package com.vvzorichev.hash;

public class Main {
    public static void main(String[] args) {
        switch (args[0]) {

            case "-i":
                InteractiveMode imobj = new InteractiveMode(args);
                break;

            default:
                SimpleMode smobj = new SimpleMode(args);
                break;
        }
    }
}

package com.vvzorichev.hash;

import java.io.IOException;
import java.util.Scanner;

public class InteractiveMode {

    private String Args[];
    private boolean Stop;

    public InteractiveMode(String input[]) {
        this.Args = input;
        this.Stop = false;
    }

    private void PrintHash(String fileName) {
        try
        {
            CountHash chObj = new CountHash(fileName);
            String md5 = chObj.CountMd5();
            String sha256 = chObj.CountSha256();
            System.out.println("\nFile : " + fileName + "\nMd5 : " + md5 + "\nSha256 : " + sha256 + "\n");
        }
        catch (IOException ex)
        {
            System.out.println("File does not found!\n");
        }
    }

    public void Interactive() {
        while (!stop) {
            System.out.println("Enter file / files names:");
            Scanner input = new Scanner(System.in);
            for (String str : input.nextLine().split(" ")) {
                printHash(str);
            }
            boolean answer = false;
            while (!answer) {
                System.out.println("Do you want to count hash of another files?\n1 - Yes\n2 - No");
                String response = input.next();
                switch(response){

                    case "2":
                        stop = true;
                        answer = true;
                        break;

                    case "1":
                        answer = true;
                        break;

                    default:
                        System.out.println("Incorrect answer! Try again");
                        break;
                }
            }
        }
    }
}

package com.vvzorichev.hash;

import org.apache.commons.codec.digest.DigestUtils;

import java.io.FileInputStream;
import java.io.IOException;

public class CountHash {

    private String fileName;

    public CountHash(String str) {
        this.fileName = str;
    }

    public String CountMd5() throws IOException {
        return DigestUtils.md5Hex(new FileInputStream(fileName));
    }

    public String CountSha256() throws IOException {
        return DigestUtils.sha256Hex(new FileInputStream(fileName));
    }
}

package com.vvzorichev.hash;

import java.io.IOException;

public class SimpleMode {

    private String Args[];
    public String HashType;

    public SimpleMode(String input[]) {
        this.Args = input;
        this.HashType = Args[0];
    }