Question

我正在使用 Eclipse 控制台创建一个迷宫游戏。我试图移动一个玩家，并保存玩家的新位置，以便我可以将他移动到另一个方向。但是，每次我尝试移动播放器时，我都会让索引 ___ 超出长度 5（通常是 -1 或 5）的边界。它正在跳过整个数组，我不确定如何修复它。

运行时，它会打印以下内容

P。 . ！ .

。 . . . .

。 . . ！ .

！！ .

！ . ！！ .

请选择以下选项之一：

按 1 向上移动。

按 2 向下移动。

按 3 向左移动。

按 4 向右移动。

按 0 停止玩游戏。

我只列出了一个动作，但其他动作都是一样的，只是变量互换。每个选项都返回超出范围的索引。有人建议我创建一个“检查”系统，但这并不能解决问题。它只是运行程序而不允许任何移动，因为每个移动都返回了界限。我相信这与线路有关

mazeStructure[vxTemp][vyTemp] = mazeStructure[i][k-1];

无论是那个还是与 for 条件有关的东西。如果有人可以提供修复，将不胜感激。

Scanner input = new Scanner(System.in);
int rowsTotal = 5;
int columnsTotal = 5;
int vxTemp = 0;
int vyTemp = 0;
String[][] mazeStructure =  {
        {"P",".",".","!","."},
        {".",".",".",".","."},
        {".",".",".","!","."},
        {"!","!",".","T","."},
        {"!",".","!","!","."},
};

 boolean won = false;
while (won == false){
    for (int a = 0; a < rowsTotal; a++){
        for (int b = 0; b < columnsTotal; b++){
            System.out.print(mazeStructure[a][b]);
            System.out.print(" ");
    }
        System.out.print("\n");
  }


    System.out.printf("\n");
    System.out.println("Please select one of the following:");
    System.out.println("Press 1 to move up.");
    System.out.println("Press 2 to move down.");
    System.out.println("Press 3 to move left.");
    System.out.println("Press 4 to move right.");
    System.out.println("Press 0 to stop playing the game.");
    int choice = input.nextInt();
    int a = 0;

   
    if (choice == 1 && a >= 0 && a < columnsTotal){
    for (int i = 0; i < rowsTotal; i++){
        for (int k = 0; k < columnsTotal; k++){
        if (mazeStructure[vxTemp][vyTemp-1].equals("!") == false && mazeStructure[i][k].equals(mazeStructure[vxTemp][vyTemp])){
                    mazeStructure[vxTemp][vyTemp] = ".";
                    mazeStructure[vxTemp][vyTemp-1] = "P";
                    mazeStructure[vxTemp][vyTemp] = mazeStructure[i][k-1];
       }else if (mazeStructure[vxTemp][vyTemp-1] == "!"){
                    System.out.println("Move isn't allowed.");
       }else {
        continue;}

Answer 1

在 if (mazeStructure[vxTemp][vyTemp-1].equals("!") == false && mazeStructure[i][k].equals(mazeStructure[vxTemp][vyTemp])){ 行中，您尝试访问 mazeStructure 处的 [vxTemp][vyTemp-1]。您将 vyTemp 初始化为 0，在此之前它不会更改。您通过尝试 vyTemp - 1 开始该循环，该值将为 -1。这将超出您的数组范围。

您对循环中的变量 k 执行相同的操作。 k 附近的第一次将为零。因此，尽管 k - 1 存在是可以的，但您不能尝试访问某个 -1 索引处的任何数组。

Answer 2

我猜问题出在这一行中的 vyTemp-1

if (mazeStructure[vxTemp][vyTemp-1].equals("!") == false && mazeStructure[i][k].equals(mazeStructure[vxTemp][vyTemp])){

vyTemp 的初始值为 0

Answer 3

Scanner input = new Scanner(System.in);
int rowsTotal = 5;
int columnsTotal = 5;
int vxTemp = 0;
int vyTemp = 0;
String[][] mazeStructure =  {
        {"P",".",".","!","."},
        {".",".",".",".","."},
        {".",".",".","!","."},
        {"!","!",".","T","."},
        {"!",".","!","!","."},
};

 boolean won = false;
while (won == false){
    for (int a = 0; a < rowsTotal; a++){
        for (int b = 0; b < columnsTotal; b++){
            System.out.print(mazeStructure[a][b]);
            System.out.print(" ");
    }
        System.out.print("\n");
  }


    System.out.printf("\n");
    System.out.println("Please select one of the following:");
    System.out.println("Press 1 to move up.");
    System.out.println("Press 2 to move down.");
    System.out.println("Press 3 to move left.");
    System.out.println("Press 4 to move right.");
    System.out.println("Press 0 to stop playing the game.");
    int choice = input.nextInt();
    int a = 0;

   
    if (choice == 1 && a >= 0 && a < columnsTotal){
    for (int i = 0; i < rowsTotal; i++){
        for (int k = 0; k < columnsTotal; k++){

<块引用>

//if 条件有错误。如果你的选择是 1. 它会运行这个如果条件 'mazeStructure[vxTemp][vyTemp-1].equals("!")'。作为 vyTemp = 0. vyTemp -1 < 0. java.lang.ArrayIndexOutOfBoundsException

 if (mazeStructure[vxTemp][vyTemp-1].equals("!") == false && mazeStructure[i][k].equals(mazeStructure[vxTemp][vyTemp])){
                    mazeStructure[vxTemp][vyTemp] = ".";
                    mazeStructure[vxTemp][vyTemp-1] = "P";
                    mazeStructure[vxTemp][vyTemp] = mazeStructure[i][k-1];
       }else if (mazeStructure[vxTemp][vyTemp-1] == "!"){
                    System.out.println("Move isn't allowed.");
       }else {
        continue;}

修复索引越界数组？

3 个答案: