Java doesn’t support true closures, even though using an anonymous class like you are using here (new TimerTask() { … }) looks like a kind of closure. edit – See the comments below – the following is not a correct explanation, as KeeperOfTheSoul points out. This is why it doesn’t work: The variables lastPrice and … Read more
In Python, there is a difference between functions and bound methods. >>> def foo(): … print “foo” … >>> class A: … def bar( self ): … print “bar” … >>> a = A() >>> foo <function foo at 0x00A98D70> >>> a.bar <bound method A.bar of <__main__.A instance at 0x00A9BC88>> >>> Bound methods have been … Read more
Difference between @staticmethod and @classmethod
Your translate method won’t work. The problem is here: if word[0] == “a” || “e” || “o” || “u” || “i” and elsif word[0] != “a” || “e” || “o” || “u” || “i” You can’t compare that way as the right side of either will not do what you think it will. Some simple … Read more
Here’s a text (comment) illustrated explanation (both the question and the answer): public Object[] methodA() { // We are method A // In which we create an array Object[] someArrayCreatedInMethodA = new Object[10]; // And we can returned someArrayCreatedInMethodA return someArrayCreatedInMethodA; } public void methodB() { // Here we are inside another method B // … Read more
Java is always pass-by-value. Unfortunately, when we deal with objects we are really dealing with object-handles called references which are passed-by-value as well. This terminology and semantics easily confuse many beginners. It goes like this: public static void main(String[] args) { Dog aDog = new Dog(“Max”); Dog oldDog = aDog; // we pass the object … Read more