用uml画出atm原理图

以下是一个简单的ATM原理图的UML类图：

+--------------+
|     ATM      |
+--------------+
| -cardReader  |
| -cashDispenser|
| -keypad      |
| -screen      |
+--------------+
| +insertCard()|
| +enterPin()  |
| +selectAmount() |
| +dispenseCash() |
+--------------+

+------------------+
|    CardReader    |
+------------------+
| -card            |
+------------------+
| +insertCard()    |
| +readCard()      |
+------------------+

+------------------+
|   CashDispenser  |
+------------------+
| -cash            |
+------------------+
| +dispenseCash()  |
| +addCash()       |
+------------------+

+---------------+
|    Keypad     |
+---------------+
| -input        |
+---------------+
| +getInput()   |
+---------------+

+---------------+
|    Screen     |
+---------------+
| -output       |
+---------------+
| +display()    |
+---------------+

该类图包含ATM类及其四个组件：卡读取器、现金取款机、键盘和屏幕，每个组件都具有其自己的方法和属性。ATM类具有插入卡、输入密码、选择金额和取款等公共方法。