Oracle JDBC 驱动程序始终尝试从占据列表中第一位置的 RAC 节点获取物理连接。
The Oracle JDBC driver always tries to obtain physical connections from the RAC node that occupies the first position in the list.
如果信号量不可用，它将被置为睡眠状态；如果向它传递了一个致命信号，则会将它从等待者列表中删除，并且需要响应此信号。
If the semaphore is not available, it's put to sleep; if a fatal signal is delivered to it, it would be removed from the waiters' list and would have to respond to the signal.
在列表控件中能够将条目从一个位置拖动到另一位置很重要，但它要求实现自动滚屏(参见第19章)。
Being able to drag items from one place to another in a list control is powerful, but it demands that auto-scrolling be implemented (see Chapter 19).
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