索引越界异常Java索引：3，大小：3

Question

Hi guys while making a word-puzzle game, I came across a problem in double checking that the vertical and horizontal were both words from my current file that was saved to an arraylist.

 String letterSize = "" + size;
    makeLetterWordList(letterSize);
    boolean finished = false;
    while ( !finished ) {
        finished = true;
        for (int i = 0; i < size; i++) {
            int randomYWord = randomInteger(wordList.size());
            String item = wordList.get(randomYWord);
            puzzleListY.add(item);
        }
        for (int i = 0; i <= puzzleListY.size(); i++) {
            StringBuilder sb = new StringBuilder();
            for (int j = 0; j <= puzzleListY.size(); j++) {
                sb.append(puzzleListY.get(j).charAt(j));
            }
            randomXWord = sb.toString();
            if (!wordList.contains(randomXWord)) {
                finished = false;
                break;
            } else {
                puzzleListX.add(randomXWord);
            }

        }
    }

The error Produced was as follows:

Exception in thread "main" java.lang.IndexOutOfBoundsException: Index: 3, Size: 3
at java.util.ArrayList.rangeCheck(ArrayList.java:653)

I am struggling to find the mistake in my code can anyone assist me?

Answer 1

Loop should be only till size - 1

for (int i = 0; i <= puzzleListY.size(); i++) { // remove =

For other loop as well, Since you are starting from index 0 and there are n elements loop should be from 0 to n-1