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Generate KeyStore and signed applet
in command line:
keytool -genkey -keystore myKeystore -alias myself 
//建立你的public key 
 
keytool -selfcert -alias myself -keystore myKeystore 
//由你的pubilc key 建立一個 private key 
 
jarsigner -keystore myKeystore test.jar myself 
//將你的jar檔用你的private key來簽章