Listing 5 shows the implementation file for the MegaLottery class.
清单5显示了megalottery类的实现文件。
Listing 7 shows the implementation file for the LotteryFactory class.
清单7显示了LotteryFactory类的实现文件。
The following sections of the implementation file are significant for the sample widget.
实现文件的以下部分对示例小部件非常重要。
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