optional-parameters

I have the following DAO with a query: @Dao public interface BaseballCardDao { @Query( "SELECT * FROM baseball_cards " + "WHERE brand LIKE :brand " + " AND year = :year " + " AND number LIKE :number " + " AND player_name LIKE :playerName " + " AND team LIKE :team" ) LiveData<List<BaseballCard>> getBaseballCards( String brand, int year, String number, String playerName, String team ); } The String parameters are "optional" in the sense that I can pass "%%" to match all rows due to the LIKE operator. But I cannot do this with year since it is an int . One solution is to add two different @Query

In the given example (sorry for code style, it was in the interest of a compact self-contained repro), the method called is always the virtual method in B that has the additional integer parameter, while I would expect that the method implemented in C would be the one called. using System; using System.Collections.Generic; using System.Linq; using System.Text; namespace MethodChoosing { class Program { static void Main(string[] args) { C c = new C(); c.M(); Console.ReadKey(); } } public class A { public virtual void M(bool? a = null) { Console.WriteLine("base base"); } } public class B : A {

This question already has answers here : Java optional parameters (16 answers) Closed 5 months ago . I want to write an average method in java such that it can consume N amount of items, returning the average of them: My idea was: public static int average(int[] args){ int total = 0; for(int i=0;i<args.length;i++){ total = total + args[i]; } return Math.round (total/args.length); } //test it average(1,2,3) // s**hould return 2. how can I change my method to consume any amount of parameters instead of int[] args so can work the way I want ? Cheers Java 5 supports varargs , which is what you

I'm fairly new to php and I am trying to figure how do I set an optional parameter after the first optional parameter? For example I have the following code: function testParam($fruit, $veg='pota',$test='default test'){ echo '<br>$fruit = '.$fruit; echo '<br>$veg = '.$veg; echo '<br>Test = '.$test; } If i make the following calls: echo 'with all parama'; testParam('apple','carrot','some string'); //we get: //with all parama //$fruit = apple //$veg = carrot //Test = some string echo '<hr> missing veg'; testParam('apple','','something'); //we get: //missing veg //$fruit = apple //$veg = //Test =

This piece of code compiles OK in VS 2010 in a framework 3.5 project (I triple checked that) public LoggingClient(string uri = "net.msmq://localhost/logging"){...} Why? I see nothing in the C# 4 spec ( doc version ), section 21.1, that says this should be backwardly compatible. How is it that I get no compilation error? Will this fail silently in some circumstances? Project + Properties, Build tab, scroll down, Advanced. You can change the Language Version to "C# 3.0" if you prefer to maintain source code compatibility. But yes, you are using the C# 4.0 compiler in VS2010, regardless of the

I am documenting a codebase using Doxygen and was wondering if there is a keyword for declaring an argument to a function to be optional. Something like: /*! \fn int add(int a, int b=0) \brief adds two values \param a the first operand \param \optional b the second operand. Default is 0 \return the result */ It seems like this is something that should exist, but I haven't been able to find it anywhere. Is there an actual option, or do I just need to make note in the description? Arne Mertz To answer your question: No, there is no such thing. But I don't share your opinion that there should be

I have this function that returns a reference type. Now, this function has two optional parameters both of which are instances of the DateTime class. The function is something like this: public DateTime GetDate(DateTime start = DateTime.MinValue, DateTime end = DateTime.MinValue) { // Method body... } The error from VS is: Default parameter value for 'start' must be a compile-time constant Of course, the error applies to the second parameter and I perfectly understand what is happening. What I really want is to know if there is a way to go about this, that is, having optional parameters in the