CODEWITHSUNDEEP
scala
candleford
candleford

Reputation: 251

Java to Scala conversion

I'm trying to convert the following Java code into Scala:

ImageRecognitionPlugin imageRecognition = (ImageRecognitionPlugin)nnet.getPlugin(ImageRecognitionPlugin.class)

It runs in Java (full code: http://neuroph.sourceforge.net/image_recognition.html).

What would it be in Scala? I'm confused about the "(ImageRecognitionPlugin).nnet" bit and I get the following error when I drop the "(ImageRecognitionPlugin)".

"error: object ImageRecognitionPlugin is not a value"

Upvotes: 0

Views: 318

Answers (2)

Ryan
Ryan

Reputation: 7257

Try this:

val imageRecognition:ImageRecognitionPlugin = 
    nnet.getPlugin(classOf[ImageRecognitionPlugin])

Let's break this down:

val

This declares an immutable value. That means that this value will always point to this specific instance. If you used a var instead this would be a variable instead.

imageRecognition:ImageRecognitionPlugin

This tells us 1) the name of the value and 2) its type. Instead of Foo aFoo, as in Java, Scala uses aFoo:Foo.

nnet.getPlugin(classOf[ImageRecognitionPlugin])

classOf[Foo] is Scala's equivalent of Foo.class in Java.

Upvotes: 1

Chris Shain
Chris Shain

Reputation: 51369

In scala you need to specify whether you are create a mutable (var) or immutable (val) variable. You also need to use classOf and instanceOf instead of .class and the (cast):

val imageRecognition = nnet.getPlugin(classOf[ImageRecognitionPlugin]).asInstanceOf[ImageRecognitionPlugin]

Upvotes: 4

Related Questions