Question

错误：java.lang.IndexOutOfBoundsException：索引70无效，大小为10;

我已经创建了一个函数来创建随机的Integer ArrayList，并用它做一些操作，现在我试图让它适应Chars，我得到了奇怪的错误，因为在我看来，默认的字符数组大小更大然后整数一个，但我不确定。我可以用这个代码做什么？功能在此处失败：numbers.set(rightNumbers.get(k),answer.charAt(k));

 @Override
    public void charactersRandomise(String answer) {
        final String alphabet = "ABSDEFGHMN";
        final int N = alphabet.length();
        ArrayList<Character> numbers = new ArrayList<Character>();
        ArrayList<Character> rightNumbers = new ArrayList<Character>();
        Random randomGenerator = new Random();
        int i=0;
        Log.d("size",String.valueOf(N));
        while (numbers.size() < 10) {

            char random = alphabet.charAt(randomGenerator.nextInt(N));
            if (!numbers.contains(random)) {
                numbers.add(random);
                Log.d("numbers", numbers.get(i).toString());
                i++;
            }
        }
        int j=0;
        while (rightNumbers.size() < answer.length()) {
            char random = alphabet.charAt(randomGenerator.nextInt(N));
            if (!rightNumbers.contains(random)) {
                rightNumbers.add(random);
                Log.d("RightNumbers",rightNumbers.get(j).toString());
                j++;
            }
        }
        for(int k =0;k<rightNumbers.size();k++){
            numbers.set(rightNumbers.get(k),answer.charAt(k));
            Log.d(rightNumbers.get(k)+"", numbers.get(rightNumbers.get(k)).toString());
        }
        for (int h=0;h<numbers.size()-1;h++) {
            Log.d("newNumber", String.valueOf(numbers.get(h)));
        }
        for(int m=0;m<buttons.length;m++){
            buttons[m].setText(numbers.get(m) + "");
        }
    }

Answer 1

numbers.set(rightNumbers.get(k),answer.charAt(k)); - 此表达式rightNumbers.get(k)检索一个字符。在ASCII中，这个字符（我可以看到它是F）被转换为int中的数字70，这就是异常发生的原因。

将其替换为：

numbers.set(k ,answer.charAt(k));

Character ArrayList outOfBounds异常

1 个答案: