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  • Is HashMap in Java collision safe

    - by changed
    Hi I am developing a parser that needs to put key value pairs in hashmap. But a key can have multiple values which i can do in this way HashMap<String,ArrayList<String>> . But what happens if number of keys are very large and it start matching with other key's hashcode. Will that rewrite previous key's value ? thanks -devSunday

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  • best way to find out type

    - by laspal
    hi, I have a dict val_dict - {'val1': 'abcd', 'val': '1234', 'val3': '1234.00', 'val4': '1abcd 2gfff'} All the values to my keys are string. So my question is how to find out type for my values in the dict. I mean if i say`int(val_dict['val1']) will give me error. Basically what I am trying to do is find out if the string is actual string or int or float.` if int( val_dict['val1'): dosomething else if float(val_dict['val1']): dosomething thanks

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  • PHP's form bracket trick is to Django's ___?

    - by Matt
    In PHP you can create form elements with names like: category[1] category[2] or even category[junk] category[test] When the form is posted, category is automatically turned into a nice dictionary like: category[1] => "the input value", category[2] => "the other input value" Is there a way to do that in Django? request.POST.getlist isn't quite right, because it simply returns a list, not a dictionary. I need the keys too.

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  • Not able to add column value

    - by peter
    I have project which contain 4 tables among these shedule table Session column i am not able to add vaue,,this table contain three foriegn key from two tables(in which single table has two foreign keys here) i added values here..Any one has any idea about this..Actually my intention is to remove the error "the insert statement conflicted with the foreign key constraint sql server"

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  • How to pickle and unpickle objects with self-references and from a class with slots?

    - by EOL
    Is it possible to pickle an object from a class with slots, when this object references itself through one of its attributes? Here is a simple example: import weakref import pickle class my_class(object): __slots__ = ('an_int', 'ref_to_self', '__weakref__') def __init__(self): self.an_int = 42 self.ref_to_self = weakref.WeakKeyDictionary({self: 1}) # __getstate__ and __setstate__ not defined: how should this be done? if __name__ == '__main__': obj = my_class() # How to make the following work? obj_pickled = pickle.dumps(obj) obj_unpickled = pickle.loads(obj_pickled) # Self-references should be kept: print "OK?", obj_unpickled == obj_unpickled.ref_to_self.keys()[0]

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  • How to generate a LONG guid?

    - by Ron
    I would like to generate a long UUID - something like the session key used by gmail. It should be at least 256 chars and no more than 512. It can contain all alpha-numeric chars and a few special chars (the ones below the function keys on the keyboard). Has this been done already or is there a sample out there? C++ or C#

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  • String replace for personalize code generator

    - by Xurxof
    I must do a automatic codes generator with user-configurable string with predefined keys and can not find a good way to do it. For example, a string OT-{CustomCode}-{Date}-{##} could generate codes OT-C0001-20100420-01 OT-C0001-20100420-02 I thought of using RegExpr.Replace(), but I would have problems if the code of a customer was {##} Any help is welcome! (and sorry for my english)

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  • windows keydown listeners in C

    - by numerical25
    I am having a very hard time finding resources that talk about the windows message system. Mainly the keydown constant variables. I need to know what const varibles I need to listen for all keypress especially the arrow keys for C

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  • Reversed Sorted Dictionary?

    - by Mark
    I have a SortedDictionary as defined like this: SortedDictionary<TPriority, Queue<TValue>> dict; But I want to sort the keys in reverse order. I assume I need set the Comparer, but what comparer do I use for a generic TPriority? Note that TPriority implements IComparable.

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  • What language is this?

    - by Blue
    got some keys with patterns like 4AC59BAA63A64327DCE12C0B2CD1A397 and B9E685495FECFC9854E7DBA508D91213 they have 32 chars and i would like not to decrypt then but to be able to make my own, its something like a hash of a file

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  • Database design -- does it respect 3rd NF?

    - by Flavius
    Hi I have the following relations (tables) in a relational model Person person_id, first_name, last_name, address Student person_id, matr_nr Teacher person_id, salary Lecture lecture_id, lect_name, lect_description Attendees lecture_id, person_id, date I'm wondering about the functional dependencies of Student and Teacher. Do these tables respect the 3rd normal form? Which should be the primary keys of these tables?

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  • Air/Flex concatenating a variable with a property

    - by Deyon
    I have three text boxes on the stage id=red, blue, green same as the keys in my cars Object/Array public function carsToBox():void { var cars:Object={red:"300zx",blue:"Skyline",green:"Supra"}; for(var tempObj:String in cars) { tempObj.text= cars[tempObj];//this trows errors } } So I'm thinking "tempObj.text" would equal red.text but I can't stick "tempObj" with ".text" is there a way this can be done?

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  • Building a custom textbox in GTK

    - by CommuSoft
    I want to make my own GTK# Textbox, the textbox should draw the text and it's cursor on a special way. However keyboard and mouse-handling is quite complex and is also influenced by for instance the operating system (for instance the use of dead keys) Is there a way to build such a control without having to worry about keyboard input? I assume I have to make a textbox control that inherits the original textbox control. How can I handle drawing requests and mouse movements?

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  • Converting different registry value types to string?

    - by Tom
    Hi, im traversing through the registry, taking the values of the keys and storing them as strings. I have discovered there are many different types. Some of these types are causing my filestream writer to fail. Is it possible to convert all of the below into a string form. The actual data value is not important, just the ability to differentiate between different values. DWORD ExpandString Binary (is this just the same as byte[] ?) MultiString

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  • What will this B-tree look like?

    - by Phenom
    The B-tree is of order 4, meaning that it can hold 4 pointers, and 3 keys. The following is inserted: A G I Y Since they can't all fit in one node, I know that the node will split. So I know there's going to be a root node with 2 child nodes after these things are inserted, but I don't know exactly what they'll look like.

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  • how do I iterate through multiple properties in jsp

    - by David
    I'm trying to iterate through a properties file which contains a list of keys like: message.p1 message.p2 message.p3 I don't know how many properties will be in the file, so I want to display any that are present. Is there a standard tag like <fmt:message> that can handle this, or do I need to write some jsp script to handle the loop?

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  • Sorting a C# Dictionary

    - by SoulReaver
    I have a dictionary in C# like Dictionary<Person, int> and I want to sort that dictionary in place with respect to keys (a field in class Person). How can I do it? Every available help on the internet is that of lists with no particular example of in place sorting of Dictionary. Any help would be highly appreciated!

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  • Relational Database arrays (H2, Java)

    - by Daddy Warbox
    I seem to have two options on how to implement arrays, and I want to know which I should go with: Use the ARRAY data type and (from what I understand) effectively serialize data objects into the database (which in my case are just wrapped primitive types; don't know of another way to make this work). Use a separate table and map with foreign keys for each array item. If you have experience with this (especially with H2), which would you recommend?

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