Can we overload constructor in derived class?

Since the constructors can't be defined in derived class, it can't be overloaded too, in derived class.

Can we overload derived class?

Like C++, there is no overload resolution between class Base and class Derived. In C#, there is no overloading across scopes derived class scopes are not an exception to this general rule.

Can we overload a constructor?

Constructors can be overloaded in a similar way as function overloading. Overloaded constructors have the same name (name of the class) but the different number of arguments. Depending upon the number and type of arguments passed, the corresponding constructor is called.

Can we override constructor in C++?

No , constructor can never be overridden . It's because constructor acts at class level and it's unique for each class created in Java or any Oop language. Constructor can only be accessed by other classes to create it's object , but cant override it.

Can we overload and override constructor?

Constructor looks like method but it is not. It does not have a return type and its name is same as the class name. But, a constructor cannot be overridden. If you try to write a super class's constructor in the sub class compiler treats it as a method and expects a return type and generates a compile time error.

Buckys C++ Programming Tutorials - 54 - Derived Class Constructors and Destructors

Can constructor be static?

No, we cannot define a static constructor in Java, If we are trying to define a constructor with the static keyword a compile-time error will occur. In general, static means class level. A constructor will be used to assign initial values for the instance variables.

Can constructor have void return type?

Note that the constructor name must match the class name, and it cannot have a return type (like void ). Also note that the constructor is called when the object is created.

Can we declare constructor as private?

Yes, we can declare a constructor as private. If we declare a constructor as private we are not able to create an object of a class. We can use this private constructor in the Singleton Design Pattern.

Can constructor be inherited?

Constructors are not members, so they are not inherited by subclasses, but the constructor of the superclass can be invoked from the subclass.

Can you overload the constructor of the class Java?

Yes! Java supports constructor overloading. In constructor loading, we create multiple constructors with the same name but with different parameters types or with different no of parameters.

Can we overload static method?

Can we overload static methods? The answer is 'Yes'. We can have two or more static methods with the same name, but differences in input parameters.

Can we overload main method?

Yes, we can overload the main method in Java, but When we execute the class JVM starts execution with public static void main(String[] args) method.

Can we overload method in child class?

We can override those methods in the child class. For example, we always override equals , hashCode , and toString from the Object class. If you're interested, you can read more on Why can't we override clone() method from the Object class.

Are overloaded operators inherited in the derived class?

All overloaded operators except assignment (operator=) are inherited by derived classes.

Can a non virtual function be overridden?

By default, methods are non-virtual, and they cannot be overridden. Virtual modifiers cannot be used with static, abstract, private, and override modifiers.

Can constructors be virtual?

In C++, the constructor cannot be virtual, because when a constructor of a class is executed there is no virtual table in the memory, means no virtual pointer defined yet. So, the constructor should always be non-virtual. But virtual destructor is possible.

Can abstract class have constructor?

Like any other classes in Java, abstract classes can have constructors even when they are only called from their concrete subclasses.

Why constructor is private in Singleton?

In singleton class, we use private constructor so that any target class could not instantiate our class directly by calling constructor, however, the object of our singleton class is provided to the target class by calling a static method in which the logic to provide only one object of singleton class is written/ ...

Is public void a constructor?

Constructor is not like any ordinary method or function, it has no return type, thus it does not return void. Constructors don't create objects.

What is true private constructor?

What is true about private constructor? Explanation: Object of private constructor can only be created within class. Private constructor is used in singleton pattern.

Are constructors public in Java?

No, Constructors can be public , private , protected or default (no access modifier at all). Making something private doesn't mean nobody can access it. It just means that nobody outside the class can access it.

Can we declare interface as final?

If you make an interface final, you cannot implement its methods which defies the very purpose of the interfaces. Therefore, you cannot make an interface final in Java. Still if you try to do so, a compile time exception is generated saying “illegal combination of modifiers − interface and final”.

Can we declare main method as final?

Yes, we can declare the main () method as final in Java. The compiler does not throw any error. If we declare any method as final by placing the final keyword then that method becomes the final method. The main use of the final method in Java is they are not overridden.

Can we use this () and super () in a constructor?

If we include “this()” or “super()” inside the constructor, it must be the first statement inside it. “this()” and “super()” cannot be used inside the same constructor, as both cannot be executed at once (both cannot be the first statement). “this” can be passed as an argument in the method and constructor calls.