Encrypt and decrypt with secret in Java

encryptdecrypt.java

try {
			byte[] secretBytes = "secretsecretsecr".getBytes();
			Cipher c = Cipher.getInstance("AES");
			SecretKeySpec k =
			  new SecretKeySpec(secretBytes, "AES");
			c.init(Cipher.ENCRYPT_MODE, k);
			byte[] encryptedData = c.doFinal("I am carl sagan.".getBytes());
			encryptedData[3] = 7;
			c.init(Cipher.DECRYPT_MODE, k);
			byte[] data = c.doFinal(encryptedData);
			System.out.println(new String(data));

		} catch (NoSuchAlgorithmException e) {
			e.printStackTrace();
		} catch (NoSuchPaddingException e) {
			e.printStackTrace();
		} catch (InvalidKeyException e) {
			e.printStackTrace();
		} catch (IllegalBlockSizeException e) {
			e.printStackTrace();
		} catch (BadPaddingException e) {
			e.printStackTrace();
		}