how to store value from cursor into string

im creating application that can retrieve contact name from number. while i googling , i got this block of code from this post

Getting contact name from number in Android 2.3.4

public static String getContactName(String num, ContentResolver cr) {

    Uri u = Uri.withAppendedPath(PhoneLookup.CONTENT_FILTER_URI Uri.encode(num));
    String[] projection = new String[] { ContactsContract.Contacts.DISPLAY_NAME};

    Cursor c = cr.query(u, projection, null, null, null);

    try {
        if (!c.moveToFirst())
            return number;

        int index = c.getColumnIndex(ContactsContract.Contacts.DISPLAY_NAME);
        return c.getString(index);

    } finally {
        if (c != null)
            c.close();
    }
}

i m successfully able to send Number as String num in the function

but do not know how to store contact name into String. I m not familiar with Cursor in android

if i m wrong please correct me,

help will be appreciated , thanks in Advance