Recently I have an applet to make a signature, so many information is found online, and now I have summarized as follows:
Signature in instead
Keytool -Genkey -Keyalg RSA -AAS keytool -export -alias -file anyfilename.crt jar cvf jarname.jar applet.class jarsigner jarname.jar
After each time you modify the Applet, you must 3, 4 steps for Applete Class.