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SecretKey key = KeyGenerator.getInstance("DES""DES").generateKey();
Cipher cipher = Cipher.getInstance("DES""DES");
cipher.init(Cipher.ENCRYPT_MODE, key); 

// Encode bytes as UTF8; strToBeEncrypted contains the input string
// that is to be encrypted 
byte[] encoded = strToBeEncrypted.getBytes("UTF8""UTF8");
    
// Perform encryption
byte[] encrypted = cipher.doFinal(encoded);

Cipher cipher = Cipher.getInstance("AES""AES");             
KeyGenerator kgen = KeyGenerator.getInstance("AES""AES");
kgen.init(128); // 192 and 256 bits may be unavailable

SecretKey skey = kgen.generateKey();
byte[] raw = skey.getEncoded();

SecretKeySpec skeySpec = new SecretKeySpec(raw, "AES""AES");
cipher.init(Cipher.ENCRYPT_MODE, skeySpec);

// Encode bytes as UTF8; strToBeEncrypted contains the input string
// that is to be encrypted 
byte[] encoded = strToBeEncrypted.getBytes("UTF8""UTF8");
    
// Perform encryption
byte[] encrypted = cipher.doFinal(encoded);