code: public DescribePoliciesRequest withPolicyTypes(String... policyTypes) {
          if (this.policyTypes == null) {
              setPolicyTypes(new com.amazonaws.internal.SdkInternalList<String>(policyTypes.length));
          }
          for (String ele : policyTypes) {
              this.policyTypes.add(ele);
          }
          return this;
      }
docs: <p>
  One or more policy types. The valid values are <code>SimpleScaling</code>, <code>StepScaling</code>, and
  <code>TargetTrackingScaling</code>.
  </p>
  <p>
  <b>NOTE:</b> This method appends the values to the existing list (if any). Use
  {@link #setPolicyTypes(java.util.Collection)} or {@link #withPolicyTypes(java.util.Collection)} if you want to
  override the existing values.
  </p>
  
  @param policyTypes
  One or more policy types. The valid values are <code>SimpleScaling</code>, <code>StepScaling</code>, and
  <code>TargetTrackingScaling</code>.
  @return Returns a reference to this object so that method calls can be chained together.