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

rev 52979 : 8215281: Use String.isEmpty() when applicable in java.base
Reviewed-by: TBD

@@ -401,11 +401,11 @@
      * @see     ProcessBuilder
      * @since 1.3
      */
     public Process exec(String command, String[] envp, File dir)
         throws IOException {
-        if (command.length() == 0)
+        if (command.isEmpty())
             throw new IllegalArgumentException("Empty command");
 
         StringTokenizer st = new StringTokenizer(command);
         String[] cmdarray = new String[st.countTokens()];
         for (int i = 0; st.hasMoreTokens(); i++)