Illegal mode "num" must be one of "r", "rw", "rws", or "rwd"是什么意思

这个错误消息 "Illegal mode "num" must be one of "r", "rw", "rws", or "rwd"" 是指在使用 RandomAccessFile 类时传入了无效的文件打开模式。在 Java 的 RandomAccessFile 类中，打开文件的模式应该是 "r"、"rw"、"rws" 或 "rwd" 中的一个。如果给定的模式不是这些值之一，则会抛出该错误。这个错误通常表示代码中传入的文件打开模式有误，需要检查代码中传递的参数是否正确。

相关问题

Illegal type String of 1 argument of function formatDateTime. Should be a date or a date with time

This error message is indicating that the argument provided to the function formatDateTime is of type String, which is not a valid input. The argument should be a date or a date with time.

To fix this error, you should ensure that the argument passed to the function is either a date or a date with time, rather than a string. You can do this by converting the string to a date or by ensuring that the input is in the correct format before passing it to the function.

For example, if you have a string representing a date in the format "YYYY-MM-DD", you could convert it to a date object using the following code:

var dateString = "2022-01-01";
var dateObject = new Date(dateString);

Once you have a date object, you can pass it to the formatDateTime function as an argument:

var formattedDate = formatDateTime(dateObject);

Alternatively, if you have a string representing a date and time in a specific format, you could use a library like Moment.js to parse the string and convert it to a date object before passing it to the formatDateTime function:

var dateString = "2022-01-01 12:00:00";
var dateObject = moment(dateString, "YYYY-MM-DD HH:mm:ss").toDate();
var formattedDate = formatDateTime(dateObject);

By ensuring that the argument passed to the formatDateTime function is a valid date or date with time, you should be able to avoid the "Illegal type String" error.

报错Error: Error: Illegal argument: line must be non-negative

这个错误信息表示你的代码传入了一个非法的参数，这个参数的值是一个负数。这通常是因为你在代码中提供了一个无效的输入，或者你的代码中存在一些逻辑错误，导致了这个错误的出现。

要解决这个问题，你需要检查你的代码，确保所有的参数都是有效的，并且不会传入负数。如果你不确定哪里出了问题，你可以尝试使用调试工具来帮助你找到错误的地方。