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 to foo foo(aDog); … Read more
No, the structure you found is how Java handles it (that is, with overloading instead of default parameters). For constructors, See Effective Java: Programming Language Guide’s Item 1 tip (Consider static factory methods instead of constructors) if the overloading is getting complicated. For other methods, renaming some cases or using a parameter object can help. This is … Read more
Usage of @see in JavaDoc?
When you write .class after a class name, it references the class literal – java.lang.Class object that represents information about given class. For example, if your class is Print, then Print.class is an object that represents the class Print on runtime. It is the same object that is returned by the getClass() method of any (direct) instance of Print. Print myPrint = new Print(); System.out.println(Print.class.getName()); System.out.println(myPrint.getClass().getName());
This question has been asked before, but even after reading: Java “Get” and “Set” Methods Java Get/Set method returns null And more I still don’t understand how to solve my problem. When accessing variables in a class using get methods from another class I receive the value null. How do I recieve my correct values … Read more
method in class cannot be applied to given types
I found the problem that was causing the HTTP error. In the setFalse() function that is triggered by the Save button my code was trying to submit the form that contained the button. function setFalse(){ document.getElementById(“hasId”).value =”false”; document.deliveryForm.submit(); document.submitForm.submit(); when I remove the document.submitForm.submit(); it works: function setFalse(){ document.getElementById(“hasId”).value =”false”; document.deliveryForm.submit() @Roger Lindsjö Thank you for spotting my error … Read more
What is the difference between a function decorated with @staticmethod and one decorated with @classmethod? 3 33 Maybe a bit of example code will help: Notice the difference in the call signatures of foo, class_foo and static_foo: class A(object): def foo(self, x): print(f”executing foo({self}, {x})”) @classmethod def class_foo(cls, x): print(f”executing class_foo({cls}, {x})”) @staticmethod def static_foo(x): … Read more
Why nextLine() and not nextString() ?
It’s three completely different things: public means that the method is visible and can be called from other objects of other types. Other alternatives are private, protected, package and package-private. See here for more details. static means that the method is associated with the class, not a specific instance (object) of that class. This means that you can call a static method without creating … Read more
