---
layout: pattern
title: Private Class Data
folder: private-class-data
permalink: /patterns/private-class-data/
categories: Idiom
tags:
 - Data access
---

## Intent
Private Class Data design pattern seeks to reduce exposure of
attributes by limiting their visibility. It reduces the number of class
attributes by encapsulating them in single Data object.

## Class diagram
![alt text](./etc/private-class-data.png "Private Class Data")

## Applicability
Use the Private Class Data pattern when

* You want to prevent write access to class data members