Java intro into crypto 1

import java.math.BigInteger;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
import java.util.ArrayList;

public class Main {

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

        String[] testStringArray = { "something","I don't know", "Bruhhh"};
       ArrayList<String> result =new ArrayList<>();
        if(args.length > 0){
            for (String arg : args) {
                result.add(encrypt(arg));
            }
        }else
        {
            for (String test: testStringArray) {
                result.add(encrypt(test));
            }
        }
        System.out.println(result);

    }

    public static String encrypt(String text){

        MessageDigest m = null;
        try {
            m = MessageDigest.getInstance("MD5");
        } catch (NoSuchAlgorithmException e) {
            throw new RuntimeException(e);
        }

        m.reset();
        m.update(text.getBytes());
        byte[] digest = m.digest();
        BigInteger bigInt = new BigInteger(1,digest);
        String hashtext = bigInt.toString(16);
        // Now we need to zero pad it if you actually want the full 32 chars.
        while(hashtext.length() < 32 ){
            hashtext = "0"+hashtext;
        }

        return hashtext;


    }
}