code: public ListMFADevicesResult withMFADevices(MFADevice... mFADevices) {
          if (this.mFADevices == null) {
              setMFADevices(new com.amazonaws.internal.SdkInternalList<MFADevice>(mFADevices.length));
          }
          for (MFADevice ele : mFADevices) {
              this.mFADevices.add(ele);
          }
          return this;
      }
docs: <p>
  A list of MFA devices.
  </p>
  <p>
  <b>NOTE:</b> This method appends the values to the existing list (if any). Use
  {@link #setMFADevices(java.util.Collection)} or {@link #withMFADevices(java.util.Collection)} if you want to
  override the existing values.
  </p>
  
  @param mFADevices
  A list of MFA devices.
  @return Returns a reference to this object so that method calls can be chained together.