Question

这是我的错误指向的代码：

shipX = shipOne.getX();

EDIT2：具体来说，它无法找到shipOne。

Ship对象shipOne在Switch语句内初始化，而不是上述代码之前的十行。我很确定错误是由于在Switch语句中初始化对象而出现的，我不知道如何处理。总共有八个Ship对象通过循环初始化，因此上面的代码需要在Switch语句或If语句中，这两个我确定会导致相同的错误。是否有我可以抛出的异常或导致我的程序运行的东西？ Ship对象做在100％的时间内被初始化，因此不用担心。

编辑：我被问到其余的代码，所以这里是：

（这不是全部内容，因为您无法看到退货声明，但其余部分与我的问题无关）。

public static String[][] createFleet()
  {
  //Initialize Variables
     //Ship Variables
  boolean isHoriz = true;    //Is true if ship is Horizontal, false if Vertical
  char ID;
  int posX = 0;              //Origin of the ship (x coordinate [row])
  int posY = 0;              //Origin of the ship (y coordinate [column])
  int size = 0;              //Either 2, 3, or 4
     //Associated Variables
  Random randomGen = new Random();          //Random number generator
  String[][] board = new String[10][10];    //Gameboard, populated with ships
  int orientationRand = 0;                  //If 0, Ship Horizontal. If 1, Ship Vertical
  int posRand = 0;                          //Assigned to posX or posY
  int sizeRand = 0;                         //If 0 <= x < 10,   size = 2
                                            //If 10 <= x < 40,  size = 3
                                            //If 40 <= x < 100, size = 4

      //Create Ships
  for (int i = 0; i < 8; i++)
  {
     //Size
     sizeRand = randomGen.nextInt(100);
     if (sizeRand < 10)
     {
        size = 2;
     }
     else if (sizeRand < 40)
     {
        size = 3;
     }
     else size = 4;
     //Orientation & Position
     orientationRand = randomGen.nextInt(2);
     if (orientationRand == 0)
     {
        //Orientation
        isHoriz = true;
        //Position (horizontal)
           //x position
        switch (size)
        {
           case 2:
              posRand = randomGen.nextInt(9);
              posX = posRand;
              break;
           case 3:
              posRand = randomGen.nextInt(8);
              posX = posRand;
              break;
           case 4:
              posRand = randomGen.nextInt(7);
              posX = posRand;
              break;
        }
           //y position
        posRand = randomGen.nextInt(10);
        posY = posRand;
     }
     else
     {
        //Orientation
        isHoriz = false;
        //Position (vertical)
           //x position
        posRand = randomGen.nextInt(10);
        posX = posRand;
           //y position
        switch (size)
        {
           case 2:
              posRand = randomGen.nextInt(9);
              posY = posRand;
              break;
           case 3:
              posRand = randomGen.nextInt(8);
              posY = posRand;
              break;
           case 4:
              posRand = randomGen.nextInt(7);
              posY = posRand;
              break;
        }
     }

     //Assign Size, Orientation, and Position to each ship
     switch (i)
     {
        case 0:
           ID = 'A';
           Ship shipOne = new Ship(posX, posY, size, isHoriz, ID);
           break;
        case 1:
           ID = 'B';
           Ship shipTwo = new Ship(posX, posY, size, isHoriz, ID);
           break;
        case 2:
           ID = 'C';
           Ship shipThree = new Ship(posX, posY, size, isHoriz, ID);
           break;
        case 3:
           ID = 'D';
           Ship shipFour = new Ship(posX, posY, size, isHoriz, ID);
           break;
        case 4:
           ID = 'E';
           Ship shipFive = new Ship(posX, posY, size, isHoriz, ID);
           break;
        case 5:
           ID = 'F';
           Ship shipSix = new Ship(posX, posY, size, isHoriz, ID);
           break;
        case 6:
           ID = 'G';
           Ship shipSeven = new Ship(posX, posY, size, isHoriz, ID);
           break;
        case 7:
           ID = 'H';
           Ship shipEight = new Ship(posX, posY, size, isHoriz, ID);
           break;
     }
  }

Answer 1

在您的代码中，“ID”变量未在任何地方声明。您必须在使用之前声明变量。

Answer 2

在switch或if语句之前将对象初始化为null。我认为这应该可以解决你的问题。

如果发布了整个代码，则可以提供更好的解决方案。

＆＃34;错误：找不到符号＆＃34;符号在Switch语句中

2 个答案: