pastebin - collaborative debugging

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package encrypttext;

/**
 *
 * @author Walter
 */
public class Main {

    /**
     * @param args the command line arguments
     */
    public static void main(String[] args) {

        String inputString = "So, I'm pretty bored now, how about you?";
        String outputString = "";
        String originalString = "";
        byte encryptionArray[] = new byte[128];
        for (int i = 0; i < 128; i++)
        {
            encryptionArray[i] = (byte) (Math.random() * 128);
        }
        for (int i = 0; i < inputString.length(); i++)
        {
            char x = inputString.charAt(i);
            x ^= encryptionArray[i%128];
            outputString += x;
        }
        System.out.println(outputString);
        for (int i = 0; i < outputString.length(); i++)
        {
            char x = outputString.charAt(i);
            x ^= encryptionArray[i%128];
            originalString += x;
        }
        System.out.println(originalString);
        String key = "";
        for (int i = 0; i < 128; i++)
        {
            key += encryptionArray[i] + " ";
        }
        System.out.println("\n Your key is: " + key);
    }

}