public ImageResponseCard withButtons(Button... buttons) {
        if (this.buttons == null) {
            setButtons(new java.util.ArrayList<Button>(buttons.length));
        }
        for (Button ele : buttons) {
            this.buttons.add(ele);
        }
        return this;
    }
<p>
A list of buttons that should be displayed on the response card. The arrangement of the buttons is determined by
the platform that displays the button.
</p>
<p>
<b>NOTE:</b> This method appends the values to the existing list (if any). Use
{@link #setButtons(java.util.Collection)} or {@link #withButtons(java.util.Collection)} if you want to override
the existing values.
</p>

@param buttons
       A list of buttons that should be displayed on the response card. The arrangement of the buttons is
       determined by the platform that displays the button.
@return Returns a reference to this object so that method calls can be chained together.
aws-java-sdk-lexruntimev2/src/main/java/com/amazonaws/services/lexruntimev2/model/ImageResponseCard.java