Here is an example of how the Loader class from the logback library can be used:

import ch.qos.logback.core.util.Loader;

public class MyClass {
    public static void main(String[] args) {
        ClassLoader classLoader = Loader.getClassLoaderOfObject(new MyClass());
        System.out.println("Class loader: " + classLoader);
    }
}

In this example, MyClass uses an instance of Loader to get the ClassLoader of the current class (MyClass). The getClassLoaderOfObject method takes an object as an argument and returns the ClassLoader that loaded the class of that object.

You can also use getClassLoader to get the class loader of the current class.

ClassLoader classLoader = Loader.getClassLoader();

You can also use getResource to get the resource.

URL resource = Loader.getResource("logback.xml", MyClass.class);

This will return the URL of the resource "logback.xml" in the same package as the class "MyClass"

You can also use getResourceAsURL to get resource as URL.

URL url = Loader.getResourceAsURL("logback.xml", MyClass.class);

This will return the URL of the resource "logback.xml" in the same package as the class "MyClass"

Please note that Loader is a utility class and it does not have any constructor.