Is there any way to get the size in bytes of a string in Java?

Question

I need the size in bytes of each line in a file, so I can get a percentage of the file read. I already got the size of the file with file.length(), but how do I get

Answer 1

final String hello_str = "Hello World";

hello_str.getBytes().length is the "byte size", i.e. the number of bytes