如何在关键短语之间获取字符串的特定部分(java)

public class StringExtractor {
    public static void main(String[] args) {
        String text = "这是一个示例字符串，关键短语A和关键短语B之间的内容是我们需要的。";
        String startPhrase = "关键短语A";
        String endPhrase = "关键短语B";

        String result = extractBetweenPhrases(text, startPhrase, endPhrase);
        System.out.println("提取的内容: " + result);
    }

    public static String extractBetweenPhrases(String text, String startPhrase, String endPhrase) {
        int startIndex = text.indexOf(startPhrase);
        if (startIndex == -1) {
            return "未找到起始短语";
        }
        startIndex += startPhrase.length(); // 移动到起始短语之后

        int endIndex = text.indexOf(endPhrase, startIndex);
        if (endIndex == -1) {
            return "未找到结束短语";
        }

        return text.substring(startIndex, endIndex);
    }
}