code: public DescribeStacksResult withStacks(Stack... stacks) {
          if (this.stacks == null) {
              setStacks(new java.util.ArrayList<Stack>(stacks.length));
          }
          for (Stack ele : stacks) {
              this.stacks.add(ele);
          }
          return this;
      }
docs: <p>
  Information about the stacks.
  </p>
  <p>
  <b>NOTE:</b> This method appends the values to the existing list (if any). Use
  {@link #setStacks(java.util.Collection)} or {@link #withStacks(java.util.Collection)} if you want to override the
  existing values.
  </p>
  
  @param stacks
  Information about the stacks.
  @return Returns a reference to this object so that method calls can be chained together.