src/java.desktop/share/classes/javax/sound/sampled/AudioFileFormat.java

@@ -98,26 +98,26 @@
 public class AudioFileFormat {
 
     /**
      * File type.
      */
-    private Type type;
+    private final Type type;
 
     /**
      * File length in bytes.
      */
-    private int byteLength;
+    private final int byteLength;
 
     /**
      * Format of the audio data contained in the file.
      */
-    private AudioFormat format;
+    private final AudioFormat format;
 
     /**
      * Audio data length in sample frames.
      */
-    private int frameLength;
+    private final int frameLength;
 
     /**
      * The set of properties.
      */
     private HashMap<String, Object> properties;

@@ -174,11 +174,11 @@
      * @since 1.5
      */
     public AudioFileFormat(Type type, AudioFormat format,
                            int frameLength, Map<String, Object> properties) {
         this(type,AudioSystem.NOT_SPECIFIED,format,frameLength);
-        this.properties = new HashMap<String, Object>(properties);
+        this.properties = new HashMap<>(properties);
     }
 
     /**
      * Obtains the audio file type, such as {@code WAVE} or {@code AU}.
      *