Can Nosotros Declare A Shape Static Inward Java?

The reply to this query is both Yes and No, depending on whether you lot are talking most a exceed score shape or a nested shape inward Java. You cannot brand a exceed score shape static inward Java, the compiler volition non allow it, exactly you lot tin dismiss brand a nested shape static inward Java. Influenza A virus subtype H5N1 exceed score shape is a shape which is non within or thence other class. It may or may non endure world i.e. you lot tin dismiss accept to a greater extent than than i shape inward a Java origin file as well as exclusively needs to endure public, whose cite must endure same equally the cite of the file, residual of the shape or interface on that file may or may non endure public. On the other hand, a nested class is a shape within a exceed score class. It is likewise known equally the inner shape or fellow member shape inward Java.

Now, let's retrieve most what is the pregnant of static class, why would someone desire to brand a shape static inward Java? If you lot are familiar alongside concept of static method as well as static variable inward Java, as well as thence you lot know that anything static tin dismiss endure accessed without creating event of the class.

For example, you lot tin dismiss access the static variable withdraw equally ClassName.variable as well as you lot tin dismiss invoke the static method equally ClassName.staticMethod(), this is a smashing convenience for calling utility method or accessing constants.

This convenience is the primary argue Java programmers similar to declare nested shape equally static inward Java. Remember, Influenza A virus subtype H5N1 nested class, if it's non static as well as thence you lot can't create its event without offset creating an event of the outer class, which is a fleck inconvenient. Such classes are known equally Inner shape as well as they are ever associated alongside an event of outer class.

Nested Static Class inward Java

Influenza A virus subtype H5N1 nested class is genuinely a fellow member of a top-level class, thence it's non much departure alongside a static variable. All instances of the top-level shape volition accept a reference of same nested shape if its static, otherwise each of them volition refer to a different event of nested class.

One of the primary advantages of making a nested shape static is how you lot instantiate it. Suppose you lot declare a nested shape B within a exceed score shape A, as well as thence it would endure referred equally A.B as well as you lot tin dismiss create an event of this shape equally A.B nestedStaticInstance = novel A.B(), dissimilar Testing.B bs = novel Testing(). novel B(); for creating an event of a non-static class, likewise known equally inner class.

So, Yes, you tin dismiss declare a shape static inward Java, provided the shape is within a exceed score class. Such classes are likewise known equally nested classes as well as they tin dismiss endure declared static, exactly if you lot are thinking to brand a exceed score shape static inward Java, as well as thence it's non allowed. If you lot do so, the compiler volition complain saying "illegal modifier for the class, exclusively public, abstract as well as in conclusion are permitted".

Now, let's meet or thence code inward activeness to essay out our point. First, let's endeavor to declare a exceed score shape static inward Java as well as meet if nosotros tin dismiss do it or no.

You tin dismiss meet the compile-time error, it way it is illegal to purpose the static modifier alongside a exceed score shape inward Java. It doesn't affair whether the shape is public or package as well as whether its cite is same equally the cite of the Java origin file. In short, you lot cannot brand a exceed score shape static inward Java i.e. the shape which is non within or thence other class. Here is or thence other example, where I accept tried to brand a non-public exactly exceed score shape static inward Java:

You tin dismiss see, still, the same compile fourth dimension error, "illegal modifier for the class, exclusively public, abstract as well as in conclusion are permitted" is thrown".  If you lot are hearing most nested or inner shape offset time, You should offset read a skilful meat Java mass e.g. Head First Java to acquire to a greater extent than most nested shape inward Java.

Now, let's endeavor to brand a nested class i.e. a shape within the exceed score shape static inward Java. As per theory, you lot tin dismiss declare a nested shape static inward Java, let's meet that inward code.

This fourth dimension at that topographic point is no compiler error, it means you tin dismiss brand a nested shape static inward Java. I accept likewise shown you lot how you lot tin dismiss create an event of the nested static shape inward Java. You tin dismiss see, you lot tin dismiss create an event without creating an event of the outer shape which was non possible with non-static nested class or inner class.

That's all most whether you lot tin dismiss declare a shape static inward Java or not. Of course, you lot cannot brand a exceed score shape static inward Java exactly you lot tin dismiss ever brand a nested shape static inward Java. In fact, it is i of the best usage as well as likewise suggested inward Effective Java to prefer nested static shape instead of non-static inner class.

Other Interesting questions for Java developers

• Can you lot overload or override static method inward Java? (answer)
• Can you lot override a somebody method inward Java? (answer)
• Can you lot run a Java programme without the main() method? (answer)
• Can you lot brand an array volatile inward Java? (answer)
• Can you lot overload or override the primary method inward Java? (answer)
• Can an Abstract shape accept a constructor inward Java? (answer)
• Java Programming Interview Exposed past times Markham (book)

Thanks for reading this article thence far, if you lot genuinely similar this article as well as thence delight part alongside your friends as well as colleagues. If you lot accept whatever question, feedback or proffer as well as thence delight drib a comment as well as I'll endeavor to answer.

Further Learning
SOLID Principles of Object Oriented Design
Absolute Introduction to Object Oriented Programming inward Java
Java - Object Oriented Programming [For Absolute Beginners]

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