java - 基于Java语言规范对String Literal的澄清

Question

在Java语言规范中有提到

A string literal is always of type String (§4.3.3). It is a compile-time error for a line terminator to appear after the opening " and before the closing matching ".

As specified in §3.4, the characters CR and LF are never an InputCharacter; each is recognized as constituting a LineTerminator.

但是我可以创建并运行下面的语句

 public class StringOperation {
        public static void main(String ...args){
            String first = "\n";
            System.out.println(first);
        }

    }

而且我没有看到任何错误。感谢您的所有见解。

Answer 1

语法 "\n" 是行终止符的有效转义表示，而不是实际的行终止符。 JLS 阻止你做这样的事情:

String alphabet = "abcdefghijklm
   nopqrstuvwxyz";

相反，你必须这样做:

String alphabet = "abcdefghijklm" +
    "nopqrstuvwxyz";