是字符'\“与“”相同“ ？（backslash-doublequote vs only-doublequote） [英] Is the char literal '\"' the same as '"' ?(backslash-doublequote vs only-doublequote)

问题描述

char 文字'\'和'之间有任何区别'

Is there's any difference between char literals '\"' and '"' ?

推荐答案

没有什么区别。两个 char 是 == 。

System.out.println('\"' == '"'); // prints "true"

Strictly speaking it's not necessary to escape a double quote in a char literal, but it doesn't change this fact that \" denotes the double quote character \u0022.

严格来说，不必在 char literal，但它不改变这个事实， \表示双引号字符 \\ u0022 。

• JLS 3.10.6 Escape Sequences for Character and String Literals

• JLS 3.10.6字符和字符串字面值的转义序列

We also have the analogous situation for String literals:

我们也有 String 文字的类似情况：

System.out.println("\'".equals("'")); // prints "true"

In fact, we can even go a step further and use == for reference equality:

事实上，我们甚至可以进一步使用 ==

System.out.println("\'" == "'"); // prints "true"

The second snippet proves that the two string literals are really equal, and therefore subject to string interning at compile-time.

第二个片段证明两个字符串文字真的相等，因此subject

• JLS 3.10.5字符串字面值
  
  
  • JLS 3.10.5 String Literals

  
  

  字符串文字 - 或者更常见的是常量表达式的字符串 - 是interned，以便共享唯一的实例，使用方法 String.intern 。

  String literals --or, more generally, strings that are the values of constant expressions-- are "interned" so as to share unique instances, using the method String.intern.





• 如何比较Java中的字符串？


• Java 字符串。等于与 ==


• Java和.NET字符串文字驻留在哪里？


• == s 是 false ，但是。equals（s）是 true


• How do I compare strings in Java?
• Java String.equals versus ==
• Where do Java and .NET string literals reside?
• When "" == s is false but "".equals( s ) is true


• char literal MUST 被转义
  
  
  
  
  • 因为 char 单引号
  
  
  • A single-quote in a char literal MUST be escaped
    • Because char literal is quoted in single-quotes
    
    
    • 因为 String 文字在双引号中引用
    
    
    • Because String literal is quoted in double-quotes
    
    
    • 以最容易阅读的方式阅读
    
    

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