code: public UpdateUserPoolClientRequest withReadAttributes(String... readAttributes) {
          if (this.readAttributes == null) {
              setReadAttributes(new java.util.ArrayList<String>(readAttributes.length));
          }
          for (String ele : readAttributes) {
              this.readAttributes.add(ele);
          }
          return this;
      }
docs: <p>
  The read-only attributes of the user pool.
  </p>
  <p>
  <b>NOTE:</b> This method appends the values to the existing list (if any). Use
  {@link #setReadAttributes(java.util.Collection)} or {@link #withReadAttributes(java.util.Collection)} if you want
  to override the existing values.
  </p>
  
  @param readAttributes
  The read-only attributes of the user pool.
  @return Returns a reference to this object so that method calls can be chained together.