2016年1月5日 · The following code examples all produce the same results where x evaluates to true according to Groovy Truth // These three code snippets mean the same thing. // If x is true according to groovy truth return x else return y x ?: y x ? x : y // Standard ternary operator.

2019年3月11日 · In Groovy you also have to be aware that in addition to ==~, alias "Match operator", there is also =~, alias "Find Operator" and ~, alias "Pattern operator". All are explained here. ==~ result type: Boolean/boolean (there are no primitives in Groovy, all is not what it seems!) =~ result type: java.util.regex.Matcher ~ result type: java.util ...

2017年9月6日 · While reading some groovy code of another developer I encountered the following definition: def foo=[:] What does it mean?

Groovy adds the execute method to String to make executing shells fairly easy; println "ls".execute().text ...

In groovy, the bitwise operators can be overridden with the leftShift (<<) and rightShift (>>) methods defined on the class. It's idiomatic groovy to use the leftShift method for append actions on strings, buffers, streams, arrays, etc and thats what you're seeing here.

2010年6月7日 · In examples of groovy code I find the -&gt; operator everywhere, but the groovy tutorials nor the book I have seem to provide any explaination as to what this means.

2013年5月8日 · I use it all the time. EDIT: Just looking at it they are slightly different--split returns an array while tokenize returns an ArrayList. Virtually the same thing in Groovy, the split has the advantage that it ports easily to Java, I don't think tokenize is a java method on String (unless it's a fairly new one and I missed it) –

2017年4月12日 · In groovy a == b checks first for a compareTo method and uses a.compareTo(b) == 0 if a compareTo method exists. Otherwise it will use equals . Since Strings and GStrings implement Comparable there is a compareTo method available.

"this" in a block mean in Groovy always (be it a normal Java-like block or a Closure) the surrounding class (instance). "owner" is a property of the Closure and points to the embedding object, which is either a class (instance), and then then same as "this", or another Closure. I would forget about the scope thing totally for this part.

2014年1月25日 · .equals() does not behave the same in Groovy as it does in Java. Example here-- scroll down to 'GString and String'. Basically both items have to be of the same type of String class. Since the String class is implicit in the assignment -- GString is a Groovy language construct and String is an inline definition, something like def foo = "foo"...