Can constructor have void?

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.

Do constructors have void return type?

Constructors do not have a return type.

Can constructor be overriden?

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 constructor throw an exception?

The short answer to the question “can a constructor throw an exception in Java” is yes!

Can constructor have try catch?

yes we can write a try catch block within a constructor same as we can write in inside a method.

What is the meaning of having void in the constructor definition - C++

Can we declare a constructor 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. The main intention of making a method final would be that the content of the method should not be changed by any outsider.

Can constructor be static?

Java constructor can not be static

One of the important property of java constructor is that it can not be static. We know static keyword belongs to a class rather than the object of a class. A constructor is called when an object of a class is created, so no use of the static constructor.

Can we overload constructor?

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 override constructor?

Constructor overriding is not possible because of following reason. Constructor name must be the same name of class name. In Inheritance practice you need to create two classes with different names hence two constructors must have different names.

Can constructor be void in C++?

Constructor name is same as class name and it doesn't have a return type. You cannot declare a constructor a void as it's a special function that makes different a constructor and a void function.

Can constructor have parameters?

A Java class constructor initializes instances (objects) of that class. Typically, the constructor initializes the fields of the object that need initialization. Java constructors can also take parameters, so fields can be initialized in the object at creation time.

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 a class have 2 constructors?

The technique of having two (or more) constructors in a class is known as constructor overloading. A class can have multiple constructors that differ in the number and/or type of their parameters. It's not, however, possible to have two constructors with the exact same parameters.

Can static method override?

Static methods are bonded at compile time using static binding. Therefore, we cannot override static methods in Java.

Can we create object of abstract class?

We cannot create objects of an abstract class. To implement features of an abstract class, we inherit subclasses from it and create objects of the subclass. A subclass must override all abstract methods of an abstract class. However, if the subclass is declared abstract, it's not mandatory to override abstract methods.

Can constructor be virtual?

In C++, constructor cannot be virtual, because when 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.

Can constructor be Synchronised?

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 constructor return a value?

No, constructor does not return any value.

Can we declare constructor as abstract?

We can declare a constructor with no arguments in an abstract class. It will override the default constructor, and any subclass creation will call it first in the construction chain.

Can we inherit constructor in Java?

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

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.

Can we declare a class as static?

So, Yes, you can declare a class static in Java, provided the class is inside a top-level class. Such clauses are also known as nested classes and they can be declared static, but if you are thinking to make a top-level class static in Java, then it's not allowed.

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

“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.

Can a main () method be declared 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.

Can constructor be overloaded vs overridden?

Neither. Constructors are different from methods. You overload a constructor by writing multiple constructors in the same class, not in inherited classes. And constructors aren't subject to overriding.