What’s the difference of strings within single or double quotes in groovy?

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Single quotes are a standard 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:

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:

println 'hi $a'            // prints "hi $a"

Also, the link given by julx in their answer is worth reading (esp. the part about GStrings not being Strings about 2/3 of the way down.

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