nullable

The checking of the @Nonnull and @Nullable annotations in Eclipse is an early beta . The largest problem is that there it no knowing over the null behavior of the Java API. Are there any other plugins that are better currently? It's now integrated in Eclipse Kepler. I have found that FindBugs works well and is easy to use. FindBugs Plugin Get Eclipse SDK 3.7(or Indigo) Enter this update URL: http://download.eclipse.org/objectteams/updates/contrib Select and install : JDT Null Annotation Checker (Early Access) Object Teams Equinox Integration The largest problem is that there it no knowing over

Are XML parsers/deserializers in general able to tell the difference between nillable elements explicitly set to null and optional elements that are left out ? Assume that we have the following complex type: <complexType name="NiceType"> <sequence> <element name="niceElem" nillable="true" type="int" minOccurs="0" /> </sequence> </complexType> Element explicitly set to null (example 1): <niceType> <niceElem xsi:nil="true"/> </niceType> Element omitted (example 2): <niceType> </niceType> Would parsers in general, such as JAX-B implementations or .NET alikes such as the XML module of WCF, be able

This is a question on how to gracefully circumvent the nullability of init in NSObject class. So here is a classic objective-c implementation: + (instancetype)sharedInstance { static dispatch_once_t onceToken; static id sharedInstance; dispatch_once(&onceToken, ^ { sharedInstance = [[self alloc] init]; }); return sharedInstance; } But now I want to declare it as nonnull , if possible: + (nonnull instancetype)sharedInstance; Unfortunately, init returns a nullable instancetype value. Should I add an NSAssert or something after calling init ? I noticed that some people even document nonnull

public virtual int Fill(DataSetservices.Jobs_detailsDataTable dataTable, global::System.Nullable<global::System.String> fromdate, global::System.Nullable<global::System.DateTime> todate) I wrote above code in dataset.xsd in C#, but it is throwing an error: Error 1 The type 'string' must be a non-nullable value type in order to use it as parameter 'T' in the generic type or method 'System.Nullable' Suggest me how to use string because i want to use string and nothing else string is already nullable, because it's a reference type. You don't need to wrap it in Nullable in order to have a null

I had this interesting discussion today with a colleague. We were debating two pieces of code in C#. Code Snippet 1: if(!reader.IsDBNull(2)) { long? variable1 = reader.GetInt64(2) } Code Snippet 2: long variable1 = reader.IsDBNull(2) ? (long?) null : reader.GetInt64(2) Question is: is it a good practice to cast null into a nullable long? Or would you rather use the traditional if statement to avoid casting null to nullable long. The expressions (type?)null , default(type?) and new Nullable<type>() end up being compiled into the same opcodes: long? x = (long?)null; long? y = default(long?);

This question already has answers here : What does “DateTime?” mean in C#? (6 answers) Closed 6 years ago . I just ran across some code while working with System.DirectoryServices.AccountManagement public DateTime? LastLogon { get; } What is the ? after the DateTime for. I found a reference for the ?? Operator (C# Reference) , but it's not the same thing. (280Z28: Here is the correct link for Using Nullable Types .) The ? makes it a nullable type (it's shorthand for the Nullable<T> Structure and is applicable to all value types). Nullable Types (C#) Note: The ?? you linked to is the null