@Override
    public boolean equals(Object in) {
        if (in instanceof Item) {
            Item that = (Item)in;
            return this.attributes.equals(that.attributes);
        } else {
            return false;
        }
    }
Returns this item as a pretty JSON string. Note all binary data will
become base-64 encoded in the resultant string.
aws-java-sdk-dynamodb/src/main/java/com/amazonaws/services/dynamodbv2/document/Item.java