Prefer StringBuilder over StringBuffer

The former requires unneeded synchronization.  Found via error-prone.

1 files changed, 1 insertions, 1 deletions

diff --git a/org.fox.ttrss/src/main/java/org/fox/ttrss/util/ImageCacheService.java b/org.fox.ttrss/src/main/java/org/fox/ttrss/util/ImageCacheService.java
index f07e23c2..24a7a732 100755
--- a/org.fox.ttrss/src/main/java/org/fox/ttrss/util/ImageCacheService.java
+++ b/org.fox.ttrss/src/main/java/org/fox/ttrss/util/ImageCacheService.java
@@ -132,7 +132,7 @@ public class ImageCacheService extends IntentService {
 	        digest.update(s.getBytes());
 	        byte messageDigest[] = digest.digest();
 	        
-	        StringBuffer hexString = new StringBuffer();
+	        StringBuilder hexString = new StringBuilder();
 	        for (int i=0; i<messageDigest.length; i++)
 	            hexString.append(Integer.toHexString(0xFF & messageDigest[i]));