e386. determining if a message will be logged.txt

这里面包含了一百多个JAVA源文件

See also e389 Minimizing the Impact of Logging Code. 
    Logger logger = Logger.getLogger("com.mycompany.MyClass");
    
    // Check if the message will be logged
    if (logger.isLoggable(Level.FINEST)) {
        logger.finest("my finest message");
    }