Thông dịch viên ngu ngốc

Tôi đã đọc về brainfuck, đó là một ngôn ngữ lập trình bí truyền. Tôi đã tạo một trình thông dịch cho nó bằng Java. Đây là mã:

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.util.ArrayList;

/**
 * Created by Проф on 10.02.2015.
 * Brainfuck language interpreter
 * used memory
 * short[] arr = chars[30000]
 * used operators
 * >    shift pointer right     pointer++
 * <    shift pointer left      pointer--
 * +    increment pointer       arr[pointer]++
 * -    decrement pointer       arr[pointer]--
 * [    begin loop              while (arr[pointer]) {
 * ]    end loop                }
 * .    print pointer           sout arr[pointer]
 * ,    enter from input string arr[pointer] = getchar
 */
public class Model {

    private static final int STACK_LENGHT = 30000;
    private static short[] arr = new short[STACK_LENGHT];
    //private static String strCommand = "----[---->+<]>++.";
    private static String strCommand = "++++++++++[>+++++++>++++++++++>+++>+<<<<-]>++.>+.+++++++..+++.>++.<<+++++++++++++++.>.+++.------.--------.>+.>.";
    //private static String strCommand = "++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++.[-]+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++.[-]++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++.[-]++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++.[-]+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++.[-]++++++++++++++++++++++++++++++++++++++++++++.[-]++++++++++++++++++++++++++++++++.[-]+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++.[-]+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++.[-]++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++.[-]++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++.[-]++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++.[-]+++++++++++++++++++++++++++++++++.[-]++++++++++.[-]";

    public static void main(String[] args) {
        System.out.println(interprete(strCommand));
    }

    public static String interprete(String strCommand) {
        StringBuilder retString = new StringBuilder();
        BufferedReader reader = new BufferedReader(new InputStreamReader(System.in));
        char[] cmd_stack = strCommand.toCharArray();
        int cmd_pointer = 0;    //command pointer
        int pointer = 0;        //memory pointer
        ArrayList<Integer> queue = new ArrayList<Integer>();

        while (cmd_pointer < cmd_stack.length) {
            switch (cmd_stack[cmd_pointer]) {
                case '+':
                    if ((arr[pointer]+1) > 255) arr[pointer] = 0;
                    else arr[pointer]++;
                    cmd_pointer++;
                    break;
                case '-':
                    if ((arr[pointer]-1) < 0) arr[pointer] = 255;
                    else arr[pointer]--;
                    cmd_pointer++;
                    break;
                case '>':
                    pointer++;
                    cmd_pointer++;
                    break;
                case '<':
                    pointer--;
                    cmd_pointer++;
                    break;
                case '.':
                    retString.append((char) arr[pointer]);
                    cmd_pointer++;
                    break;
                case ',':
                    try {
                        arr[pointer] = (short) Integer.parseInt(reader.readLine());
                    } catch (IOException e) {
                        e.printStackTrace();
                    }
                    cmd_pointer++;
                    break;
                case '[':
                    queue.add(cmd_pointer);
                    cmd_pointer++;
                    break;
                case ']':
                    if ((arr[pointer]) > 0) cmd_pointer = queue.remove(queue.size()-1);
                    else cmd_pointer++;
                    break;
                default:
                    cmd_pointer++;
                    break;

            }
        }
        return retString.toString();
    }
}