是什么导致此循环超出范围？

Question

I'm writing a word find game and can't find why the while loop is giving me ArrayIndexOutOfBounds error. The error says it is in this line: grid[i-1][j-1]=kb.next(); but I can't see why?

Answer 1

(You should have posted your code) but, your while loop is going till:

while(i<=height) 

and

while(i<=widht)

They should be

while(i < height) and while(i < width)

Since the array index starts with 0 and will continue to Length - 1 , (Also you need to reset j value after coming out of inner loop)

Answer 2

It's a simple logic error. You are not resetting the value of j after you come out of while loop (j <= width). As a result for next value of i the value of j starts from the last possible index value and not from 0.

Reset j to 1 everytime you come increment value of i after while loop.

Answer 3

Looping over 1 to width (or height) is fine, if not standard practice, since you index with [i-1] or [j-1].

What your screen capture doesn't show is what the user (you, I assume) entered for "Enter width of grid". Was it the same number for each, or different? Did you get the first and second indexes switched around?