code: public ModifyFpgaImageAttributeRequest withUserIds(String... userIds) {
          if (this.userIds == null) {
              setUserIds(new com.amazonaws.internal.SdkInternalList<String>(userIds.length));
          }
          for (String ele : userIds) {
              this.userIds.add(ele);
          }
          return this;
      }
docs: <p>
  The AWS account IDs. This parameter is valid only when modifying the <code>loadPermission</code> attribute.
  </p>
  <p>
  <b>NOTE:</b> This method appends the values to the existing list (if any). Use
  {@link #setUserIds(java.util.Collection)} or {@link #withUserIds(java.util.Collection)} if you want to override
  the existing values.
  </p>
  
  @param userIds
  The AWS account IDs. This parameter is valid only when modifying the <code>loadPermission</code>
  attribute.
  @return Returns a reference to this object so that method calls can be chained together.