src/java.base/share/classes/java/lang/Long.java

rev 51919 : 8215281: Use String.isEmpty() when applicable in java.base
Reviewed-by: dfuchs, alanb

@@ -1227,11 +1227,11 @@
         int radix = 10;
         int index = 0;
         boolean negative = false;
         Long result;
 
-        if (nm.length() == 0)
+        if (nm.isEmpty())
             throw new NumberFormatException("Zero length string");
         char firstChar = nm.charAt(0);
         // Handle sign, if present
         if (firstChar == '-') {
             negative = true;