Code for listing classes present in a Jar file

package com.wordpress.narendrakadali.util;

import java.util.ArrayList;
import java.util.Enumeration;
import java.util.List;
import java.util.jar.JarEntry;
import java.util.jar.JarFile;

public class ListAllClassesInJar

	 * @param args
	 * @throws IOException
	public static void main(String[] args) throws IOException
		List classNames = new ArrayList();
		if (args.length > 0)
			JarFile jarFile = new JarFile(args[0]);
			Enumeration allEntries = jarFile.entries();
			while (allEntries.hasMoreElements())
				JarEntry entry = (JarEntry) allEntries.nextElement();
				String name = entry.getName();
				if (name.endsWith(".class"))
					classNames.add(name.replace(".class", "").replace("/", "."));

			System.out.println("Please enter the jar filename as argument");


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