Find jars and classes

package test;

import java.io.File;
import java.io.IOException;
import java.util.Enumeration;
import java.util.jar.JarEntry;
import java.util.jar.JarFile;
import test.classtest.TestClass;

public class TestArea {
    public static void main (String args[]) throws IOException {
        ClassLoader loader = TestClass.class.getClassLoader();

        // find jar file of a class
        // method 1
        // ref http://stackoverflow.com/questions/1983839/determine-which-jar-file-a-class-is-from
        String name = TestClass.class.getName().replaceAll("\\.", "/") + ".class";
        System.out.println(loader.getResource(name));
        // method 2
        // ref http://stackoverflow.com/questions/4546632/how-to-determine-absolute-path-if-any-of-a-loaded-class
        String path = TestClass.class.getProtectionDomain().getCodeSource().getLocation().getPath();
        System.out.println(path);

        // find jars contain TestClass.class
        // ref http://stackoverflow.com/questions/9630268/read-contents-of-jar-file-given-specific-path
        File f = new File(path).getParentFile(); // WEB-INF/lib
        for (File jar : f.listFiles()) {
            String jarPath = jar.getAbsolutePath();
            JarFile jarFile = new JarFile(jarPath);
            for(Enumeration<JarEntry> em = jarFile.entries(); em.hasMoreElements();) {
                String s= em.nextElement().toString();
                if (s.endsWith("/TestClass.class")) {
                    System.out.println(jarPath + " contains TestClass.class");
                }
            }
        }
    }
}