Log4J log levels

import org.apache.log4j.*;

public class LogClass {
   private static org.apache.log4j.Logger log = Logger.getLogger(LogClass.class);
   
   public static void main(String[] args) {
      log.setLevel(Level.WARN);

      log.trace("Trace Message!");
      log.debug("Debug Message!");
      log.info("Info Message!"); <-- not this or any of the above lines
      log.warn("Warn Message!"); <-- will log this line
      log.error("Error Message!"); <-- and this
      log.fatal("Fatal Message!"); <-- and this
   }
}