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                # 封裝 Encapsulation - 使一個類的變量 private - 提供 public 方法來調用這些變量. 所以外部類是進不去的. 這些變量被隱藏在類里了. 只能通過已經定義的 pulic 方法調用. **好處** 當我們修改我們的實現的代碼時, 不會破壞其他調用我們這部分代碼的代碼.可維護性,靈活性和可擴展
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