Java - Cadena, donde a cada letra se le agrega una letra

public static void main(String[] args) throws IOException{

    BufferedReader cadena;

    char[] abc;

    abc=new char[26];

    System.out.println("Ingresa una cadena");

    cadena = new BufferedReader (new InputStreamReader(System.in));

    String palong = cadena.readLine();

    for ( int i=0; i<palong.length(); i++) {

        abc[i] = (char) ( palong.charAt(i)+(i+2));

    }

    System.out.println(abc);

}

for ( int i=0; i<palong.length(); i++) {

        abc[i] = (char) ( palong.charAt(i)+(i+2));

    }

for ( int i=0; i<palong.length(); i++) {

        abc[i] = (char) ( palong.charAt(i)+(2));

    }

public static void main(String[] aqrgs) throws IOException {

    char[] caracteres = {'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J', 'K', 'L', 'M', 'N', 'Ñ', 'O', 'P', 'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X', 'Y', 'Z', '1', '2', '3', '4', '5', '6', '7', '8', '9', '0'};

    BufferedReader br = new BufferedReader(new InputStreamReader(System.in));

    System.out.print("Ingresa una cadena: ");

    String cadena = br.readLine();

    String salida = "";

    for (char c : cadena.toCharArray()) {

        for (int i = 0; i < caracteres.length; i++) {

            if (c == caracteres[i]) {

                salida += i + 2 < caracteres.length ? caracteres[i + 2] : caracteres[(i + 2) - caracteres.length];

            }

        }

    }

    System.out.println("Salida: " + salida);

}