split函数采用正则表达式(而不是字符串)进行匹配.您的正则表达式使用特殊字符-在本例中为'$'-因此您需要对其进行更改以转义该字符:

The split function takes a regular expression, not a string, to match. Your regular expression uses a special character - in this case '$' - so you would need to change it to escape that character:

String line = ...
String[] lineData = line.split("\\$");

还请注意，split返回一个字符串数组-字符串是不可变的，因此无法修改.对String所做的任何修改都将以新的String返回，并且原始值将不会更改.因此，上面的lineData = line.split("\\$");.

Also note that split returns an array of strings - Strings are immutable, so they cannot be modified. Any modifications made to the String will be returned in a new String, and the original will not be changed. Hence the lineData = line.split("\\$"); above.