Your guess is correct – you understand how classmethods work. The why is that these methods can be called both on an instance OR on the class (in both cases, the class object will be passed as the first argument): class Dummy(object): @classmethod def some_function(cls,*args,**kwargs): print cls #both of these will have exactly the same … Read more
Basically performSelector allows you to dynamically determine which selector to call a selector on the given object. In other words the selector need not be determined before runtime. Thus even though these are equivalent: [anObject aMethod]; [anObject performSelector:@selector(aMethod)]; The second form allows you to do this: SEL aSelector = findTheAppropriateSelectorForTheCurrentSituation(); [anObject performSelector: aSelector]; before you … Read more
Which version of Java are you using? With 1.6.0_11 the code (pasted below) compiles and runs. I am sure its obvious why foo(testVal) goes to foo(Object). The reason why foo(null) goes to foo(String) is a little complex. The constant null is of type nulltype, which is a subtype of all types. So, this nulltype extends … Read more