String para MD5

// Transforma uma String em md5 hash

import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;

class Inicio{
    public static void main(String[] args) {
        try {
            System.out.println(md5("Palavra"));
        } catch (NoSuchAlgorithmException e) {
            e.printStackTrace();
        }
    }

    //Jeito mais fácil
    public static void md5() throws NoSuchAlgorithmException {
        String s="1234";
        MessageDigest m = MessageDigest.getInstance("MD5");
        m.update(s.getBytes(),0,s.length());
        System.out.println("MD5: "+new BigInteger(1,m.digest()).toString(16));
    }

    //Jeito antigo
    public String md5(){
        MessageDigest m=MessageDigest.getInstance("MD5");
        m.update(s.getBytes(),0,s.length());
        BigInteger a = new BigInteger(1,m.digest());
        return String.format("%1$032X", a).toLowerCase();
    }
}