Java Gossip: Logger 階層關係

• LoggerHierarchyDemo.java

package onlyfun.caterpillar;
 
import java.util.logging.*;

public class LoggerHierarchyDemo {
    public static void main(String[] args) {
        Logger loggerOnlyfun = Logger.getLogger("onlyfun");
        Logger loggerCaterpillar = 
                     Logger.getLogger("onlyfun.caterpillar");

        System.out.println(loggerOnlyfun.getParent());
        System.out.println(
                   loggerCaterpillar.getParent().getName());
        System.out.println(loggerCaterpillar.getName());
        
        loggerOnlyfun.setLevel(Level.WARNING);
        loggerCaterpillar.info("caterpillar' info");
        
        loggerCaterpillar.setLevel(Level.INFO);
        loggerCaterpillar.info("caterpillar' info");
    }
}