--- a/src/java.base/unix/classes/java/io/UnixFileSystem.java	Thu Dec 13 16:14:07 2018 +0100
+++ b/src/java.base/unix/classes/java/io/UnixFileSystem.java	Thu Dec 13 15:31:05 2018 +0100
@@ -98,7 +98,7 @@
     }
 
     public int prefixLength(String pathname) {
-        if (pathname.length() == 0) return 0;
+        if (pathname.isEmpty()) return 0;
         return (pathname.charAt(0) == '/') ? 1 : 0;
     }
 
@@ -249,7 +249,7 @@
     public int getBooleanAttributes(File f) {
         int rv = getBooleanAttributes0(f);
         String name = f.getName();
-        boolean hidden = (name.length() > 0) && (name.charAt(0) == '.');
+        boolean hidden = !name.isEmpty() && name.charAt(0) == '.';
         return rv | (hidden ? BA_HIDDEN : 0);
     }