code: public UpdateAccountResult withFeatures(String... features) {
          if (this.features == null) {
              setFeatures(new java.util.ArrayList<String>(features.length));
          }
          for (String ele : features) {
              this.features.add(ele);
          }
          return this;
      }
docs: <p>
  A list of features supported for the account. When usage plans are enabled, the features list will include an
  entry of <code>"UsagePlans"</code>.
  </p>
  <p>
  <b>NOTE:</b> This method appends the values to the existing list (if any). Use
  {@link #setFeatures(java.util.Collection)} or {@link #withFeatures(java.util.Collection)} if you want to override
  the existing values.
  </p>
  
  @param features
  A list of features supported for the account. When usage plans are enabled, the features list will include
  an entry of <code>"UsagePlans"</code>.
  @return Returns a reference to this object so that method calls can be chained together.