hashtable

问题 I am trying to implement a program that will take a users input, split that string into tokens, and then search a dictionary for the words in that string. My goal for the parsed string is to have every single token be an English word. For Example: Input: aman Split Method: a man a m an a m a n am an am a n ama n Desired Output: a man I currently have this code which does everything up until the desired output part: import java.util.Scanner; import java.io.*; public class Words { public static

问题 I read that hash tables in Haskell had performance issues (on the Haskell-Cafe in 2006 and Flying Frog Consultancy's blog in 2009), and since I like Haskell it worried me. That was a year ago, what is the status now (June 2010)? Has the "hash table problem" been fixed in GHC? 回答1: The problem was that the garbage collector is required to traverse mutable arrays of pointers ("boxed arrays") looking for pointers to data that might be ready to deallocate. Boxed, mutable arrays are the main

问题 I have a hash table here and I have it eventually outputting to an Excel spreadsheet, but the issue appears to be the way the system sorts the hash table by default. I want it to return the machines in the same order that they are inputted, they way it currently works is a box pops up and you paste in all your machine names so they are all in memory prior to the foreach loop. I was previously sorting this by the longest uptime but it now needs to be the same way they are inputted. My initial

问题 Is there a way to keep the order of keys in a hashtable as they were added? Like a push/pop mechanism. Example: $hashtable = @{} $hashtable.Add("Switzerland", "Bern") $hashtable.Add("Spain", "Madrid") $hashtable.Add("Italy", "Rome") $hashtable.Add("Germany", "Berlin") $hashtable I want to retain the order in which I've added the elements to the hashtable. 回答1: There is no built-in solution in PowerShell V1 / V2. You will want to use the .NET System.Collections.Specialized.OrderedDictionary:

问题 Is it possible to have multiple values for the same key in a hash table? If not, can you suggest any such class or interface which could be used? 回答1: No. That's kind of the idea of hash tables. However, you could either roll your own with a Map<YourKeyObject, List<YourValueObject>> and some utility methods for creating the list if it's not present, or use something like the Multimap from Google Collections. Example: String key = "hello"; Multimap<String, Integer> myMap = HashMultimap.create(

问题 I was wondering how Java orders items in the Map ( HashMap or Hashtable ) when they are added. Are the keys ordered by the hashcode, memory reference or by allocation precedence...? It's because I've noticed same pairs in the Map are not always in the same order 回答1: java.util.HashMap is unordered; you can't and shouldn't assume anything beyond that. This class makes no guarantees as to the order of the map; in particular, it does not guarantee that the order will remain constant over time.

问题 Closed . This question needs details or clarity. It is not currently accepting answers. Want to improve this question? Add details and clarify the problem by editing this post. Closed 2 years ago . Why doesn't my Java HashMap work? My object has the property that .equals equality implies hashCode equality. You can assume that I'm modifying a field of the object after I add the object to the HashMap . 回答1: You can assume that I'm modifying a field of the object after I add the object to the

问题 Hey guys thank you so much, in advance, for your help! I have a data step before the code below called "simulation_tracking3", that outputs something like: CDFx Allowed_Claims .06 120 .12 13 .15 1400 My hash table averages the Allowed_Claims based on a randomly generated value (from 0 to 1). For example, let's call this Process A, if Px = rand('Uniform',0,1) yields .09, I want it to average between the Allowed_Claims values where Px = .06 and Px = 0.12, which is (120+13)/2 The role of the

问题 I have managed considerable progress in parsing the bib file, but the next step is quite tough for my present level of understanding. I have created bison and flex code, that parses the bib file above correctly: %{ #include <stdio.h> %} // Symbols. %union { char *sval; }; %token <sval> VALUE %token <sval> KEY %token OBRACE %token EBRACE %token QUOTE %token SEMICOLON %start Input %% Input: /* empty */ | Input Entry ; /* input is zero or more entires */ Entry: '@' KEY '{' KEY ','{ printf("=====

问题 I have managed considerable progress in parsing the bib file, but the next step is quite tough for my present level of understanding. I have created bison and flex code, that parses the bib file above correctly: %{ #include <stdio.h> %} // Symbols. %union { char *sval; }; %token <sval> VALUE %token <sval> KEY %token OBRACE %token EBRACE %token QUOTE %token SEMICOLON %start Input %% Input: /* empty */ | Input Entry ; /* input is zero or more entires */ Entry: '@' KEY '{' KEY ','{ printf("=====