This Java tutorial may be of some use to you. Modifier | Class | Package | Subclass | World public | Y | Y | Y | Y protected | Y | Y | Y | N no modifier | Y | Y | N | N private | Y | N | N | … Read more
I thought its access modifier is public, but when I deal with a inner class issue, I found maybe I was wrong. Yup. Indeed, I found myself in the same situation a couple of years ago. I was surprised by an error (through Guice injection, which made it slightly harder to find). The key is … Read more
class A { public: int x; protected: int y; private: int z; }; class B : public A { // x is public // y is protected // z is not accessible from B }; class C : protected A { // x is protected // y is protected // z is not accessible from … Read more
You want public inheritance: class Weapon : Shopable should be: class Weapon : public Shopable Also, names like _SHOPABLE_H_ are illegal in user written C++ code, as they are reserved for the C++ implementation. Forget the leading underscores and use SHOPABLE_H. And: Weapon(int Cost,int Damage,std::string Name) should be: Weapon(int Cost,int Damage, const std::string & Name … Read more
You cannot initialize m_data in the derived class constructor but instead pass it as an argument to the base class constructor. That is: DerivedClass::DerivedClass(std::string data) : BaseClass(data) { }
It’s the interface itself that can be package-private, not the methods in it. You can define an interface that can only be used (by name) within the package it’s defined in, but its methods are public like all interface methods. If a class implements that interface, the methods it defines must be public. The key … Read more
If the InnerEvenIterator class does not extend any class or implement any interface, I think it is nonsense because no other class can access any instance of it. However, if it extends or implements any other non private class or interface, it makes sense. An example: interface EvenIterator { public boolean hasNext(); } public class … Read more
Public – can be called from anywhere Private – The method cannot be called outside class scope. The object can only send the message to itself ex: the baker has bake method as public but break_eggs is private Protected – You can call an object’s protected methods as long as the default object self is … Read more
“access modifier” is the official term for private, protected and public used in the Java language specification. “access specifier” is used synonymously in the Java API doc, but this is the first time I’ve noticed that. It’s probably better to stick with the JLS term.
No. Signals cannot be public or private. Qt signals are protected class methods. “signals” keyword is defined in qobjectdefs.h (line 69 as for Qt 4.6.1): # define signals protected UPDATE: signals are only protected upto and including all minor versions of Qt 4. From Qt 5.0 onwards they are public. See https://stackoverflow.com/a/19130831.