Why Can’T A Constructor Be Final?

Can 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..

Which type of constructor can’t have a return type?

No, constructor does not have any return type in Java. Constructor looks like method but it is not. It does not have a return type and its name is same as the class name. Mostly it is used to instantiate the instance variables of a class.

Why constructor has no return type not void?

Constructor is internally a nonstatic method with name and void return type. It does not return anything. … Object is not allocated with constructor itself. In other words the syntax new Object() not only calls the constructor but also creates new object and after calling the constructor returns it.

Can a constructor throw an exception Java?

Yes, constructors are allowed to throw an exception in Java. A Constructor is a special type of a method that is used to initialize the object and it is used to create an object of a class using the new keyword, where an object is also known as an Instance of a class.

Why can’t 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.

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).

Can a constructor be static?

A static constructor does not take access modifiers or have parameters. A class or struct can only have one static constructor. Static constructors cannot be inherited or overloaded. A static constructor cannot be called directly and is only meant to be called by the common language runtime (CLR).

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 abstract class have constructor?

Yes! Abstract classes can have constructors! Yes, when we define a class to be an Abstract Class it cannot be instantiated but that does not mean an Abstract class cannot have a constructor. Each abstract class must have a concrete subclass which will implement the abstract methods of that abstract class.

What is true private constructor?

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

Can a constructor be declared as 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 constructor is not synchronized in Java?

Note that constructors cannot be synchronized — using the synchronized keyword with a constructor is a syntax error. Synchronizing constructors doesn’t make sense, because only the thread that creates an object should have access to it while it is being constructed.

Can we override main method?

No, we cannot override main method of java because a static method cannot be overridden. The static method in java is associated with class whereas the non-static method is associated with an object.

Can constructor declared 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 we synchronize run method in Java?

Yes, we can synchronize a run() method in Java, but it is not required because this method has been executed by a single thread only. … It is good practice to synchronize a non-static method of other class because it is invoked by multiple threads at the same time.

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. All classes have constructors by default: if you do not create a class constructor yourself, Java creates one for you.

Can we override the final method?

You use the final keyword in a method declaration to indicate that the method cannot be overridden by subclasses.

Can a constructor be abstract?

You can’t have an abstract constructor, as abstract means you need to provide the implementation for that at some point of time in your subclass. But you cannot override constructor. There will be no point in having an abstract constructor : Since the constructor needs to be of the same name as of class.

What happens if a user forgets to define a constructor inside a class?

What happens if a user forgets to define a constructor inside a class? Explanation: The C++ compiler always provides a default constructor if one forgets to define a constructor inside a class.

Can you override static method?

Can we Override static methods in java? We can declare static methods with the same signature in the subclass, but it is not considered overriding as there won’t be any run-time polymorphism. Hence the answer is ‘No’.

Can we inherit constructor?

A subclass inherits all the members (fields, methods, and nested classes) from its superclass. Constructors are not members, so they are not inherited by subclasses, but the constructor of the superclass can be invoked from the subclass.