e390. preventing a logger from forwarding log records to its parent.txt

这里面包含了一百多个JAVA源文件

By default, a logger sends a log record not only to its handlers but to all the handlers of ancestor loggers. If the effects of the parent handlers are not desired, it is necessary to prevent log records from being forwarded to the parent. 
This example demonstrates how to stop a logger from sending log records to its parent. 

Note: Although the level of a log record is tested against the logger's log level, this test is not done with any of the logger's parents. However, the log level of all handlers is still in effect. 

    // Get a logger
    Logger logger = Logger.getLogger("com.mycompany");
    
    // Stop forwarding log records to ancestor handlers
    logger.setUseParentHandlers(false);
    
    // Start forwarding log records to ancestor handlers
    logger.setUseParentHandlers(true);

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