Yes, an abstract class can have a constructor in Java. You can either explicitly provide a constructor to abstract class or if you don't, the compiler will add default constructor of no argument in abstract class. This is true for all classes and it also applies to an abstract class..
Similarly, it is asked, why does an abstract class have a constructor?
A constructor in Java doesn't actually "build" the object, it is used to initialize fields. Imagine that your abstract class has fields x and y, and that you always want them to be initialized in a certain way, no matter what actual concrete subclass is eventually created.
Secondly, can abstract class have constructor C#? Answer: Yes, an abstract class can have a constructor, even though abstract class cannot be instantiated. An abstract class constructor c# code example will be explained. For example in program, if we create object of derived class then abstract base class constructor will also be called.
Also question is, can abstract class have parameterized constructor in Java?
Yes, an abstract class can have a parameterized constructor. This will then be used by the subclasses that extend the abstract class.
How do you call an abstract class constructor?
You can define a constructor in an abstract class, but you can't construct that object. However, concrete sub-classes can (and must) call one of the constructors defined in the abstract parent class. You can't call an abstract class constructor with a class instance creation expression, i.e.
Related Question Answers
Can constructor be private?
Constructors, like regular methods, can also be declared as private. You may wonder why we need a private constructor since it is only accessible from its own class. When a class needs to prevent the caller from creating objects. Private constructors are suitable.Can a constructor be final?
No Constructors can NEVER be declared as final. Your compiler will always give an error of the type "modifier final not allowed" Final, when applied to methods, means that the method cannot be overridden in a subclass. Constructors are NOT ordinary methods. So there is NO SENSE in declaring it final.Can constructor be static?
constructor is implicitly called to initialize an object, so there is no purpose in having a static constructor. Java does not permit to declare a constructor as static. A constructor always belongs to some object. If a constructor is static, an object of subclass cannot access.Can we create an object for abstract class?
Because it's abstract and an object is concrete. No, designers did not provide a way. Because an abstract class is an incomplete class (incomplete in the sense it contains abstract methods without body and output) we cannot create an instance or object; the same way you say for an interface.Can an abstract class have a final method?
Yes, there may be "final" methods in "abstract" class. But, any "abstract" method in the class can't be declared final. It will give "illegal combination of modifiers: abstract and final" error. Here is the working example of the implementation.Can abstract class have normal methods?
A class that is declared using “abstract” keyword is known as abstract class. It can have abstract methods(methods without body) as well as concrete methods (regular methods with body). An abstract class can not be instantiated, which means you are not allowed to create an object of it.Can we declare an abstract method as static?
An abstract can contain a static method. It is because a static method though not overridden can be hidden. But an abstract method cannot be declared static at the same time as an abstract method must be overridden ans implemented by a subclass's method and declaring it static will prevent overriding.Can we override static method?
Static methods cannot be overridden because they are not dispatched on the object instance at runtime. The compiler decides which method gets called. Static methods can be overloaded (meaning that you can have the same method name for several methods as long as they have different parameter types).Can abstract class have body?
Java Abstract Method Abstract methods are declaration only and it will not have implementation. It will not have a method body. A Java class containing an abstract class must be declared as abstract class. An abstract method can only set a visibility modifier, one of public or protected.Can abstract class have private constructor C#?
A private constructor on an abstract class could only be called by "constructor chaining" from a non-private constructor in the same class. Very little. The public constructor can only be used as a protected one. Yes, it can be called ('sideways') with the this keyword from other (protected/public) constructors.Can abstract class have variables?
An abstract class may contain non-final variables. Type of variables: Abstract class can have final, non-final, static and non-static variables. Interface has only static and final variables. A Java abstract class can have class members like private, protected, etc.Can abstract class have static constructor C#?
If yes, why do we use constructor in abstract class? etc. Answer: Yes, an abstract class can have a constructor, even though abstract class cannot be instantiated. An abstract class constructor c# code example will be explained.Why should I use abstract class?
Java Abstract class can implement interfaces without even providing the implementation of interface methods. Java Abstract class is used to provide common method implementation to all the subclasses or to provide default implementation. We can run abstract class in java like any other class if it has main() method.Can interface class have constructor?
The answer is No, interface cannot have constructors. In order to call any method we need an object since there is no need to have object of interface, there is no need of having constructor in interface (Constructor is being called during creation of object).Can we create static constructor in abstract class?
Answer: Yes, an abstract class can have a constructor. In general, a class constructor is used to initialize fields. Along the same lines, an abstract class constructor is used to initialize fields of the abstract class.Can we inherit abstract class in C#?
An abstract class cannot be inherited by structures. It can contains constructors or destructors. It can implement functions with non-Abstract methods. It cannot support multiple inheritance.What is difference between abstract class and interface in C#?
The main difference between them is that a class can implement more than one interface but can only inherit from one abstract class. Since C# doesn't support multiple inheritance, interfaces are used to implement multiple inheritance.Can abstract class have private methods in C#?
Yes that is fine. A sub-type cannot see private methods, therefore cannot override them: they must be protected (or public etc). There is no such thing as "private to method X" in c#, so it'll have to suffice as-is.Why constructor is used in C#?
The main use of constructors is to initialize private fields of the class while creating an instance for the class. When you have not created a constructor in the class, the compiler will automatically create a default constructor of the class. 
