code: public DBInstance withDBParameterGroups(DBParameterGroupStatus... dBParameterGroups) {
          if (this.dBParameterGroups == null) {
              setDBParameterGroups(new java.util.ArrayList<DBParameterGroupStatus>(dBParameterGroups.length));
          }
          for (DBParameterGroupStatus ele : dBParameterGroups) {
              this.dBParameterGroups.add(ele);
          }
          return this;
      }
docs: <p>
  Provides the list of DB parameter groups applied to this DB instance.
  </p>
  <p>
  <b>NOTE:</b> This method appends the values to the existing list (if any). Use
  {@link #setDBParameterGroups(java.util.Collection)} or {@link #withDBParameterGroups(java.util.Collection)} if
  you want to override the existing values.
  </p>
  
  @param dBParameterGroups
  Provides the list of DB parameter groups applied to this DB instance.
  @return Returns a reference to this object so that method calls can be chained together.