Using a BackSlash in Java [duplicate]

问题:

This question already has answers here:

What is the backslash character (\\)? (6 answers)

Closed 4 years ago.

I want to print out a backslash. However, I get an error:

//Invalid escape sequence (valid ones are \b \t \n \f \r \" \' \\ )
System.out.println("\");

回答1:

System.out.println("\\");

\ will escape the second \ character.