Quest 5: Decipher secret messages

Decipherer.java

public class Decipherer {

	public static String decrypt(String encryptedText) {
		
		final int STARTINDEX = 5;
		int codeLength = encryptedText.length()/2;
		
		encryptedText = encryptedText.substring(STARTINDEX, STARTINDEX + codeLength).replace("@#?", " ");
		
		// convert String to character array 
        // by using toCharArray 
        char[] decryptedCharArray = encryptedText.toCharArray(); 
        int textLen = decryptedCharArray.length;
        for (int i = 0; i < textLen/2; i++) { 
            char swap = decryptedCharArray[i];
        	decryptedCharArray[i] = decryptedCharArray[textLen-i-1];
        	decryptedCharArray[textLen-i-1] = swap;
        };
        return new String(decryptedCharArray);
	}
	
	public static void main(String[] args) {
		
		String secret1 = "0@sn9sirppa@#?ia'jgtvryko1";
		String secret2 = "q8e?wsellecif@#?sel@#?sel@#?setuotpazdsy0*b9+mw@x1vj";
		String secret3 = "aopi?sedohtém@#?sedhtmg+p9l!";
		
		System.out.println("Meldung 1:" + decrypt(secret1));
		System.out.println("Meldung 2:" + decrypt(secret2));
		System.out.println("Meldung 3:" + decrypt(secret3));
	}

}

Output

Meldung 1:j'ai appris
Meldung 2:tes les les ficelles
Meldung 3:des méthodes