import org.apache.log4j.Logger;public class InnerClassLogger {    static Logger loggerA = Logger.getLogger(InnerClassLogger.class);        public static void main(String[] args) {        loggerA.info(new Object(){            @Override            public String toString(){                loggerA.info("loggerB");                return "";            }        });    }}

输出：

0    [main] INFO  InnerClassLogger  - loggerB0    [main] INFO  InnerClassLogger  - loggerB