How to find the package name given a class name?

Question

Given a class name as a string, how do I get the package name of it at run time ? I do not have the fully qualified name with package name + class name. Simply only the clas

Answer 1

 final Package[] packages = Package.getPackages();
    final String className = "ArrayList";

    for (final Package p : packages) {
        final String pack = p.getName();
        final String tentative = pack + "." + className;
        try {
            Class.forName(tentative);
        } catch (final ClassNotFoundException e) {
            continue;
        }
        System.out.println(pack);
        break;
    }