The custom Handler created here is of type LoggingWindowHandler, with its definition in Listing 5.
这里创建的定制Handler的类型为LoggingWindowHandler ，该类型的定义在清单5 中。
The custom Handler created here is of type LoggingWindowHandler, with its definition in Listing 5.
这里创建的定制Handler的类型为LoggingWindowHandler ，该类型的定义在清单5 中。
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