diff -r aade36e70da0 -r e2bf17cee34b jdk/src/share/classes/javax/sound/sampled/DataLine.java
--- a/jdk/src/share/classes/javax/sound/sampled/DataLine.java	Wed Jun 11 10:53:27 2014 +0400
+++ b/jdk/src/share/classes/javax/sound/sampled/DataLine.java	Wed Jun 18 13:14:15 2014 -0700
@@ -470,23 +470,23 @@
         @Override
         public String toString() {
 
-            StringBuffer buf = new StringBuffer();
+            StringBuilder sb = new StringBuilder();
 
             if ( (formats.length == 1) && (formats[0] != null) ) {
-                buf.append(" supporting format " + formats[0]);
+                sb.append(" supporting format " + formats[0]);
             } else if (getFormats().length > 1) {
-                buf.append(" supporting " + getFormats().length + " audio formats");
+                sb.append(" supporting " + getFormats().length + " audio formats");
             }
 
             if ( (minBufferSize != AudioSystem.NOT_SPECIFIED) && (maxBufferSize != AudioSystem.NOT_SPECIFIED) ) {
-                buf.append(", and buffers of " + minBufferSize + " to " + maxBufferSize + " bytes");
+                sb.append(", and buffers of " + minBufferSize + " to " + maxBufferSize + " bytes");
             } else if ( (minBufferSize != AudioSystem.NOT_SPECIFIED) && (minBufferSize > 0) ) {
-                buf.append(", and buffers of at least " + minBufferSize + " bytes");
+                sb.append(", and buffers of at least " + minBufferSize + " bytes");
             } else if (maxBufferSize != AudioSystem.NOT_SPECIFIED) {
-                buf.append(", and buffers of up to " + minBufferSize + " bytes");
+                sb.append(", and buffers of up to " + minBufferSize + " bytes");
             }
 
-            return new String(super.toString() + buf);
+            return new String(super.toString() + sb);
         }
     }
 }