应为')‘，表达式的开头非法

Question

Test. java:8 :')' expected
Test. java: 8: error :illegal start of expression
Test. java:9 :')' expected
Test. java: 9: error :illegal start of expression

第8行和第9行是：

blackjackplayer = checkForBlackJacks(BlackJackHand playerhand);
blackjackdealer = checkForBlackJacks(BlackJackHand dealerhand);

这个类是：

  public class Test{
        public void playround (){
                int temp = -1;
                playerhand = new BlackJackHand(22);
                dealerhand = new BlackJackHand(22);
                addCards(playerhand, 2);
                addCards(dealerhand, 2);
                blackjackplayer = checkForBlackJacks(BlackJackHand playerhand);
                blackjackdealer = checkForBlackJacks(BlackJackHand dealerhand);
                while(temp!=2&&playerhand.gettotal()<=21){
                    printHands(false, true, true);
                    temp = Prompt.getInt("\nPress 1 to hit, or 2 to stand. ", 1, 2);
                    if (temp==1&&playerhand.gettotal()<=21){
                        addCards(playerhand,1);
                    }
                }
                if (playerhand.gettotal()>21){
                    playerbust = true;
                }
                else{
                    seeWhoWon();
                }
                    //done = true;
        }
        public boolean checkForBlackJacks (BlackJackHand x){
            return (x.gettotal()==21&&x.getmyhand().size()==2);
        }
    }

这只是一个包含错误部分的java文件。真正的程序拥有所有的组件。

Answer 1

将值作为方法参数传递时，必须只包含对象的名称，而不能包含其类型。

blackjackplayer = checkForBlackJacks(playerhand);
blackjackdealer = checkForBlackJacks(dealerhand);

Answer 2

将行更改为

blackjackplayer = checkForBlackJacks(playerhand);
blackjackdealer = checkForBlackJacks(dealerhand);

您只需要传递已经创建的对象名称。不需要使用类名。

Answer 3

这显然是一个语法错误。方法调用如下所示：

blackjackplayer = checkForBlackJacks(playerhand);

不是这个

blackjackplayer = checkForBlackJacks(BlackJackHand playerhand);

如果您查看错误消息的字符位置，它很可能位于playerHand符号的位置...它告诉你，它期望这个符号是一个')'。如果你不理解一条错误消息，试着从字面上去读它通常会有所帮助……