Prefer scala.Serializable to j.io.Serializable

The former extends the latter, and exists as a platorm agnostic
serialization marker trait. It is of less value now that we
have jettisoned the MSIL backend, but while it still exists
we ought ought to use it.

I achieved this by replacing wildcard import of `java.io._`
with selective imports, leaving `Serializable` to bind to
`scala.Serializable`.

3 files changed, 4 insertions, 4 deletions

diff --git a/src/library/scala/collection/immutable/List.scala b/src/library/scala/collection/immutable/List.scala
index aa9dec2761..a8f1149615 100644
--- a/src/library/scala/collection/immutable/List.scala
+++ b/src/library/scala/collection/immutable/List.scala
@@ -13,7 +13,7 @@ package immutable
 import generic._
 import mutable.{Builder, ListBuffer}
 import scala.annotation.tailrec
-import java.io._
+import java.io.{ObjectOutputStream, ObjectInputStream}
 
 /** A class for immutable linked lists representing ordered collections
  *  of elements of type.
@@ -85,7 +85,7 @@ sealed abstract class List[+A] extends AbstractSeq[A]
                                   with Product
                                   with GenericTraversableTemplate[A, List]
                                   with LinearSeqOptimized[A, List[A]]
-                                  with Serializable {
+                                  with scala.Serializable {
   override def companion: GenericCompanion[List] = List
 
   import scala.collection.{Iterable, Traversable, Seq, IndexedSeq}
diff --git a/src/library/scala/collection/immutable/PagedSeq.scala b/src/library/scala/collection/immutable/PagedSeq.scala
index 3a64820be6..fb9f6703a9 100644
--- a/src/library/scala/collection/immutable/PagedSeq.scala
+++ b/src/library/scala/collection/immutable/PagedSeq.scala
@@ -12,7 +12,7 @@ package scala
 package collection
 package immutable
 
-import java.io._
+import java.io.{File, FileReader, Reader}
 import scala.util.matching.Regex
 import scala.reflect.ClassTag
 
diff --git a/src/library/scala/collection/mutable/ListBuffer.scala b/src/library/scala/collection/mutable/ListBuffer.scala
index 5e838d0d88..d6a4d92139 100644
--- a/src/library/scala/collection/mutable/ListBuffer.scala
+++ b/src/library/scala/collection/mutable/ListBuffer.scala
@@ -12,7 +12,7 @@ package mutable
 
 import generic._
 import immutable.{List, Nil, ::}
-import java.io._
+import java.io.{ObjectOutputStream, ObjectInputStream}
 import scala.annotation.migration
 
 /** A `Buffer` implementation back up by a list. It provides constant time