Groovy中closure的delegate

hello.groovy

import groovy.lang.Closure

Closure clos = { println "Hello closure"}
println "delegate:" + clos.delegate.class.name;
println "owner: " + clos.owner.class.name;

clos.call();

println "==============================="

class C {
	
		Closure clos = {
			
		println this.class.name
		println "delegate:" + delegate.class.name;
		println "owner: " + owner.class.name;	
		
		def nestClos = {
				println "in nest delegate:" + delegate.class.name
				println "in nest owner:" + owner.class.name;
				
		}
		
		nestClos()
		}	
}

def cls = new C().clos;
cls();
println "====== afer reset delegate for outer clos ====="
cls.delegate = this
cls();

delegate:hello
owner: hello
Hello closure
===============================
C
delegate:C
owner: C
in nest delegate:C$_closure1
in nest owner:C$_closure1
====== afer reset delegate for outer clos =====
C
delegate:hello
owner: C
in nest delegate:C$_closure1
in nest owner:C$_closure1