OnJava8-Examples/logging/LoggingLevels.java

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// logging/LoggingLevels.java
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// (c)2016 MindView LLC: see Copyright.txt
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// We make no guarantees that this code is fit for any purpose.
// Visit http://mindviewinc.com/Books/OnJava/ for more book information.
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// {ErrorOutputExpected}
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import java.util.logging.Level;
import java.util.logging.Logger;
public class LoggingLevels {
private static Logger
lgr = Logger.getLogger("com"),
lgr2 = Logger.getLogger("com.mindviewinc"),
util= Logger.getLogger("onjava"),
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test= Logger.getLogger("com.mindviewinc.test"),
rand = Logger.getLogger("random");
private static void logMessages() {
lgr.info("com : info");
lgr2.info("com.mindviewinc : 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();
}
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}
/* Output:
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com level: SEVERE
individual loggers set to FINEST
com level: SEVERE
___[ Error Output ]___
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INFO: util : info
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SEVERE: test : severe
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INFO: random : info
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INFO: util : info
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SEVERE: test : severe
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INFO: random : info
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INFO: util : info
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SEVERE: test : severe
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INFO: random : info
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___[ Error Output is Expected ]___
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*/