It should have a method on it that returns the age as an integer.
Person对象上应该有一个方法，该方法可以用整数形式返回年龄。
For example, suppose you have a method that reads a file and formats the data.
例如，假设有一个读取文件并格式化相应数据的方法。
For example, a bank - account class might have a method to calculate a balance.
例如，一个银行帐号类可能具有一个计算余额的方法。
For example, a bank - account class might have a method to calculate a balance.
例如，一个银行帐号类可能具有一个计算余额的方法。
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