Browse questions answered by Jon Skeet

My program cannot break out of 'While Loop' when calculating # of divisors for a certain integer?

When I run the program in eclipse, I cannot break out of the while loop after the user enters a certain integer to move on and actually calculate the number of divisors it has and...

Look at your if statement: if (N < 0) break; You're breaking out of the loop if the user enters a negative number - but you want to break out if they enter a positive number: if (N > 0) break; (I haven't looked at the... more 12/28/2013 8:22:19 AM

Using NodaTime, how to convert an Instant to the corresponding system's ZonedDateTime?

I have an event log in a database with the events' datetime stored as UTC time. In my application, where I'm using NodaTime, I get the value as a DateTime and then convert it to...

Use IDateTimeZoneProvider.GetSystemDefault for the time zone provider you're interested in. For example: var systemZone = DateTimeZoneProviders.Tzdb.GetSystemDefault(); var zonedDateTime = instant.InZone(systemZone); Or use... more 12/27/2013 9:05:45 PM

C# Date/Time Formatting

Using C#, I am trying to format a date in to the following string format: YYYYMMDD_HHMM.xlsx Here is my code: DateTime.Today.AddDays(0).ToString("yyyymmdd") + "_" +...

You're using mm, which is minutes, not months - and you're trying to print the time using DateTime.Today, which always returns midnight at the start of the day. It's not clear why you're adding 0 days, either. I'd use: DateTime now =... more 12/27/2013 8:27:52 PM

Accessing sub array and counting an element in arrays in Java

I have 2 questions about arrays in java and any help would be appreciated. Is there a way to access a sub-array (something like this on python: array[1:5]) I want to know does...

For accessing part of an array, you could use Arrays.asList to obtain a List<E>, and then use the subList method to obtain a slice: import java.util.*; public class Test { public static void main(String[] args) { ... more 12/27/2013 12:16:42 PM

How to cast object to Action<T>

I've created a simple message bus that queues and emits/publishes events. I'm using StructureMap to locate the registered handlers (Action<T>) of the event but am not sure...

Since I can't cast to Action I'm assuming that Action is not covariant? Action<T> is contravariant - which makes sense, because an Action<object> can be treated as an Action<string> (both can accept a string... more 12/27/2013 11:42:44 AM

How to get the string instance in guice

Lets say I have binded my strings in guice like this bind(String.class).annotatedWith(MasterDatabase.class).toInstance("integration"); If I have the handler to injector for...

Well you'd normally use constructor injection using the annotation: @Inject public SomeType(@MasterDatabase String databaseName) Or you could explicitly request it from the injector: String databaseName =... more 12/27/2013 11:34:01 AM

A child container failed during start java.util.concurrent.ExecutionException:

hi i am trying to run JAX-RS Web Service project which contain sample hello world web service, but publishing it in the Tomcat Server 7.0 shows following errors. Below are...

Well this is the root cause: Caused by: java.lang.ClassNotFoundException: com.google.common.base.Function ... so it looks like you're probably missing a dependency jar file (Guava, by the looks of it) from the classpath of the relevant... more 12/27/2013 9:00:03 AM

set limit to number of children in an element in xml

I have an XML file as follows <abc> <property> <Recentlyopenedfiles> <File Path="c:\hai.txt" /> <File Path="C:\old.java" /> ...

There are declarations in XSD to limit the number of child elements, but I don't think that's relevant in your particular case. When it comes to parsing and then modifying the XML, you'll just need to perform the limiting by hand. In... more 12/27/2013 8:58:14 AM

Dollar ($) sign after activity class name in Android logs (non anonymous inner class)

I am going through some crash logs for my app and the stack trace shows something like : at MyActivity.formatDouble(MyActivity.java:182) at...

I suspect that line 167 is within an anonymous class within MyActivity, and that access$47 is simply a trampoline method to allow onCameraChange to call a private method within MyActivity. (The JVM wouldn't allow that, so the Java compiler... more 12/26/2013 9:23:36 PM

clarification needed on Java's 32 bit integer representation system?

I need some clarifications regarding the binary representation of decimal in Java (or any other language for that matter). pardon, if this is too basic, but I need to understand...

so it means, the when 31 bits are turned on, I do not get the additive sum of the powers of 2. Yes you do - you get 20 + 21 + 22 + 23 + ... + 230... which is 231 - 1, exactly as you're seeing. You're not adding 231 because that would... more 12/26/2013 8:36:16 PM