Scala types with java classes

JavaClass.java

  public class JavaClass {
    public String toString() {
      return ""
    }

    public boolean getBool() {
      return false
    }
  }

test.scala

  type WrongType = {

    def toString: String

    def getBool: Boolean
  }

  type RightType = {

    def toString: String

    def getBool(): Boolean
  }

  def testRight(x: RightType) {
    //
  }

  def testWrong(x: WrongType) {
    //
  }

  testRight(new JavaClass()) // COMPILES
  testWrong(new JavaClass()) // DOESN'T COMPILE