简体   繁体   中英

In Scala, How to get the returned TypeTag of a class method?

I have a class:

package org.apache.project

class Foo {

def bar: List[Bar] = ...
}

is it a way in scala reflection that allows me to get typeOf[List[Bar]] from the className "org.apache.project.Foo" and the method name "bar"?

Thanks a lot for your help!

Yes, if you have Foo as a Type , you can find the return type of the method bar as a Type as well.

import scala.reflect.runtime.universe._

typeOf[Foo]                        // Get the type of Foo
   .decls                          // Get Foo's declared members
   .find(_.name.toString == "bar") // Find the member named "bar" as a symbol
   .head                           // Unsafely access it for now, use Option and map under normal conditions
   .asMethod                       // Coerce to a method symbol
   .returnType                     // Access the return type

The technical post webpages of this site follow the CC BY-SA 4.0 protocol. If you need to reprint, please indicate the site URL or the original address.Any question please contact:yoyou2525@163.com.

 
粤ICP备18138465号  © 2020-2024 STACKOOM.COM