hashtable


Getting NullPointerException from Hashtable while using GObject method

♀尐吖头ヾ 提交于 2020-01-21 15:21:07
问题 So I try to create a small Zombie-Shooter game. I use a GTurtle class from ACM package (jtf.acm.org). I have additional thread for a GTurtle, which is a GObject. I have a run method with while loop, that is checking if boolean is true, if it is - this.forward() method gets executed. I tried running game and pressing button, if it is W or D, boolean in GTurtle object gets changed and Thread executes action. Then I get this exception: java.lang.NullPointerException at java.util.Hashtable.put

how to convert a hash table in string in java

天大地大妈咪最大 提交于 2020-01-16 10:03:29
问题 I'm new in java and i want to convert a hash table in the form of a string, with each pair separated by any special character. I'm little confuse how to apply loop on the hash table and extract values from. Please explain me how to do this. Thanks in advance public String parseHashtable(Hashtable detailHashtable){ String hashstring= ""; foreach(){ hashstring += key + "=" + hashtable[key] + "|"; } return hashstring; } 回答1: String seperator = "|"; StringBuilder sb = new StringBuilder(); Set

hsearch_r overwrites hash table

让人想犯罪 __ 提交于 2020-01-16 01:10:27
问题 I'm trying to see if I can put a new feature into inotifywait that during the watching phase tracks the list of directories that did not receive any event on them, and before it quits, it prints the list. As of now, inotifywait is capable of showing on directories that received an event. What I'm looking for is for a list of directories that did not receive any event. To achieve this, I'm taking the following approach. While inotifywait is placing watches, generate an array of all the

Linear probing huge sequences of keys with unequal hash

人走茶凉 提交于 2020-01-15 08:12:48
问题 There is one thing about linear probing (hash tables) that is not intuitive to me. If I put key1 which hash results to array index 1. Then I put key2 -> array index 2. Then I put key3 -> again array index 1, this will go to array index 3. Then when I search for key3 I should go through indexes that contain keys that do not have the same hash as mine at all. Isn't this waste? If the sequence is really big and contains many keys (for example I have 20 elements, then null, for any key that

Collision Resolution : Quadratic Probing vs. Separate Chaining

你说的曾经没有我的故事 提交于 2020-01-13 03:46:17
问题 Ok, so I've been doing some experiments with hash tables and different collision resolution problems. I'm trying to figure out which is more efficient for doing finds, a hash table that uses separate chaining or quadratic probing for collision resolution. My results suggest that separate chaining is faster than quadratic probing even for small load factors such as 0.4 or 0.2. Is this the case or are my results wrong? 回答1: The difference in processing cost between the two approaches are that

How to store a HashTable in the usersettings?

北慕城南 提交于 2020-01-13 02:44:07
问题 In .NET you can select a hashtable as type for a usersetting. However when I save it and retrieve it in this way, it doesnt seem to have saved it at all. Hashtable t = new Hashtable(); t.Add(1,"Foo"); t.Add(2,"Bar"); Properties.Settings.Default.Setting = t; Properties.Settings.Default.Save(); if(Properties.Settings.Default.Setting != null) foreach (DictionaryEntry entry in Properties.Settings.Default.Setting) { MessageBox.Show(entry.Key + " " + entry.Value); } Why doesnt it serialize it in

Pandas installation on Mac OS X: ImportError (cannot import name hashtable)

我是研究僧i 提交于 2020-01-12 13:42:46
问题 I would like to build pandas from source rather than use a package manager because I am interested in contributing. The first time I tried to build pandas, these were the steps I took: 1) created the virtualenv mkvirtualenv --no-site-packages pandas 2) activated the virtualenv 3) installed Anaconda CE. However, this was installed in ~/anaconda. 4) cloned pandas 5) built C extensions in place (pandas)ems ~/.virtualenvs/pandas/localrepo/pandas> ~/anaconda/bin/python setup.py build_ext --inplace

ANSI C hash table implementation with data in one memory block

放肆的年华 提交于 2020-01-12 10:13:55
问题 I am looking for an open source C implementation of a hash table that keeps all the data in one memory block, so it can be easily send over a network let say. I can only find ones that allocate small pieces of memory for every key-value pair added to it. Thank you very much in advance for all the inputs. EDIT: It doesn't necessarily need to be a hash table, whatever key-value pair table would probably do. 回答1: On a unix system I'd probably utilise a shared memory buffer (see shm_open()), or

ANSI C hash table implementation with data in one memory block

谁说我不能喝 提交于 2020-01-12 10:13:07
问题 I am looking for an open source C implementation of a hash table that keeps all the data in one memory block, so it can be easily send over a network let say. I can only find ones that allocate small pieces of memory for every key-value pair added to it. Thank you very much in advance for all the inputs. EDIT: It doesn't necessarily need to be a hash table, whatever key-value pair table would probably do. 回答1: On a unix system I'd probably utilise a shared memory buffer (see shm_open()), or

Hashtable implementation for Delphi 5

我与影子孤独终老i 提交于 2020-01-12 07:12:23
问题 Do you know a good and free Hashtable imlementation for Delphi 5 ? I need to organize a huge amount of data in a hastable and I am bit worried about memory leak issues that I found in most available implementations on the web. Tks 回答1: You can also check out the open-source / formerly commercial TurboPower SysTools. Not sure how much it is being updated. At one point Julian Bucknall recommended it over his EZDSL library, although that was back when he still worked fur TurboPower and it was

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