Question: Can Constructor Be Static?

Can you have 2 constructors in Java?

There can be multiple constructors in a class.

However, the parameter list of the constructors should not be same.

This is known as constructor overloading..

Can constructor be static or final?

Automatically a constructor is called when an object of a class is created. It is syntactically similar to a method but it has the same name as its class and a constructor does not have a return type. One of the important property of java constructor is that it can not be final.

Can we override static method?

Can we override a static method? No, we cannot override static methods because method overriding is based on dynamic binding at runtime and the static methods are bonded using static binding at compile time. So, we cannot override static methods.

Why we Cannot 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).

Why can’t a constructor be final?

The child class inherits all the members of the superclass except the constructors. In other words, constructors cannot be inherited in Java therefore you cannot override constructors. So, writing final before constructors makes no sense. Therefore, java does not allow final keyword before a constructor.

What is the difference between static and private constructor in C#?

Static Constructor executes by the CLR not by the object of a class. … However, Private Constructor is used to restrict a class to be instantiated and to be inherited. Private Constructor is used whenever a class contains only static members.

Can constructor be final or static in Java?

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.

Can we have static constructor in non static class in C#?

A non-static class can contain one parameterless static constructor. Parameterized static constructors are not allowed. Static constructor will be executed only once in the lifetime. So, you cannot determine when it will get called in an application if a class is being used at multiple places.

Can we inherit static class?

Creating a static class is therefore basically the same as creating a class that contains only static members and a private constructor. … Static classes are sealed and therefore cannot be inherited. They cannot inherit from any class except Object. Static classes cannot contain an instance constructor.

Can a constructor call another constructor?

Yes, any number of constructors can be present in a class and they can be called by another constructor using this() [Please do not confuse this() constructor call with this keyword]. this() or this(args) should be the first line in the constructor. This is known as constructor overloading.

Can constructor have default arguments?

Like all functions, a constructor can have default arguments. They are used to initialize member objects. … Note that if a constructor has any arguments that do not have default values, it is not a default constructor. The following example defines a class with one constructor and two default constructors.

Is constructor by default final?

No, a constructor can’t be made final. A final method cannot be overridden by any subclasses. As mentioned previously, the final modifier prevents a method from being modified in a subclass.

Why is main method static?

Java main() method is always static, so that compiler can call it without the creation of an object or before the creation of an object of the class. … Static method of a class can be called by using the class name only without creating an object of a class.

Can you use this () and super () both in a constructor?

Because if you use this() and super() together in a constructor it will give compile time error. Because this() and super() must be the first executable statement. If you write this() first than super() will become the second statement and vice-versa. That’s why we can’t use this() and super() together.

Can a constructor be overloaded?

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 a constructor be static in C#?

If we declare a constructor as static, then it will be invoked only once irrespective of the number of class instances and it will be called automatically before the first instance is created. Generally, in c# the static constructor will not accept any access modifiers and parameters.

Why constructor is not overridden?

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.

Can a constructor be 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.

What is method hiding?

Method hiding means subclass has defined a class method with the same signature as a class method in the superclass. In that case the method of superclass is hidden by the subclass. It signifies that : The version of a method that is executed will NOT be determined by the object that is used to invoke it.

Can we inherit constructor?

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