Last Updated: February 25, 2016

Groovy's instanceof

When using @TypeChecked or @CompileStatic, Groovy's instanceof automagically cast the object inside the if block:

import groovy.transform.TypeChecked as TC

@TC class Instanceof {
 static main(args) {
 def foo = new Foo(bar: "bar bar")
 assert new Instanceof().foobar(foo) == "bar bar"
 }

 def foobar(foo) {
 if (foo instanceof Foo) {
 foo.bar // no need to cast :-)
 }
 }
}

@TC class Foo { String bar }

#groovy