hashtable

问题 I have a Socket server waiting for the clients send messages in a json format. I do not need to store the data into database, but for now, I would like to keep them in a hashtable. So, when the client sent a message the server will add it to the hashtable without losing the previous messages. Here is the declaration of my hashtable: private static Hashtable<Integer,String> table = new Hashtable<Integer,String>(); Here is the method that is called a message reach the server: private void

问题 i am writing a program in C# i have a code like this Hashtable ht = new Hashtable(); ht.Add("1", "One"); ht.Add("2", "Two"); ht.Add("3", "Three"); ht.Add("4", "Four"); but Compiler sort it i wanna know how can i prevent sorting hashtable please help me 回答1: A HashTable doesn't do sorting as such. It does rearrange the items based on their hash code, so the original order isn't preserved. If you want to preserve the original order, or want to specify a sort order, you can't use a HashTable

问题 It turns out that within a Dictionary extension, the subscript is quite useless since it says Ambiguous reference to member 'subscript' . It seems I'll either have to do what Swift does in its subscript(Key) or call a function. Any ideas? For example, public extension Dictionary { public func bool(_ key: String) -> Bool? { return self[key] as? Bool } } won't work, since the subscript is said to be ambiguous. ADDED My misunderstanding came from the fact that I assumed that Key is an

问题 i am learning data structures and so far have seen linked list,binary tress, and hash tables. I am trying to find a general way to approach a practice problem in which it gives me freedom to use these data structures to solve it. I was hoping to receive some feedback on the best way to solve this problem. The problem tells me to read two files, one file with all the classes and pre-requisites needed to complete a degree and another file that has all classes that have been completed and figure

问题 This is a similar question to Linear Probing Runtime but it regards quadratic probing. It makes sense to me that "Theoretical worst case is O(n)" for linear probing because in the worst case, you may have to traverse through every bucket(n buckets) What would runtime be for quadratic probing? I know that quadratic probes in a quadratic fashion -1, 4, 9, 16, ..... My initial thought was that it's some variation of log n(exponential) but there isn't a consistent base. 回答1: If there are n - 1

问题 Hashtable iHashtable=new Hashtable(); iHashtable.put("Name", "Jhon"); iHashtable.put("Address","India"); Enumeration iEnumeration=iHashtable.keys(); while(iEnumeration.hasMoreElements()) { Object iresult1=iEnumeration.nextElement(); String iresult2=(String) iHashtable.get(iresult1); System.out.println(iresult1); System.out.println(iresult2); My problem is I want to put the value at LWUIT table dynamically using the HashTable key and value,here is iresult1 and iresult2,using the key and value

问题 Hashtable iHashtable=new Hashtable(); iHashtable.put("Name", "Jhon"); iHashtable.put("Address","India"); Enumeration iEnumeration=iHashtable.keys(); while(iEnumeration.hasMoreElements()) { Object iresult1=iEnumeration.nextElement(); String iresult2=(String) iHashtable.get(iresult1); System.out.println(iresult1); System.out.println(iresult2); My problem is I want to put the value at LWUIT table dynamically using the HashTable key and value,here is iresult1 and iresult2,using the key and value

问题 I have a CSV that uses a running log to update the status of a lot of automated tasks. I need a quick method to look up information from the CSV so I can modify it and export it back to the CSV. For this example, let's assume that I'm keeping track of running processes and I want to use the "ID" property as a key for the hashtable. $pathCsv = 'C:\test\test.csv' Get-Process | Export-Csv $pathCsv I can import from the CSV just fine, but I don't know how to convert it to a hashtable or get it

问题 I have a server to receive request from multiple client. I have done this with threads. I want to insert some user name and password to hash table. For that I am using double hash method. It was inserted successfully. But I want to know when user enter a user name, I need to search on hash table whether this username already present. But I can't do it now. I know the concept like using hashing. Get the index using hashfunction1 through username and use double hash like this. But how can I

问题 I am trying to use Double Hashing to hash a String key into a hash table. I did something like: protected int getIndex(String key) { int itr = 0, size = this.values.length, index1, index2, index = 0; do { // do double hashing to get index for curr [itr] (iteration) index1 = Math.abs(key.hashCode()) % size; index2 = size - ((key + key + "#!@").hashCode() % size); # trying very hard to eliminate clash, but still fails ... TA and AT gets index 2 when size = 5 index = (index1 + (itr * index2)) %