Question

所以我正在为我的Java类做这个任务，我一直遇到这个错误"unreachable code"，我无法找到如何解决这个错误，甚至不知道为什么会发生这个错误。请帮忙！

public static void main(String[] args)
    {

        int suit;
        int cardNumber;


        Random generator = new Random();


          suit = generator.nextInt (4)+1;;
            String suitString;
            switch (suit) {
                case 1:  suitString = "hearts!";
                         break;
                case 2:  suitString = "diamonds!";
                         break;
                case 3:  suitString = "clubs!";
                         break;
                case 4:  suitString = "spades!";
                         break;


         cardNumber = generator.nextInt (13) +1;; //unreachable code
            String cardNumberString;
            switch (cardNumber) {
                case 1: cardNumberString = "ace";
                    break;
                case 2: cardNumberString = "2";
                break;
                case 3: cardNumberString = "3";
                break;
                case 4: cardNumberString = "4";
                break;
                case 5: cardNumberString = "5";
                break;
                case 6: cardNumberString = "6";
                break;
                case 7: cardNumberString = "7";
                break;
                case 8: cardNumberString = "8";
                break;
                case 9: cardNumberString = "9";
                    break;
                case 10: cardNumberString = "10";
                break;
                case 11: cardNumberString = "11";
                break;
                case 12: cardNumberString = "12";
                break;
                case 13: cardNumberString = "13";
                break;

Answer 1

第一个switch之后，case 4语句没有结束括号。下一个陈述是在break之后，这意味着它无法到达。

switch (suit) {
            case 1:  suitString = "hearts!";
                     break;
            case 2:  suitString = "diamonds!";
                     break;
            case 3:  suitString = "clubs!";
                     break;
            case 4:  suitString = "spades!";
                     break;
} // Need to close the switch statement

Answer 2

您必须关闭括号。 case 4 {未关闭后，代码无法访问。

switch (suit) {
            case 1:  suitString = "hearts!";
                     break;
            case 2:  suitString = "diamonds!";
                     break;
            case 3:  suitString = "clubs!";
                     break;
            case 4:  suitString = "spades!";
                     break;
} //Here

为什么我一直得到“无法访问的代码”，我该如何解决？

2 个答案: