Can constructor be static?

Can constructor be static?

Can constructor be static?

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. ... A constructor will be used to assign initial values for the instance variables. Both static and constructor are different and opposite to each other.

Why are constructors not static?

So constructor is not static. The method declared as static requires no object creation . As we don't create object for the main method it is declared as static. constructor is implicitly called to initialize an object, so there is no purpose in having a static constructor.

Can you override static methods?

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 we have static class?

The answer is YES, we can have static class in java. In java, we have static instance variables as well as static methods and also static block. Classes can also be made static in Java. In java, we can't make Top-level (outer) class static.

Can constructor be private or static?

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.

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. ... So, the compiler needs to call the main() method. If the main() is allowed to be non-static, then while calling the main() method JVM has to instantiate its class.

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. ... Therefore, it is not possible to override the main method in java.

Can a constructor in Java not be final, static?

Constructor needs to have a body and implementation, so there is no sense in making them abstract. The fact is constructors are implicitly final and static, you don’t need to declare it again. As far as synchronization is concerned, again it cannot be implemented on constructors.

When to initialize a static final field in the constructor?

static final variables are initialized when the class is loaded. The constructor may be called much later, or not at all. Also, the constructor will be called multiple times (with each new object ), so the field could no longer be final. Ok, but you just explained what is happening. I am asking why ?

What's the difference between a constructor and a final?

final is used for fixing , avoid overriding and inheriting. Constructor cannot be final, because it can’t be inherited/overridden. static is used for memory management, it means same variable or method will be shared between all instances of a class.

Can a constructor be an abstract constructor in Java?

a constructor cannot be abstract, static, final, native, strictfp, or synchronized. A constructor is not inherited, so there is no need to declare it final and an abstract constructor could never be implemented. A constructor is always invoked with respect to an object, so it makes no sense for a constructor to be static.


Related Posts: