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  • NullPointerException when thying to add an object to a PriorityQueue

    - by meagan
    i keep getting a null pointer exception when trying to add an object to a priority queue i initialize the queue: private PriorityQueue<NodeObject> nodes; and here i try to add to it: NodeObject childNode = new NodeObject(child, 1); nodes.add(childNode); why doesn't this work? i know my NodeObject is not null because i create it right before i add it.

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  • How to create javascript object from form elements using jQuery

    - by ob
    I'd like to be able to create a javascript object from my html form and am wondering if there's a good way to do this using jquery. I guess what i'm looking for is something similar to $.serialize, but which would result in a map instead of a string. <form> <input type="text" name="foo1" value="bar1" /> <input type="text" name="foo2" value="bar2" /> </form> desired result: { foo1:"bar1", foo2:"bar2" }

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  • StackOverFlow Exception while Writing the Object Graph in to XAML

    - by Jose
    I am trying to Write an object stream into a XAML file but i end up in StackoverFlowException . In the CallStack i could see "The maximum number of stack frames supported by Visual Studio has been exceeded" This is the piece of code i'm trying to execute. StreamWriter xamlStream =new StreamWriter(File.OpenWrite("a.xaml")); string myXaml = System.Windows.Markup.XamlWriter.Save(objectInstance); xamlStream.Write(myXaml); Thanks ...!

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  • How to get dynamically session object in struts2

    - by Sujeet Singh
    I am trying to get dynamically session object in struts2 application. <s:if test="%{#session['resToken'].bookingType == 1}"> resToken can be get by <s:property value="%{resToken}">.. But I can't write <s:property> within <s:if test=""> its giving me error of double quotes.. org.apache.jasper.JasperException: /WEB-INF/jsp/booking/banquet/guest-Info-View.jsp(150,40) Unterminated &lt;s:if tag

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  • Python 3 with numpy and object refernces

    - by user963386
    I need to create a large matrix (array) structure (3 axis) and each element should store the reference to a Python object (myclass instance). Is it possible to use numpy to create such an array. Which data type should I use in order to store Python references? The advantage of numpy is the support of slicing at different levels. The alternativee is to create a nested (nested) list but it is a cumbersome solution.

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  • Enumerator problem, Any way to avoid two loops?

    - by pug
    I have a third party api, which has a class that returns an enumerator for different items in the class. I need to remove an item in that enumerator, so I cannot use "for each". Only option I can think of is to get the count by iterating over the enum and then run a normal for loop to remove the items. Anyone know of a way to avoid the two loops? Thanks

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  • compare two following values in numpy array

    - by Billy Mitchell
    What is the best way to touch two following values in an numpy array? example: npdata = np.array([13,15,20,25]) for i in range( len(npdata) ): print npdata[i] - npdata[i+1] this looks really messed up and additionally needs exception code for the last iteration of the loop. any ideas? Thanks!

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  • Determine the relative compliment of two IEnumerable<T> sets in .net

    - by SFun28
    Hi! Is there an easy way to get the relative compliment of two sets? Perhaps using LINQ? http://en.wikipedia.org/wiki/Complement_(set_theory) I have to find the relative compliment of a set A relative to B. Both A and B are of type HashSet but I think the algorithm could be made more generation (IEnumerable or even ISet)? I could use a solution in either vb.net or C#.

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  • Java - Make an object collection friendly

    - by DutrowLLC
    If an object holds a unique primary key, what interfaces does it need to implement in order to be collection friendly especially in terms of being efficiently sortable, hashable, etc...? If the primary key is a string, how are these interfaces best implemented? Thanks!

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  • Finding out the common / uncommon elements between two Arrays in PHP

    - by Veera
    Consider I have two arrays: $friends = Array('foo', 'bar', 'alpha'); $attendees = Array('foo', 'bar'); Now I need to populate a new array $nonattendees which contains only the elements which are in $friends array and not in $attendees array. i.e, $nonattendees array should be populated with 'alpha'. Is there any in built array operation available in PHP to achieve the above functionality or should I write my own for loops?

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  • Can not find StructureMapConfiguration object

    - by Am
    I see a lot of exampls of how to use StructureMap in a asp.net project like this: StructureMapConfiguration.ForRequestedType<IResourceA>() .TheDefaultIsConcreteType<ResourceB>() .CacheBy(InstanceScope.Singleton); Yet, in my Global.asax I can not access the StructureMapConfiguration object even when I import the StructureMap namespace. What is the deal here? Am I missing something?

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  • Mock Object and Interface

    - by tunl
    I'm a newbie in Unit Test with Mock Object. I use EasyMock. I try to understand this example: import java.io.IOException; public interface ExchangeRate { double getRate(String inputCurrency, String outputCurrency) throws IOException; } import java.io.IOException; public class Currency { private String units; private long amount; private int cents; public Currency(double amount, String code) { this.units = code; setAmount(amount); } private void setAmount(double amount) { this.amount = new Double(amount).longValue(); this.cents = (int) ((amount * 100.0) % 100); } public Currency toEuros(ExchangeRate converter) { if ("EUR".equals(units)) return this; else { double input = amount + cents/100.0; double rate; try { rate = converter.getRate(units, "EUR"); double output = input * rate; return new Currency(output, "EUR"); } catch (IOException ex) { return null; } } } public boolean equals(Object o) { if (o instanceof Currency) { Currency other = (Currency) o; return this.units.equals(other.units) && this.amount == other.amount && this.cents == other.cents; } return false; } public String toString() { return amount + "." + Math.abs(cents) + " " + units; } } import junit.framework.TestCase; import org.easymock.EasyMock; import java.io.IOException; public class CurrencyTest extends TestCase { public void testToEuros() throws IOException { Currency testObject = new Currency(2.50, "USD"); Currency expected = new Currency(3.75, "EUR"); ExchangeRate mock = EasyMock.createMock(ExchangeRate.class); EasyMock.expect(mock.getRate("USD", "EUR")).andReturn(1.5); EasyMock.replay(mock); Currency actual = testObject.toEuros(mock); assertEquals(expected, actual); } } So, i wonder how to Currency use ExchangeRate in toEuros(..) method. rate = converter.getRate(units, "EUR"); The behavior of getRate(..) method is not specified because ExchangeRate is an interface.

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  • Silverlight Two Way Data Binding on Key Up

    - by kouPhax
    Is there a way to fire a two way data bind when the key up event fires in Silverlight. Currently I have to lose focus on the textbox to get the binding to fire. <TextBox x:Name="Filter" KeyUp="Filter_KeyUp" Text="{Binding Path=Filter, Mode=TwoWay }"/>

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  • VBScript: Passing Object to Function?

    - by ioplex
    The below example generates an error: VBScript compilation error: Cannot use parentheses when calling a Sub This error does not occur if all parameters are not objects. Is there a special way to pass object parameters to VBScript functions? Option Explicit Dim obj Function TestFunc(obj) WScript.Echo "Why doesn't this work?" End Function Set obj = CreateObject("Scripting.Dictionary") obj.Add("key", "val") TestFunc(obj) ' Error here!

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  • How to loop on a JSON object?

    - by Damiano
    Hello, I have this JSON object: {"time":"123456789", "raw":"chat_history", "data":{ "msg":[ {"time":1111111111, "user":"user1", "text":"text from user1"}, {"time":2222222222, "user":"user2", "text":"text from user2"}, {"time":3333333333, "user":"user3", "text":"text from user3"}, {"time":4444444444, "user":"user4", "text":"text from user4"} ] }} I have to create a FOR to loop the elements of data.msg and print it: I would print these results with the FOR: 11111111111 - user1 - text from users1 22222222222 - user2 - text from users2 33333333333 - user3 - text from users3 44444444444 - user4 - text from users4 Could you help me? Thank you very much

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  • Value Object and View Model Property

    - by William
    I am working on a solution that used DDD for architecture. I have a property in my ViewModel which points to a ValueObject, the view model also implements INotifyPropertyChanged interface. The value of the ValueObject will change as a user enters data on the front end. The problem I am running into is the value object is suppose to be immutable. How can I work around this issue? Thank you in advance.

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  • How to wrap two unmannaged C++ functions into two managed C# functions?

    - by Gbps
    I've got two unmanaged C++ functions, Compress and Decompress. The arguments and returns go as followed: unsigned char* Compress (unsigned char*,int) unsigned char* Decompress (unsigned char*,int) Where all uchars are arrays of uchars. Could someone please help me lay out a way to convert these into managed C# code using the Byte[] array instead of unsigned char*? Thank you very much!

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