If we declare a constructor as static, then it can not be accessed by its subclasses and will belong to a class level only. Thus, it will violate the whole motive of the inheritance concept. So, it is illegal to declare a constructor as static. But, when we declare it as static, it can not be used by its subclasses other than the declaring classes. In the case of a constructor, a constructor is a reusable block of code, which means we can call it from its subclasses during the creation of the objects. Similarly, we can not use a static variable in its subclasses. Static methods can not be inherited from their subclasses because they belong to the class in which they are declared. When we mark anything with a static keyword, it belongs to class only, for example, static method, static variable, etc. Why does Java not Support a Static Constructor? And it is clearly written that public, protected, & private are permitted. (StaticConstructorDemo.java:4)Īt StaticConstructorDemo.main(StaticConstructorDemo.java:13)įrom the above example, we can see, it is throwing an exception " Illegal modifier for the constructor type". Illegal modifier for the constructor in type StaticConstructorDemo only public, protected & private are permitted.Īt StaticConstructorDemo. Consider the below example:Įxception in thread "main" : Unresolved compilation problem:
So, the Java program will not be compiled and throw a compile-time error. It is illegal and against the Java standards to use a static constructor. Let's understand why the static constructor is not allowed in Java: What if We Declare a Static Constructor?Ī static constructor is not allowed in Java programming. If the value of static fields is not initialized, it will initialize to default values.It is invoked automatically, can not be called directly or explicitly.It does not allow inheritance or overloading.A specific class can have only one static constructor.It will not take parameters or access modifiers.Some key features of the static constructor are as follows: However, the static constructor is not allowed in Java. The static constructor is explicitly declared by using a static keyword.
#Static constructor java full
Usually, a static constructor is automatically called when the first instance is generated, or any static member is referenced. All about Constructors in Java - Full tutorial with concrete examples.In Java, constructors are used to create new objects. So, there is no static constructor in Java.Ī static constructor used to initialize static data means the specified task will execute only once throughout the program.
#Static constructor java code
In Java, a static block is a package of instructions meant to run only once, while a constructor is a code that runs each. In Java, a constructor is not allowed to be abstract, final, static, native, or strictfp. He is an adjunct professor of computer science and computer programming.
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