Java tutorial
import java.util.logging.Level; import java.util.logging.Logger; public class MainClass { private static Logger lgr = Logger.getLogger("com"), lgr2 = Logger.getLogger("com.java2s"), util = Logger.getLogger("com.java2s.util"), test = Logger.getLogger("com.java2s.test"), rand = Logger.getLogger("random"); private static void logMessages() { lgr.info("com : info"); lgr2.info("com.bruceeckel : info"); util.info("util : info"); test.severe("test : severe"); rand.info("random : info"); } public static void main(String[] args) { lgr.setLevel(Level.SEVERE); System.out.println("com level: SEVERE"); logMessages(); util.setLevel(Level.FINEST); test.setLevel(Level.FINEST); rand.setLevel(Level.FINEST); System.out.println("individual loggers set to FINEST"); logMessages(); lgr.setLevel(Level.SEVERE); System.out.println("com level: SEVERE"); logMessages(); } }