code: public DescribeScalingPoliciesRequest withPolicyNames(String... policyNames) {
          if (this.policyNames == null) {
              setPolicyNames(new java.util.ArrayList<String>(policyNames.length));
          }
          for (String ele : policyNames) {
              this.policyNames.add(ele);
          }
          return this;
      }
docs: <p>
  The names of the scaling policies to describe.
  </p>
  <p>
  <b>NOTE:</b> This method appends the values to the existing list (if any). Use
  {@link #setPolicyNames(java.util.Collection)} or {@link #withPolicyNames(java.util.Collection)} if you want to
  override the existing values.
  </p>
  
  @param policyNames
  The names of the scaling policies to describe.
  @return Returns a reference to this object so that method calls can be chained together.