如何在java中更改为StringBuilder

Question

我正在尝试将以下代码更改为StringBuilder以便我可以格式化ArrayList的输出，我该怎么做。

 private static String createFormattedList(List<List<String>> failureList) {
    String lineBreak = "</br>";
    String result = "";
    for (List<String> failure : failureList) {

        for (String item : failure) {
            result += item + lineBreak;
        }
        result += lineBreak;

    }

    return result;
}

Answer 1

使用以下代码：

private static String createFormattedList(List<List<String>> failureList) {
    String lineBreak = "</br>";
    StringBuilder result = new StringBuilder();
    for (List<String> failure : failureList) {
        for (String item : failure) {
            result.append(item).append(lineBreak);
        }
        result.append(lineBreak);
    }
    return result.toString();
}