string groovy中单引号或双引号内的字符串有什么区别？
声明：本页面是StackOverFlow热门问题的中英对照翻译，遵循CC BY-SA 4.0协议，如果您需要使用它，必须同样遵循CC BY-SA许可，注明原文地址和作者信息，同时你必须将它归于原作者（不是我）：StackOverFlow
原文地址: http://stackoverflow.com/questions/6761498/
Warning: these are provided under cc-by-sa 4.0 license. You are free to use/share it, But you must attribute it to the original authors (not me):
StackOverFlow
What's the difference of strings within single or double quotes in groovy?
提问by Freewind
def a = "a string"
def b = 'another'
Is there any difference? Or just like javascript to let's input 'and "easier in strings?
有什么区别吗？或者就像 javascript 让我们在字符串中输入'和"更容易？
回答by tim_yates
Single quotes are a standard java String
单引号是标准的java String
Double quotes are a templatable String, which will either return a GString if it is templated, or else a standard Java String. For example:
双引号是一个可模板化的字符串，如果它是模板化的，它将返回一个 GString，否则将返回一个标准的 Java 字符串。例如：
println 'hi'.class.name // prints java.lang.String
println "hi".class.name // prints java.lang.String
def a = 'Freewind'
println "hi $a" // prints "hi Freewind"
println "hi $a".class.name // prints org.codehaus.groovy.runtime.GStringImpl
If you try templating with single quoted strings, it doesn't do anything, so:
如果您尝试使用单引号字符串进行模板化，它不会执行任何操作，因此：
println 'hi $a' // prints "hi $a"
Also, the link given by julkiewicz in their answeris worth reading (esp. the part about GStrings not being Strings about 2/3 of the way down.
此外，julkiewicz 在他们的回答中给出的链接值得一读（特别是关于 GStrings 的部分不是字符串大约 2/3。
回答by julx
My understanding is that double-quoted string may contain embedded references to variables and other expressions. For example: "Hello $name", "Hello ${some-expression-here}". In this case a GStringwill be instantiated instead of a regular String. On the other hand single-quoted strings do not support this syntax and always result in a plain String. More on the topic here:
我的理解是双引号字符串可能包含对变量和其他表达式的嵌入引用。例如："Hello $name"，"Hello ${some-expression-here}"。在这种情况下， aGString将被实例化而不是常规String。另一方面，单引号字符串不支持这种语法，并且总是导致一个普通的String. 更多关于这里的主题：
http://docs.groovy-lang.org/latest/html/documentation/index.html#all-strings
http://docs.groovy-lang.org/latest/html/documentation/index.html#all-strings
