This indicates that the BankAccount class is an abstract class and the withdrawal method is an abstract operation.

这表示，BankAccount类是一个抽象类，而withdrawal方法是抽象的操作。

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These are the respective implementations of each abstract class and interface in the message queue framework interface package.

它们分别是消息队列框架接口包中每个抽象类和接口的实现。

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Declare an inner class, Collab that extends the RuntimeCollaborator abstract class, and implements the operations and attributes declared for the MBean in the MBean Descriptor (Figure 2).

声明内部类Collab,Collab继承了RuntimeCollaborator抽象类并实现了在MBean描述符中为MBean声明的操作和属性(图2)。

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Declare an inner class, Collab that extends the RuntimeCollaborator abstract class, and implements the operations and attributes declared for the MBean in the MBean Descriptor (Figure 2).

声明内部类Collab,Collab继承了RuntimeCollaborator抽象类并实现了在MBean描述符中为MBean声明的操作和属性(图2)。

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