.sh

#this is the program
$cat Main.java 
import java.util.stream.*;
import java.nio.file.*;
 
class Main {
    public static void main( String ... args ) throws Exception {
        String s = Files.lines(Paths.get("file.txt")).collect(Collectors.joining("\n"));
        System.out.println(s);
    }
}
#wc -c counts the number of characters in the file
$wc -c file.txt 
      14 file.txt
# od -c shows all the characters in the file (including invisible ones as line endings)
$od -c file.txt 
0000000    h   e   l   l   o  \r  \n   w   o   r   l   d  \r  \n        
0000016
# if we run the program the output is modified
$java Main | wc -c 
      12
# we've got 12 instead of 14
# the \r was stripped
$java Main | od -c 
0000000    h   e   l   l   o  \n   w   o   r   l   d  \n                
0000014