previously it was sorted using "name" , now what happened is, user need to upload documents in frequency of monthly, quarterly,semi and annually. REQUIREMENT If document not uploaded in any of the frequency, that data represent with white color, rest of the blocks are reprsented as red color. There

问题 I have an arraylist which contains some values with duplicates i want to collect those values into another Arraylist.... like Arraylist<String> one; //contains all values with duplicates one.add("1"); one.add("2"); one.add("2"); one.add("2"); Here, I want to get all the duplicates values in another arraylist... Arraylist<String> duplicates; //contains all duplicates values which is 2. I want those values which counts greater or equals 3..... Currently, I don't have any solution for this

问题 I have a Rails 3.2.14 app that tracks calls and each call has a pickup and dropoff facility from the Facility model which is an association. In the call model there is an association for the Region model (i.e. Houston, Dallas, Austin, etc) where we select a region based on where the call is coming from. What I'd like to do is be able to select a specific region (i.e. Houston) and in the pickup facility collection only show Houston region facilities. I'm assuming to start off with I'd need to

问题 So, I have this code: logic:iterate name="nameForm" property="name" id="nameId" indexId="index" bean:write name="nameId" property="field1"/ bean:write name="nameId" property="field2"/ This works great because I'm receiving a "table of objects" so I can do the iterate without issues. Now, on another page I need to do the same but the issue is I am not receiving a "table of objects" but an object itself. I tried it nonetheless and - as expected - got the error: Cannot create iterator for this

问题 Is there a more efficient way to combine 2 dictionaries in VBScript / VBA? I wrote the function below, but I'm worried about the performance impact: Function MergeDicts(Dct1, Dct2) 'Merge 2 dictionaries. The second dictionary will override the first if they have the same key Dim Res, Key Set Res = CreateObject("Scripting.Dictionary") For Each Key In Dct1.Keys() Res.Item(Key) = Dct1(Key) Next For Each Key In Dct2.Keys() Res.Item(Key) = Dct2(Key) Next Set MergeDicts = Res End Function 回答1: If

问题 We are using NoSQL (Cassandra) in our project. We have a Table A (5000 records) which is a master table. We have another Table B (2000 records). Table B have 4 columns and Table A have 25 columns. We exposed a REST service to get all records from B; like /service/getB. This service will return 6 columns in response as – { "result": [ { "col1FromB": "1B", "col2FromB": "2B", "col3FromB": "3B", "col4FromB": "4B", "col1FromA": "1A", "col2FromA": "2A" }, { "col1FromB": "11B", "col2FromB": "12B",

问题 I am a newbie in blackberry app development. I am making a Blackberry Project using BB JRE 5.0. And i want to integrate another project into it which is working fine with J2SE 1.5. How can i achieve this. Is it possible? If no, then how to use generic and collection classes in blackberry development. means which BB JRE supports collection and generic classes. Please suggest me some alternative, i ll be very thankful to you all. Thanks in Advance. 回答1: BlackBerry Java SDK does not support

问题 I have only seen examples where the result is a Java list of Scala doubles. I got as far as def getDistance(): java.util.List[java.lang.Double] = { val javadistance = distance.toList.asJava javadistance } but this is still a Java list containing Scala doubles ( distance is a member of the same class as getDistance ). 回答1: One has to use the java boxed variant in a map: def getDistance(): java.util.List[java.lang.Double] = { distance.toList.map(Double.box).asJava } 来源： https://stackoverflow

问题 In Collections class, class SynchronizedMap has two constructors. One takes only a map instance and another with a map and a mutex . SynchronizedMap(Map<K,V> m) { this.m = Objects.requireNonNull(m); mutex = this; } SynchronizedMap(Map<K,V> m, Object mutex) { this.m = m; this.mutex = mutex; } However, SynchronizedMap class is a private static class and only way to access it using provided wrapper method: public static <K,V> Map<K,V> synchronizedMap(Map<K,V> m) { return new SynchronizedMap<>(m)