Groovy Class tricks

jwagon sent me these mind bending groovy class manipulations in a chat today:

#!/usr/bin/env groovy

class AA { 
        def msg
        AA(something){ msg = something } 
    }

def c = { a, b -> 
 def  x =a.newInstance(b)
 println x.msg
}

c(AA, "foo")

Or how about....

#!/usr/bin/env groovy
def m = java.lang.String
def n =  m.newInstance("foo")
println n