Question

因此，我正在尝试使用Java编写UNO，而我仍在尝试生成卡片。我不太确定这是什么问题，但是由于某种原因，我的代码在我的方法中捕获了一个错误。我已经检查了我的代码几次，这不是语法错误，所以我当然不知道它是怎么回事。

我现在暂时停止对此代码进行编码，以便在大家告诉我出了什么问题之前，我不会再产生任何错误，以便更轻松地对其进行修改。请告诉我我做错了！

public class JavaUNO {
    public static void main(String[] args) throws Exception {
        boolean inProgress = false;
        boolean drawCard = false;
        String[][] playerDeck = {{}};
        byte playerDeckLength = 0;

        // MAIN OUTPUT
        try {
            // INITIALIZATION
            Scanner scan = new Scanner(System.in);

            // PROGRAM STARTING PROMPT
            System.out.println("> Deck:");

            // **PLAYER DECK INIT**
            try {
                System.out.println("> Cards Generated:");
                while (playerDeckLength < 7) {
                    // **CARD GENERATION**
                    try {
                        // INITIALIZATION
                        double randType = Math.random();
                        double randColor = Math.random();
                        playerDeck[playerDeckLength][0] = "";
                        playerDeck[playerDeckLength][1] = "";

                        // GENERATES RANDOM CARD TYPE
                        if (randType < 0.066) {
                            playerDeck[playerDeckLength][0] = "0";
                        } else if (randType < 0.132) {
                            playerDeck[playerDeckLength][0] = "1";
                        } else if (randType < 0.198) {
                            playerDeck[playerDeckLength][0] = "2";
                        } else if (randType < 0.264) {
                            playerDeck[playerDeckLength][0] = "3";
                        } else if (randType < 0.33) {
                            playerDeck[playerDeckLength][0] = "4";
                        } else if (randType < 0.396) {
                            playerDeck[playerDeckLength][0] = "5";
                        } else if (randType < 0.462) {
                            playerDeck[playerDeckLength][0] = "6";
                        } else if (randType < 0.528) {
                            playerDeck[playerDeckLength][0] = "7";
                        } else if (randType < 0.594) {
                            playerDeck[playerDeckLength][0] = "8";
                        } else if (randType < 0.66) {
                            playerDeck[playerDeckLength][0] = "9";
                        } else if (randType < 0.726) {
                            playerDeck[playerDeckLength][0] = "Reverse Cycle";
                        } else if (randType < 0.792) {
                            playerDeck[playerDeckLength][0] = "+2 Cards";
                        } else if (randType < 0.858) {
                            playerDeck[playerDeckLength][0] = "+4 Cards";
                        } else if (randType < 0.924) {
                            playerDeck[playerDeckLength][0] = "Skip Turn";
                        } else if (randType < 1) {
                            playerDeck[playerDeckLength][0] = "Color Change";
                        }

                        //GENERATES RANDOM CARD COLOR
                        if (randColor < 0.25) {
                            playerDeck[playerDeckLength][1] = "Blue";
                        } else if (randColor < 0.5) {
                            playerDeck[playerDeckLength][1] = "Yellow";
                        } else if (randColor < 0.75) {
                            playerDeck[playerDeckLength][1] = "Red";
                        } else if (randColor < 1) {
                            playerDeck[playerDeckLength][1] = "Green";
                        }

                        //CHECKS IF CARD IS WILDCARD
                        if (playerDeck[playerDeckLength][0] == "+4 Cards") {
                            playerDeck[playerDeckLength][1] = "Wildcard";
                        } else if (playerDeck[playerDeckLength][0] == "+2 Cards") {
                            playerDeck[playerDeckLength][1] = "Wildcard";
                        } else if (playerDeck[playerDeckLength][0] == "Color Change") {
                            playerDeck[playerDeckLength][1] = "Wildcard";
                        }

                        playerDeckLength += 1;
                    } catch (Exception e) {
                        System.out.println("");
                        System.out.println("> An uncaught error occured!");
                        System.out.println("> Location: Card Generation");
                    }
                    System.out.println("Type: " + playerDeck[playerDeckLength][0] + "; Color: " + 

playerDeck[playerDeckLength][1]);
                }
            } catch (Exception e) {
                System.out.println("");
                System.out.println("> An uncaught error occured!");
                System.out.println("> Location: Player Deck Init");
            }
        } catch (Exception e) {
            System.out.println("");
            System.out.println("> An uncaught error occured!");
            System.out.println("> Location: Main Output");
        }
    }
}

命令提示符：

> Deck:
> Cards Generated:

> An uncaught error occurred!
> Location: Card Generation

> An uncaught error occurred!
> Location: Player Deck Init

Answer 1

您正在初始化一个空的二维字符串数组。该代码尝试访问未分配的索引，因此我认为程序可能会抛出IndexOutOfBounds异常

Answer 2

似乎有很多代码，但类/函数却很少；）

首先，尝试组织更好的代码，这将使调试，修改和维护代码更加容易。我还邀请您阅读有关Java中的Exception和Exception处理的信息，您会发现每次使用Exception都会导致很多问题！

当然，我们中的一些人将能够使您的程序正常运行，但是说实话，您只需要阅读更多内容，您就可以做到：）

Answer 3

您不初始化数组，可能会出现“ IndexOutOfBounds”错误。尝试使用以下方式初始化数组：“ String [] [] playerDeck = new String [7] [2];”。另外，您还需要将支票从playerDeck[playerDeckLength][0] == "+4 Cards"更改为if (playerDeck[playerDeckLength][0].equalsIgnoreCase("+4 Cards"))

Answer 4

问题是您初始化了一个空（二维）数组。当您尝试访问它时，它将给出索引超出范围的异常。如果知道大小，则必须以该大小启动它。

除此之外，请检查对您的问题的评论。这应该可以帮助您自己解决这些问题。

我的程序遇到错误，我不知道如何解决

4 个答案: