data.append(line).append("\r\n");

这段代码有语法错误，因为 `append()` 方法返回的是 `None`，所以不能再次调用 `append()` 方法。如果你想在 `data` 列表中添加一个字符串和换行符，可以使用以下代码：

data.append(line + '\r\n')

或者使用 `f-string` 来拼接字符串：

data.append(f"{line}\r\n")

其中，`\r\n` 表示 Windows 操作系统下的换行符。如果你在 Linux 或 macOS 系统下运行代码，可以将 `\r\n` 改为 `\n`。

相关问题

while ((line = in.readLine()) != null) { data.append(line).append("\r\n"); }

这是一个读取输入流的代码片段，它使用了一个 while 循环不断读取输入流中的每一行数据，并将其存储到一个 StringBuilder 对象中。当输入流中的数据被全部读取完毕时，in.readLine() 方法将返回 null，此时 while 循环结束。这段代码还在每一行数据的末尾添加了一个换行符 "\r\n"，以便于在后续的处理中区分每一行数据。

data.append(line.replace("\n", " "))

As an AI language model, I do not have access to the context in which this line of code is being used. However, based on the syntax of the line, it seems to be appending a modified version of a string (stored in the variable `line`) to a list called `data`.

The `replace()` method is used to remove any newline characters (`\n`) from the end of the string, replacing them with a space character. This modified string is then added to the `data` list using the `append()` method.

Overall, it appears that this code is part of a program that is reading data from a file and storing it in a list, with each line of the file being stored as a separate element in the list.