Apply some static code analysis recommendations

Fix a batch of code inspection recommendations generated by IntelliJ 14.1.5.

Categories of fix,

  Unnecessary public modifier in interface
  Replace filter+size with count
  Replace filter+nonEmpty with exists
  Replace filter+headOption with find
  Replace `if (x != null) Some(x) else None` with Option(x)
  Replace getOrElse null with orNull
  Drop redundant semicolons
  Replace anon fun with PF
  Replace anon fun with method

1 files changed, 3 insertions, 3 deletions

diff --git a/src/reflect/scala/reflect/internal/util/WeakHashSet.scala b/src/reflect/scala/reflect/internal/util/WeakHashSet.scala
index 3a7a7626fb..83d2a3453b 100644
--- a/src/reflect/scala/reflect/internal/util/WeakHashSet.scala
+++ b/src/reflect/scala/reflect/internal/util/WeakHashSet.scala
@@ -41,7 +41,7 @@ final class WeakHashSet[A <: AnyRef](val initialCapacity: Int, val loadFactor: D
    * power of two equal to or greater than the specified initial capacity
    */
   private def computeCapacity = {
-    if (initialCapacity < 0) throw new IllegalArgumentException("initial capacity cannot be less than 0");
+    if (initialCapacity < 0) throw new IllegalArgumentException("initial capacity cannot be less than 0")
     var candidate = 1
     while (candidate < initialCapacity) {
       candidate  *= 2
@@ -372,13 +372,13 @@ final class WeakHashSet[A <: AnyRef](val initialCapacity: Int, val loadFactor: D
      * Number of buckets that hold collisions. Useful for diagnosing performance issues.
      */
     def collisionBucketsCount: Int =
-      (table filter (entry => entry != null && entry.tail != null)).size
+      (table count (entry => entry != null && entry.tail != null))
 
     /**
      * Number of buckets that are occupied in this hash table.
      */
     def fullBucketsCount: Int =
-      (table filter (entry => entry != null)).size
+      (table count (entry => entry != null))
 
     /**
      *  Number of buckets in the table