* javax/sound/sampled/AudioSystem.java (getAudioFileFormat): New

	constructor.
	* javax/sound/sampled/FloatControl.java: Now abstract.
	* javax/sound/sampled/EnumControl.java: Now abstract.
	* javax/sound/sampled/CompoundControl.java: Now abstract.
	* javax/sound/sampled/BooleanControl.java: Now abstract.

5 files changed, 9 insertions, 4 deletions

diff --git a/javax/sound/sampled/AudioSystem.java b/javax/sound/sampled/AudioSystem.java
index 0b0b754b5..2f64f92c5 100644
--- a/javax/sound/sampled/AudioSystem.java
+++ b/javax/sound/sampled/AudioSystem.java
@@ -68,6 +68,11 @@ public class AudioSystem
    */
   public static final int NOT_SPECIFIED = -1;
 
+  // This class is not instantiable.
+  private AudioSystem()
+  {
+  }
+
   /**
    * Return the file format of a given File.
    * @param f the file to check
diff --git a/javax/sound/sampled/BooleanControl.java b/javax/sound/sampled/BooleanControl.java
index aae1e23a2..147a7f8b0 100644
--- a/javax/sound/sampled/BooleanControl.java
+++ b/javax/sound/sampled/BooleanControl.java
@@ -42,7 +42,7 @@ package javax.sound.sampled;
  * A BooleanControl is a Control which has two states.
  * @since 1.3
  */
-public class BooleanControl extends Control
+public abstract class BooleanControl extends Control
 {
   /**
    * A Type specialized to represent a boolean control.
diff --git a/javax/sound/sampled/CompoundControl.java b/javax/sound/sampled/CompoundControl.java
index 8664abca8..057bdfd72 100644
--- a/javax/sound/sampled/CompoundControl.java
+++ b/javax/sound/sampled/CompoundControl.java
@@ -42,7 +42,7 @@ package javax.sound.sampled;
  * A compound control provides control over several other controls.
  * @since 1.3
  */
-public class CompoundControl extends Control
+public abstract class CompoundControl extends Control
 {
   /**
    * This describes a single compound control.
diff --git a/javax/sound/sampled/EnumControl.java b/javax/sound/sampled/EnumControl.java
index 798f3a91c..1ddc8a9a8 100644
--- a/javax/sound/sampled/EnumControl.java
+++ b/javax/sound/sampled/EnumControl.java
@@ -43,7 +43,7 @@ package javax.sound.sampled;
  * values. 
  * @since 1.3
  */
-public class EnumControl extends Control
+public abstract class EnumControl extends Control
 {
   /**
    * This Type describes an EnumControl.
diff --git a/javax/sound/sampled/FloatControl.java b/javax/sound/sampled/FloatControl.java
index 409c90de2..bbdb24bab 100644
--- a/javax/sound/sampled/FloatControl.java
+++ b/javax/sound/sampled/FloatControl.java
@@ -39,7 +39,7 @@ exception statement from your version. */
 package javax.sound.sampled;
 
 /** @since 1.3 */
-public class FloatControl extends Control
+public abstract class FloatControl extends Control
 {
   /**
    * An instance of this class describes a particular floating point control.