CODEWITHSUNDEEP
javaeclipsescalatypes
Mohammad Fajar
Mohammad Fajar

Reputation: 1007

Change scala type specification to java type specification

How to change all variable with scala type (like Boolean) to java type (like java.lang.Boolean). Because when using scala type I get an error:

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That is dissapear when I change to java type:

enter image description here

But I dont want to typing all variable with scala Boolean sepecification to java.lang.Boolean because that too long. Whereas scala IDE automatically assume variabel declared with Boolean is a scala type. I mean is there any shortcut for this. For example in python there are something like import A.B.C as initial1. Or Is possible to change default variable declaration from scala type to java type in eclipse IDE.

And then why that error occur? I write this snippet:

object CompatibleTest extends App{

  println("test compatible")

  val m = new java.lang.Boolean(true)

  if(m.isInstanceOf[Boolean]) println("yes... ")

}

that indicate both java.lang.Boolean and scala Boolean are the same type.

Upvotes: 0

Views: 65

Answers (1)

Rex Kerr
Rex Kerr

Reputation: 167901

You can

import java.lang.{Boolean => jBoolean}

to save typing. Shadowing the Scala Boolean with Java's is not likely to work out well for you.

Note also that Scala boxes its Boolean (which is Java's primitive boolean) into java.lang.Boolean in generic code and a few other contexts, including isInstanceOf tests.

Upvotes: 1

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