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A class is a type. Classes don't do anything except define the type. You have to instantiate an object of the type in order to actually do anything, including initialising data members. However, the class can define how a data member is initialised. The most efficient method of initialising class members if via the class constructor initialisation list.
What else can I help you with?
Is object a member of a class?
Yes, you would need to define your variables. Also initialize them
Can you declare and define the constructor within class?
Yes, you can declare and define the constructor within a class. A constructor is a special member function of a class that is automatically called when an object of the class is created. It is used to initialize the object's data members. The constructor can be declared and defined within the class definition or can be defined outside the class definition using the scope resolution operator (::).
Can you initialize an object without constructor in java?
No. if you wish to create an object that you plan on using in a java program then the answer is NO. You cannot initialize an object of a Java class without calling the constructor.
Can you access in drive class from base class private data?
Base class should no knowledge about derived classes. The "private" modifier on a data member means private to the class which defined it. Base class cannot directly reference/access the private data member of the derived class, and the derived classes cannot access the private data member defined in the base class. Either way the accessing the private data member should be done via properties or getters
Which base class member functions are not inherited by a derived class?
Derived classes only inherit the protected and public members of their base classes. Private member functions cannot be inherited by a derived class.
Is object a member of a class?
Yes, you would need to define your variables. Also initialize them
Can you declare and define the constructor within class?
Yes, you can declare and define the constructor within a class. A constructor is a special member function of a class that is automatically called when an object of the class is created. It is used to initialize the object's data members. The constructor can be declared and defined within the class definition or can be defined outside the class definition using the scope resolution operator (::).
What function will be called by default to initialize the member variables of the object of the class?
The constructor. It's run each time a new object is created, usually setup to initialize member variables, but it can do most anything.
Can you initialize an object without constructor in java?
No. if you wish to create an object that you plan on using in a java program then the answer is NO. You cannot initialize an object of a Java class without calling the constructor.
Can you access in drive class from base class private data?
Base class should no knowledge about derived classes. The "private" modifier on a data member means private to the class which defined it. Base class cannot directly reference/access the private data member of the derived class, and the derived classes cannot access the private data member defined in the base class. Either way the accessing the private data member should be done via properties or getters
Which base class member functions are not inherited by a derived class?
Derived classes only inherit the protected and public members of their base classes. Private member functions cannot be inherited by a derived class.
What is the difference between initialize of elements in a class with the use of constructor and without use of it?
when initializing a class elements by using constructor it will assigned to the elements when object creation is going on. by using other ways the elements will be initialize with default values when object creation
Can you implement a constructor in private part of code?
no we cannot initialize a constructor in private in order to call a constructor from outside of a class it must be a public member.in order to create an object we should call the constructor .so only private members can implement outside of the class.
Why do you need a constructor as a class member?
A constructor is not a mandatory member that we need to code specifically for a class. While creating a class, even if we miss out coding the constructor, Java would create a default constructor all by itself. The constructor is usually the place where we initialize things that are required by the class. Hence it is a good practice to code the constructor for our class. Tip: If you do not want anyone to instantiate your class, you can declare the constructor as private. In that way no other class can instantiate your class.
Why can't declare construtor as a static final abstract?
Because of the following reasons:static - If a constructor is static, an object instance cannot invoke it to initialize itself (Because static members are not linked to an object)abstract - because an abstract class cannot be instantiated and hence it will not have a constructor. If you make a concrete class's constructor abstract - it cannot be instantiated. eitherways it makes no sensefinal - a constructor cannot be final (thats the way java is designed)
What is conustrutor?
A constructor is a function in C which has the same name of the class. The constructor can be used to initialize some function.
What is a member of a class that cannot be externally used?
There are several different keywords in .Net languages that are used to define the "accessability" of a member or method. For example, in C#, the "private" keyword is used to indicate that this member or method cannot be accessed by any instance of the class, nor by any class that inherits from the class. "Protected" is similar to "private" but allows inherited classes to acces those members. "Internal" allows access to those members freely to any class that is also declared in the same assembly.
