2.3.1 Whitespace characters
Aside from the line terminator sequence, the ASCII horizontal space character (0x20) is the only whitespace character that appears anywhere in a source file. This implies that:
- All other whitespace characters in string and character literals are escaped.
- Tab characters are not used for indentation.
from: https://google.github.io/styleguide/javaguide.html#s2.3.1-whitespace-characters
에디터나 뷰어에 따라 tab은 달라 보일 수 있기 때문입니다.