gistfile1.txt

% scala
Welcome to Scala version 2.10.0.r25823-b20111011192940 (Java HotSpot(TM) 64-Bit Server VM, Java 1.6.0_26).
Type in expressions to have them evaluated.
Type :help for more information.

scala> class Bippy extends java.util.Collection[Int]
<console>:7: error: class Bippy is missing 13 methods:
As seen from class Bippy, the missing method signatures are as follows.
(For convenience, these are usable as stub implementations.)

  def add(x$1: Int): Boolean = ???
  def addAll(x$1: java.util.Collection[_ <: Int]): Boolean = ???
  def clear(): Unit = ???
  def contains(x$1: Any): Boolean = ???
  def containsAll(x$1: java.util.Collection[_]): Boolean = ???
  def isEmpty(): Boolean = ???
  def iterator(): java.util.Iterator[Int] = ???
  def remove(x$1: Any): Boolean = ???
  def removeAll(x$1: java.util.Collection[_]): Boolean = ???
  def retainAll(x$1: java.util.Collection[_]): Boolean = ???
  def size(): Int = ???
  def toArray(): Array[Object] = ???
  def toArray[T](x$1: Array[T with Object]): Array[T with Object] = ???

       class Bippy extends java.util.Collection[Int]
             ^

scala> :paste
// Entering paste mode (ctrl-D to finish)

class Bippy extends java.util.Collection[Int] {
  def add(x$1: Int): Boolean = ???
  def addAll(x$1: java.util.Collection[_ <: Int]): Boolean = ???
  def clear(): Unit = ???
  def contains(x$1: Any): Boolean = ???
  def containsAll(x$1: java.util.Collection[_]): Boolean = ???
  def isEmpty(): Boolean = ???
  def iterator(): java.util.Iterator[Int] = ???
  def remove(x$1: Any): Boolean = ???
  def removeAll(x$1: java.util.Collection[_]): Boolean = ???
  def retainAll(x$1: java.util.Collection[_]): Boolean = ???
  def size(): Int = ???
  def toArray(): Array[Object] = ???
  def toArray[T](x$1: Array[T with Object]): Array[T with Object] = ???
}

// Exiting paste mode, now interpreting.

defined class Bippy

scala> new Bippy
res0: Bippy = Bippy@76e86c03