classDiagram
  class BankAccount {
    +String owner
    -int balance
    +deposit(int amount) void
    +withdraw(int amount) bool
    -validate() bool
  }
---
+-----------------+    
| BankAccount     |    
+-----------------+    
| +owner: String  |    
| -balance: int   |    
+-----------------+    
| +deposit: void  |    
| +withdraw: bool |    
| -validate: bool |    
+-----------------+