Java越界異常

Question

這段代碼可以正常工作，但它始終為我提供數組超出范圍的異常，即使我將數組大小更改為6並在最后保留2個空插槽也會引發異常。 有人可以找出問題所在嗎？

  int [] arrayCMYK = new int [4];
  getCMYK(arrayCMYK);

static int getCMYK (int arrayCMYK[])
   {
   Scanner input = new Scanner(System.in);
   //C
   System.out.println("\n\nPlease Enter the 'C' value of the CMYK number.");
   System.out.println("Press Enter after the number has been entered.");
   arrayCMYK[0] = input.nextInt();

   while(arrayCMYK [0] > 100 || arrayCMYK [0] < 0 )
   {
   System.out.println("\n\nError\nPlease Enter the 'C' value of the CMYK number.");
   System.out.println("Press Enter after the number has been entered.");
   arrayCMYK[0] = input.nextInt();
   }
   //M
   System.out.println("\n\nPlease Enter the 'M' value of the CMYK number.");
   System.out.println("Press Enter after the number has been entered.");
   arrayCMYK[1] = input.nextInt();

   while(arrayCMYK [1] > 100 || arrayCMYK [1] < 0 )
   {
   System.out.println("\n\nError\nPlease Enter the 'M' value of the CMYK number.");
   System.out.println("Press Enter after the number has been entered.");
   arrayCMYK[1] = input.nextInt();
   }
   //Y
   System.out.println("\n\nPlease Enter the 'Y' value of the CMYK number.");
   System.out.println("Press Enter after the number has been entered.");
   arrayCMYK[2] = input.nextInt();

   while(arrayCMYK [2] > 100 || arrayCMYK [2] < 0 )
   {
   System.out.println("\n\nError\nPlease Enter the 'Y' value of the CMYK number.");
   System.out.println("Press Enter after the number has been entered.");
   arrayCMYK[2] = input.nextInt();
   }
   // K
   System.out.println("\n\nPlease Enter the 'K' value of the CMYK number.");
   System.out.println("Press Enter after the number has been entered.");
   arrayCMYK[3] = input.nextInt();

   while(arrayCMYK [3] > 100 || arrayCMYK [3] < 0 )
   {
   System.out.println("\n\nError\nPlease Enter the 'K' value of the CMYK number.");
   System.out.println("Press Enter after the number has been entered.");
   arrayCMYK[3] = input.nextInt();
   }
   return arrayCMYK[4];

Answer 1

數組的索引從0到n-1，因此，在您定義大小為4的數組的情況下，索引將為0、1、2和3。 return arrayCMYK[4];時，索引為0 return arrayCMYK[4]; ，您超出范圍。

Answer 2

數組的索引從零開始，因此

int [] arrayCMYK = new int [4];

索引為0-3

arrayCMYK[4]將為您提供ArrayOutOfBoundsException

Answer 3

該索引4超出范圍：

return arrayCMYK[4];

您定義的arrayCMYK具有4個整數的數組。 因此，有效索引為0、1、2和3。訪問位置4會導致超出范圍的數組異常。

Answer 4

return arrayCMYK[4];

您聲明了一個包含4個元素的數組。 Java中的數組是零索引的。

因此您只能參考0-3