code: public void setPermittedFileTypes(java.util.Collection<String> permittedFileTypes) {
          if (permittedFileTypes == null) {
              this.permittedFileTypes = null;
              return;
          }
  
          this.permittedFileTypes = new com.amazonaws.internal.SdkInternalList<String>(permittedFileTypes);
      }
docs: <p>
  The permitted file types allowed for a solution stack.
  </p>
  
  @param permittedFileTypes
  The permitted file types allowed for a solution stack.