e396. getting the log level of a logger.txt

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The log level of a logger controls how severe a log record must be before the logger accepts it. In particular, a log record whose level is greater than or equal to the logger's log level is logged. 
A log level can be null, in which case the level is inherited from the logger's parent. 

This example implements a method that returns the level of a logger. If the level is null, the method looks for an ancestor with a non-null level. 

    // Return the level of the specified logger.
    // If the level of logger is null, the level of the closest
    // ancestor with a non-null level is returned.
    public static Level getLevel(Logger logger) {
        Level level = logger.getLevel();
        while (level == null && logger.getParent() != null) {
            logger = logger.getParent();
            level = logger.getLevel();
        }
        return level;
     }

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