Generally we need to encode the password in our Applications for security purpose and we can use MD5 for this purpose.

Example - In the below method I'm encoding sting by using MD5

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

    /**
     * This method encode the provided string
     *
     * @param text
     * @return
     */
    public static String MD5ToString(String salt)
    {
        MessageDigest md = null;
        try
        {
            md = MessageDigest.getInstance("MD5");
        }
        catch (NoSuchAlgorithmException e)
        {
            e.printStackTrace();
        }
        md.update(salt.getBytes());

        byte byteData[] = md.digest();

        StringBuffer sb = new StringBuffer();
        for (int i = 0; i < byteData.length; i++)
            sb.append(Integer.toString((byteData[i] & 0xff) + 0x100, 16).substring(1));

        return sb.toString();
    }

Hope this will help you :)