--- a/src/java.base/share/classes/java/net/URLDecoder.java	Thu Dec 13 16:14:07 2018 +0100
+++ b/src/java.base/share/classes/java/net/URLDecoder.java	Thu Dec 13 15:31:05 2018 +0100
@@ -133,7 +133,7 @@
      * @since 1.4
      */
     public static String decode(String s, String enc) throws UnsupportedEncodingException {
-        if (enc.length() == 0) {
+        if (enc.isEmpty()) {
             throw new UnsupportedEncodingException ("URLDecoder: empty string enc parameter");
         }