private-methods

问题 I'm trying to define a private method for a class to test that such a method can't be called from outside the class. However, I'm coming across an error even when I'm using the syntax as indicated in the Specification. I also checked MDN. Here's the code for my class: class CoffeeMachine { #waterLimit = 200; #checkWater(value) { if (value < 0) throw new Error("Negative water"); if (value > this.#waterLimit) throw new Error("Too much water"); } } Upon calling coffeeMachine.#checkWater(); , I'm

问题 I'm new at Java and I'm attempting on my very first coding, but i hit a bump as in if i type private before data types it will say The value of the field Teacher.tea_id is not used The value of the field Teacher.name is not used Nevertheless, if i removed "private" method then the error also was solved, so i wonder is the method automatically converted to public when i removed "private"? And why error exists with private? Btw, i also have another class namely "score", i'm not sure if i set a

问题 I am a bit confused by this behavior (using python 3.2): class Bar: pass bar = Bar() bar.__cache = None print(vars(bar)) # {'__cache': None} class Foo: def __init__(self): self.__cache = None foo = Foo() print(vars(foo)) # {'_Foo__cache': None} I've read up a bit on how double-underscores cause attribute names to be "mangled", but I would have expected the same name-mangling in both cases above. What is the meaning of a single- and a double-underscore before an object name? Any ideas what's

问题 I'm using Damian Conway's "inside-out" objects as described is his wonderful book Perl Best Practices to construct an object-oriented interface to a security system at my client. I'm coming across the need to use internal helper methods within my module that I would normally designate as "_some_method". However, this seems to break encapsulation since they can be called directly via the package name. Is there any way of making these methods truly private? As an example, use SOD::MyOOInterface

问题 I'm using Damian Conway's "inside-out" objects as described is his wonderful book Perl Best Practices to construct an object-oriented interface to a security system at my client. I'm coming across the need to use internal helper methods within my module that I would normally designate as "_some_method". However, this seems to break encapsulation since they can be called directly via the package name. Is there any way of making these methods truly private? As an example, use SOD::MyOOInterface

问题 This question already has answers here : How do I test a private function or a class that has private methods, fields or inner classes? (51 answers) Closed 2 years ago . I am very new to unit testing and I am a little confused. I am trying to do unit testing (using the Boost unit testing framework) on a C++ class called VariableImpl . Here are the details. class Variable { public: void UpdateStatistics (void) { // compute mean based on m_val and update m_mean; OtherClass::SendData (m_mean); m

问题 I know that private methods are hidden in Derived class and they cant be overridden but my question is different.. Please go through the following problem. My question is mentioned in the problem stated below: TestPolymorphism.java class CheckParent { private void display() { System.out.println("This is parent class"); } } class CheckChild extends CheckParent { void display() { System.out.println("This is child class"); } } public class TestPolymorphism { public static void main(String[] args

问题 This code emits error C2248: 'A::A' : cannot access private member declared in class 'A' in VS2010, although RVO doesn't need a copy constructor. To prove this, just turn public the declaration A(const A&); below, and the code will execute without a problem, even without a definition for the copy constructor . class A { int i; A(const A&); public: A() : i(1) {} }; A f() { return A(); } int main() { A a; a = f(); } 回答1: Just because your program doesn't end up actually invoking the copy

问题 In ObjC, how do I hide implementation a superclass's methods in a subclass? I'm not sure if @private would do the trick, as it appears to only apply to ivars. 回答1: There are no actually "private" methods in Obj-C; since any message can be sent to any object at runtime, there's no way to prevent someone from sending the message you care about. That said, you can intercept that message in the subclass and not handle it. The simplest way to make a superclass's method inaccessible is to override

问题 I'm trying to figure out what is the smartest way to name private methods and private static methods in C#. Background: I know that the best practice for private members is underscore-prefix + camelcase. You could argue this with me, but trust me I've seen enough code from hardcore pros that follow this convention, it is the skilled industry standard. I also know that pascal case is the industry standard for public methods. But I have seen a combination of test style naming (ie. method_must