Can constructor be static or final?

From the above example also it is clear that if we are defining constructor as final the compiler will give an error as modifier final not allowed. 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.

Can a constructor be static?

A static constructor is used to initialize any static data, or to perform a particular action that needs to be performed only once. It is called automatically before the first instance is created or any static members are referenced.

Can you make constructor as final?

declaring constructor as final

In other words, constructors cannot be inherited in Java, therefore, you cannot override constructors. So, writing final before constructors make no sense. Therefore, java does not allow final keyword before a constructor.

Is constructor static or non static?

Constructor is static because: It is helping to create object. It is called without object.

Can final static be initialized in constructor?

If you declare a static variable in a class, if you haven't initialized it, just like with instance variables compiler initializes these with default values in the default constructor. Yes, you can also initialize these values using the constructor.

Can a Constructor be static in Java ?

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.

Can we overload 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 constructor be static in Java?

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.

Is constructor called before static method?

No, the constructor doesn't run if you only call a static method of a class. There is no instance of a class associated with a call to a static method.

Can 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. We can use this private constructor in the Singleton Design Pattern.

Can we use constructor as final in Java?

Java constructor can not be final

One of the important property of java constructor is that it can not be final. As we know, constructors are not inherited in java. Therefore, constructors are not subject to hiding or overriding.

Can a constructor be static in C++?

The purpose of a constructor is to initialize the contents of an instance of the class. Static methods don't have an instance associated with them. Hence there is no such thing as a static constructor. Well C++ could define static constructor the same way that C# does or Java with static initialization blocks.

Can static method be overridden?

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

Why are constructors not static?

Conclusion: The constructors in Java can not be static because if the constructors are marked as static, they can not be called from the child class; thus, the child class's object will not be created. The program will not be compiled and throw a compile-time error.

Can constructor be 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.

Why a constructor can not be final static or abstract in Java?

A Java constructor is implicitly final, the static / non-static aspects of its semantics are implicit¹, and it is meaningless for a Java constructor to be abstract. This means that the final and static modifiers would be redundant, and the abstract keyword would have no meaning at all.

Can we call constructor from static method?

Static method cannot cannot call non-static methods. Constructors are kind of a method with no return type.

Can constructor be 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 we have constructor in abstract class?

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

Can a constructor be virtual?

Constructor can not be virtual, because when constructor of a class is executed there is no vtable in the memory, means no virtual pointer defined yet.

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 a constructor be synchronized?

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. While declaring a constructor you will not have anything like return type. In general, Constructor is implicitly called at the time of instantiation. And it is not a method, its sole purpose is to initialize the instance variables.

Can we have two constructors in a class?

A class can have multiple constructors that assign the fields in different ways. Sometimes it's beneficial to specify every aspect of an object's data by assigning parameters to the fields, but other times it might be appropriate to define only one or a few.

Can we override main method in Java?

No, we cannot override main method of java because a static method cannot be overridden.