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

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

*** 401,411 ****
       * @see     ProcessBuilder
       * @since 1.3
       */
      public Process exec(String command, String[] envp, File dir)
          throws IOException {
!         if (command.length() == 0)
              throw new IllegalArgumentException("Empty command");
  
          StringTokenizer st = new StringTokenizer(command);
          String[] cmdarray = new String[st.countTokens()];
          for (int i = 0; st.hasMoreTokens(); i++)
--- 401,411 ----
       * @see     ProcessBuilder
       * @since 1.3
       */
      public Process exec(String command, String[] envp, File dir)
          throws IOException {
!         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++)