code: public
    void setTarget(String value) {
      String v = value.trim();
  
      if (SYSTEM_OUT.equalsIgnoreCase(v)) {
        target = SYSTEM_OUT;
      } else if (SYSTEM_ERR.equalsIgnoreCase(v)) {
        target = SYSTEM_ERR;
      } else {
        targetWarn(value);
      }
    }
docs: Sets the value of the <b>Target</b> option. Recognized values
  are "System.out" and "System.err". Any other value will be
  ignored.