为什么我不能在Java中使用\ u000D和\ u000A作为CR和LF？ [英] Why can't I use \u000D and \u000A as CR and LF in Java?

问题描述

为什么我不能在Java中使用\ u000D和\ u000A作为CR和LF？编译代码时出错：

Why can't I use \u000D and \u000A as CR and LF in Java? It's giving an error when I compile the code:

illegal line end in character literal

推荐答案

在运行编译器之前预先处理Unicode转义。因此，如果您将 \\\ 放在这样的字符串文字中：

Unicode escapes are pre-processed before the compiler is run. Therefore, if you put \u000A in a String literal like this:

String someString = "foo\u000Abar";

它的编译方式与您写的完全相同：

It will be compiled exactly as if you wrote:

String someString = "foo
bar";

坚持 \ r （回车; 0x0D ）和 \ n （换行; 0x0A ）

Stick to \r (carriage return; 0x0D) and \n (line feed; 0x0A)

奖励：您可以随时享受这一点，特别是考虑到大多数语法荧光笔的限制。下次你有一秒，尝试运行这段代码：

Bonus: You can always have fun with this, especially given the limitations on most syntax highlighters. Next time you've got a sec, try running this code:

public class FalseIsTrue {
    public static void main(String[] args) {
        if ( false == true ) { //these characters are magic: \u000a\u007d\u007b
            System.out.println("false is true!");
        }
    }
}

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