Logger Hierarchy

By using the name given to your logger, you can make a hierarchy.

For Example:

import java.util.logging.*;

public class LogHierarchy {
    public static void main(String args[]){
        Logger lev1 = Logger.getLogger("Level1");
        Logger lev2 = Logger.getLogger("Level1.Level2");
        Logger lev3 = Logger.getLogger("Level1.Level2.Level3");
        
        System.out.println(lev3.getParent().getName());
        System.out.println(lev3.getParent().getParent().getName());
        System.out.println(lev3.getParent().getParent().getParent().getName());
    }
}

Output

Level1.Level2
Level1

Logger.getLogger("Level1.Level2.Level3")

Each '.' in the name marks a level in the hierarchy.

getParent() return the parent for this Logger. Parent loggers should be created in the hierarchy, other wise getParent return empty string.

Example

import java.util.logging.*;

public class LogHierarchy {
    public static void main(String args[]){
        Logger lev3 = Logger.getLogger("Level1.Level2.Level3");
        System.out.println(lev3.getParent().getName());
    }
}

In the above program, loggers with name 'Level1' and 'Level1.Level2' are not created. So getParent() returns empty string.

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