RAM

import java.io.BufferedReader;
import java.io.File;
import java.io.FileReader;
import java.io.IOException;
import java.util.Scanner;

public class Programm {

    static int MAX_REG = 10;
    static int akkumulator;
    static int PC = 0;
    static int[] register = new int[MAX_REG];

    public static void main(String args[]) {

        initReg(register);
        String dateiName = "RAM.txt";
        ladeDatei(dateiName);
    }

    private static void ladeDatei(String datName) {

        File file = new File(datName);

        if (!file.canRead() || !file.isFile())
            System.exit(0);

        BufferedReader in = null;

        try {

            in = new BufferedReader(new FileReader(datName));
            String zeile = null;

            while ((zeile = in.readLine()) != null) {

                if(PC == 99) break; //Programm Ende, Hlt 99

                for (int i = 0; i<PC-1; i++) {
                    zeile = in.readLine();
                }

                leseZeile(zeile);
                in.close();
                in = new BufferedReader(new FileReader(datName));

            }
        } catch (IOException e) {
            e.printStackTrace();
        } finally {
            if (in != null)
                try {
                    in.close();
                } catch (IOException e) {
                }
        }
    }

    private static void leseZeile(String zeile) {
        String befehl = zeile.substring(0, 2);
        String adresse = zeile.substring(2, 4);
        befehlsTabelle(befehl, adresse);
        return;
    }

    private static void befehlsTabelle(String befehl, String adresse) {

        int wert = Integer.parseInt(adresse);

        switch (befehl) {
        case "01":
            akkumulator += register[wert];
            break;

        case "02":
            akkumulator -= register[wert];
            break;

        case "03":
            akkumulator *= register[wert];
            break;

        case "04":
            akkumulator /= register[wert];
            break;

        case "05":
            akkumulator = register[wert];
            break;

        case "06":
            akkumulator = wert;
            break;

        case "07":
            register[wert] = akkumulator;
            break;

        case "08":
            Scanner sc = new Scanner(System.in);
            System.out.print("Bitte Wert für n eingeben: ");
            register[wert] = sc.nextInt();
            sc.close();
            break;

        case "09":
            System.out.println(register[wert]);
            break;

        case "0A":
            PC = wert;
            return;

        case "0B":
            PC = wert;
            return;

        case "0C":
            if (akkumulator == 0) {
                PC = wert;
                return;
            }
            break;

        case "0D":
            if (akkumulator != 0) {
                PC = wert;
                return;
            }
            break;

        case "0E":
            if (akkumulator < 0) {
                PC = wert;
                return;
            }
            break;

        case "0F":
            if (akkumulator <= 0) {
                PC = wert;
                return;
            }
            break;

        case "10":
            if (akkumulator > 0) {
                PC = wert;
                return;
            }
            break;

        case "11":
            if (akkumulator >= 0) {
                PC = wert;
                return;
            }
            break;
        }

        PC++;
        return;
    }



    private static void initReg(int[] register) {
        for (int i = 0; i < register.length; i++) {
            register[i] = 0;
        }

        return;
    }
}