GroovyMethodsAsVariables.groovy

class MyClass {
    Closure aMethod

    MyClass() {
        aMethod = {println "Default"}
    }
}
 
def myObject = new MyClass(aMethod: { println "Hello"})
 
print "Original method: "; myObject.aMethod()
 
def oldMethod = myObject.aMethod
 
myObject.aMethod = { println "Goodbye" }
 
print "Overridden method: "; myObject.aMethod()
 
myObject.aMethod = oldMethod
 
print "Restored method: "; myObject.aMethod()