caused by: java.lang.ClassNotFoundException: Exemplo01
at java.net.URLClassLoader$1.run<Unknown Source>
at java.security.AcessController.doPrivileged<Native Method>
at java.net.URLClassLoader.findClass<Unknown Source>
at java.Lang.ClassLoader.loadClass<Unknown Source>
at sun.misc.Launcher$AppClassLoader.loadClass<Unknown Source>
at java.lang.ClassLoader.loadClass<Unknown Source>
at java.lang.ClassLoaderInternal<Unknown Source>
gera o codigo .class mas aparece esta mensagem o que devo fazer