What's the difference between '' vs "" in build.gradle of Gradle?

Question

Compare the:

compile 'org.apache.commons:commons-lang3:3.6'
compile "org.apache.commons:commons-lang3:3.6"

I used to use the '' in my build.gradle because it's simpler than "" and ("").

However I found the extra variables not work using '', for example,

Gradle is unable to resolve :

compile 'org.apache.commons:commons-lang3:$versions.commonsLang',

compile "org.apache.commons:commons-lang3:$versions.commonsLang" is working.

score 5 · Accepted Answer · answered Sep 15 '17 at 10:32

' (single quote) are used for standard java String whereas " (double quote) will be evaluated to GString if it has $ expression or to plain String it it hasn't.

Since gradle scripts (in this particular case) are written in groovy have a look at the docs also.

score 2 · Answer 2 · answered Sep 15 '17 at 10:31

2

As you've noticed, " allows for variable interpolation / expansion inside the string, while ' does not. It is considered good practive to use ' if variable interpolation is not required, e.g. for performance reasons as the compiler does not need to parse the string for variable names then.

answered Sep 15 '17 at 10:31

sschuberth

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compiler performance?! – tim_yates Sep 15 '17 at 10:57
Well, parser, if you prefer. But yes, I like micro-optimizations :-D – sschuberth Sep 15 '17 at 11:00
1

I think even _"micro"_ is a couple of sizes too big... what's below "nano-optimization"? ;-P – tim_yates Sep 15 '17 at 11:04

What's the difference between '' vs "" in build.gradle of Gradle?

2 Answers2