Daily LeetCode – day0040 1592. Rearrange Spaces Between Words

// 1592. Rearrange Spaces Between Words
class Solution {
    public String reorderSpaces(String text) {
        int spaceQuantity = 0;
        char[] chars = text.toCharArray();
        for (char c : chars) {
            if (c == ' ') {
                ++spaceQuantity;
            }
        }
        String[] strings = text.split("\\s+");
        ArrayList<String> arrayList = new ArrayList<>();
        for (String s : strings) {
            if (!s.equals("")) {
                arrayList.add(s);
            }
        }
        int wordQuantity = arrayList.size();
        StringBuilder spaces = new StringBuilder();
        StringBuilder ans = new StringBuilder();
        if (wordQuantity == 1) {
            ans.append(arrayList.get(0));
            for (int i = 0; i < spaceQuantity; ++i) {
                ans.append(' ');
            }
        } else {
            for (int i = 0; i < spaceQuantity / (wordQuantity - 1); ++i) {
                spaces.append(' ');
            }
            for (int i = 0; i < arrayList.size() - 1; ++i) {
                ans.append(arrayList.get(i));
                ans.append(spaces);
            }
            ans.append(arrayList.get(arrayList.size() - 1));
            for (int i = 0; i < spaceQuantity % (wordQuantity - 1); ++i) {
                ans.append(' ');
            }
        }
        return ans.toString();
    }
}

学习笔记：
这是一道简单的字符串题目。
这道题还是错了两次，如果只有一个单词的话，wordQuantity - 1就会变成0，会出现ZeroDivisionError，这个的确需要注意。