Beginners Java, some experiment to help students recently, feel a little trouble, hope everybody can comment

AESCipher.java
AESConstants.java
AESCrypt.java
AESKeyGenerator.java
AESParameters.java
AESWrapCipher.java
ai.java
ARCFOURCipher.java
BlockCipherParamsCore.java
BlowfishCipher.java
BlowfishConstants.java
BlowfishCrypt.java
BlowfishKeyGenerator.java
BlowfishParameters.java
CipherBlockChaining.java
CipherCore.java
CipherFeedback.java
CipherTextStealing.java
CipherWithWrappingSpi.java
ConstructKeys.java
CounterMode.java
DESCipher.java
DESConstants.java
DESCrypt.java
DESedeCipher.java
DESedeCrypt.java
DESedeKey.java
DESedeKeyFactory.java
DESedeKeyGenerator.java
DESedeParameters.java
DESedeWrapCipher.java
DESKey.java
DESKeyFactory.java
DESKeyGenerator.java
DESParameters.java
DHKeyAgreement.java
DHKeyFactory.java
DHKeyPairGenerator.java
DHParameterGenerator.java
DHParameters.java
DHPrivateKey.java
DHPublicKey.java
ElectronicCodeBook.java
EncryptedPrivateKeyInfo.java
FeedbackCipher.java
HmacCore.java
HmacMD5.java
HmacMD5KeyGenerator.java
HmacPKCS12PBESHA1.java
HmacSHA1.java
HmacSHA1KeyGenerator.java
ISO10126Padding.java
JceKeyStore.java
KeyGeneratorCore.java
KeyProtector.java
OAEPParameters.java
OutputFeedback.java
Padding.java
PBECipherCore.java
PBEKey.java
PBEKeyFactory.java
PBEParameters.java
PBEWithMD5AndDESCipher.java
PBEWithMD5AndTripleDESCipher.java
PBKDF2HmacSHA1Factory.java
PBKDF2KeyImpl.java
PCBC.java
PKCS12PBECipherCore.java
PKCS5Padding.java
PrivateKeyInfo.java
RC2Cipher.java
RC2Crypt.java
RC2Parameters.java
RSACipher.java
SslMacCore.java
SunJCE.java
SymmetricCipher.java
TlsKeyMaterialGenerator.java
TlsMasterSecretGenerator.java
TlsPrfGenerator.java
TlsRsaPremasterSecretGenerator.java

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