Question

If I define a Scala class:

 class X(i:Int) {
   println (i)
 }

How do I use this class in Java code?

[EDIT] Actually, my problem is slightly more complicated

I have an abstract class

 abstract class X(i:Int) {
   println (i)
   def hello(s:String):Unit
 }

I need to use this in Java code. Is it possible to do it easily?

[EDIT2] Consider the following code

 object B {
    case class C(i:Int)
 }
 abstract class X(i:Int) {
   println (i)
   def hello(a:B.C):Unit
 }

In this case, the following java code gives an error in Netbeans IDE but builds fine:

 public class Y extends X  {
    public void hello(B.C c) {
       System.out.println("here");
    }
    public Y(int i) {
       super(i);
    }
 }

The error I get is:

hello(B.C) in Y cannot override hello(B.C) in X; overridden method is static, final

Netbeans 6.8, Scala 2.8.

As of now I think the only solution is to ignore the NB errors.

Here is an image showing the exact error(s) I get:

Answer 1

The generated bytecode for your class will be identical to the Java definition:

abstract class X implements scala.ScalaObject {
  public X(int i) {
    System.out.println(i);
  }

  public abstract void hello(String s);

  //possibly other fields/methods mixed-in from ScalaObject
}

Use it exactly as you would for this equivalent Java; subclass and provide a concrete implementation of the hello method.