java - 如何在 StringBuilder 中连接子字符串？

Question

如何将子字符串连接重构为 StringBuilder？

        String line = "this is my start and my end string";
        int start = line.indexOf("start");
        line = line.substring(0, start) + line.substring(start + 5);

        int end = line.indexOf("end");
        line = line.substring(0, end) + line.substring(end + 3);
            //result: this is my and my string";

使用 StringBuilder 时，相同的代码会是什么样子？当我想一个接一个地多次执行子串时？

Answer 1

如果您的问题是“如何从字符串中重复删除子字符串”，您可以尝试这样的操作:

StringBuilder line = new StringBuilder("this is my start and my end string");
int start = line.indexOf("start");
line.delete(start, start + 5);
int end = line.indexOf("end");
line.delete(end, end + 3);
String result = sb.toString()

创建 StringBuilder 一次，然后操作其内容。