Simple JAVA program, please take a look at it! Give more advice, learn the reference

interfaces\package.html
package.html
spec\package.html
BadPaddingException.java
Cipher.java
CipherInputStream.java
CipherOutputStream.java
CipherSpi.java
CryptoAllPermission.java
CryptoPermission.java
CryptoPermissions.java
CryptoPolicyParser.java
dAEADBadTagException.java
spec\DESedeKeySpec.java
spec\DESKeySpec.java
spec\DHGenParameterSpec.java
interfaces\DHKey.java
spec\DHParameterSpec.java
interfaces\DHPrivateKey.java
spec\DHPrivateKeySpec.java
interfaces\DHPublicKey.java
spec\DHPublicKeySpec.java
EncryptedPrivateKeyInfo.java
ExemptionMechanism.java
ExemptionMechanismException.java
ExemptionMechanismSpi.java
spec\GCMParameterSpec.java
IllegalBlockSizeException.java
spec\IvParameterSpec.java
JarVerifier.java
JceSecurity.java
JceSecurityManager.java
KeyAgreement.java
KeyAgreementSpi.java
KeyGenerator.java
KeyGeneratorSpi.java
Mac.java
MacSpi.java
NoSuchPaddingException.java
NullCipher.java
NullCipherSpi.java
spec\OAEPParameterSpec.java
interfaces\PBEKey.java
spec\PBEKeySpec.java
spec\PBEParameterSpec.java
spec\PSource.java
spec\RC2ParameterSpec.java
spec\RC5ParameterSpec.java
SealedObject.java
SecretKey.java
SecretKeyFactory.java
SecretKeyFactorySpi.java
spec\SecretKeySpec.java
ShortBufferException.java
interfaces
spec

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