I made my first attempt at blackjack java code but the method is long. What should I do?

Return the boolean directly in the blackjack java code

The following:
public static boolean isyesorno(String answer)
{
    if(answer.equals("yes") || answer.equals("no"))
    {
        return true;
    }
    return false;
}
should become:
public static boolean isyesorno(String answer) {
    return answer.equals("yes") || answer.equals("no"))
}

The same goes for public static boolean hasBlackJack(int handValue) and public static boolean isHitorStand(String hitter) and public static boolean checkBust(int handvalue) for the latter you should move printing out of the function.

Use already existing wheels

You can shuffle the deck by using the built-in:
List list =  Arrays.asList(deck);
Collections.shuffle(list);