Ejercicio Entero Hex

import java.util.Scanner
public class Ejercicio{

    public static void main(String [] args){
        Scanner scan = new Scanner(System.in);
        System.out.print("Pegar Hex: ");
        String hex =scan.nextLine();
        String [] arr= hex.split(" ");
        String num [] = new String [arr.length];
        for(int i = 0; i < num.length;i++){
            int he = Integer.decode(arr[i]);
            if(he%2 == 0){
                num[i] = Integer.toHexString(he+1);
            }else{
                num[i] = Integer.toHexString(he-1);
            }
            System.out.print((char)Integer.parseInt(num[i], 16));
        }
        System.out.println();
    }
}