java - 如图，a.txt文件开头什么都没有，FileInputstream读取的时候为什么还会出现乱码？

Question

Answer 1

If you are windows平台开发，建议使用nodepad++，并选择以UTF-8无BOM格式编码

Answer 2

may be invisible characters

Answer 3

Try saving the file as utf-8 format

Answer 4

Is there a BOM head

Answer 5

This problem may occur when you use Notepad or the like to save files under Windows. Notepad automatically inserts three invisible bytes 0xEF 0xBB 0xBF, generally called the BOM header.

You can output these three bytes as hexadecimal or decimal to see if they are these three numbers