41 questions
After setting up the scala development environment and executing the following code, There is an error and it cannot be executed properly.How can I start it well?object Hello { defmain(args:Array [Str...
I think java has been installed, but >javac-versionjavac1.8.0_302Probably because stb is not installed well, IDE cannot use scala C:\>sbtsbt-version[warn]Neither build.sbt nor a'project' directo...
trite Aobject B extensions A { println(B)}object Sequences A { println(C)}object Main { defmain(args:Array [String]):Unit={ println (RUN) }}At this time, the standard output is RUNwill only be display...
Currently, I am trying to list the words entered from the form that match the title.defindByWord(word:String): Future [Seq[Item]]=db.run{ Query.filter(row=>(row.title like % + word+%).result}This i...
Why isn't scala.collection.mutable.TreeMap sold and other Map (for example, HashMap)?(Furthermore, the immutable TreeMap was final, and HashMap was sold, so no modifier criteria could be found.)I thou...
I'm a beginner at Scala (I read a cup book but I don't understand many things) This is my first time asking stack overflow questions, so please let me know if there are any points that I don't underst...
I have looked around some sample codes for Ask in Scala's Actor, all of which have implicitly set the timeout as implicit val timeout=Timeout(5seconds) as shown in the following URL:Does that mean tha...
Assume you have the following tables and classes:sqlcreate table `sample`.`member`(id serial, name varchar(64));class case class member (id: Long, hoge: String)I would like to map the name column of t...
If the parent-child actor uses withRouter() to configure the router, the child will not be able to see context.parent.I asked because I wanted to know the solution and the reason.First of all, the con...
If the parent-child actor uses withRouter() to configure the router, the child will not be able to see context.parent.I asked because I wanted to know the solution and the reason.First of all, the con...
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