code: public DescribeDBInstancesResult withDBInstances(DBInstance... dBInstances) {
          if (this.dBInstances == null) {
              setDBInstances(new com.amazonaws.internal.SdkInternalList<DBInstance>(dBInstances.length));
          }
          for (DBInstance ele : dBInstances) {
              this.dBInstances.add(ele);
          }
          return this;
      }
docs: <p>
  A list of <a>DBInstance</a> instances.
  </p>
  <p>
  <b>NOTE:</b> This method appends the values to the existing list (if any). Use
  {@link #setDBInstances(java.util.Collection)} or {@link #withDBInstances(java.util.Collection)} if you want to
  override the existing values.
  </p>
  
  @param dBInstances
  A list of <a>DBInstance</a> instances.
  @return Returns a reference to this object so that method calls can be chained together.