Can i instantiate a static class in java

Over 2 million developers have joined DZone. Static Classes in Java. Like 4. Join the DZone community and get the full member experience. Join For Free. A static member can be: static variables, static methods, static block or static initialization block, and, static class Static classes are basically a way of grouping classes together in Java. Synthetic constructs enable Java compilers to implement new Java language features without changes to the JVM.

However, synthetic constructs can vary among different Java compiler implementations, which means that. Consequently, you may have compatibility issues if you serialize an inner class and then deserialize it with a different JRE implementation.

See the section Implicit and Synthetic Parameters in the section Obtaining Names of Method Parameters for more information about the synthetic constructs generated when an inner class is compiled. All rights reserved. Hide TOC. Classes and Objects. Passing Information to a Method or a Constructor. Summary of Creating and Using Classes and Objects. Terminology: Nested classes are divided into two categories: non-static and static.

Non-static nested classes are called inner classes. Nested classes that are declared static are called static nested classes. Note: A static nested class interacts with the instance members of its outer class and other classes just like any other top-level class. This convenience is the main reason Java programmers like to declare a nested class as static in Java.

Remember, A nested class, if it's not static then you can't create its instance without first creating an instance of the outer class, which is a bit inconvenient. Such classes are known as the Inner class and they are always associated with an instance of the outer class. Btw, if you are new to the world of object-oriented programming and design then I also suggest these Software Architecture and Design courses.

It's a great resource to understand the complete process of object-oriented analysis and design for creating quality software. Nested Static Class in Java A nested class is actually a member of a top-level class , so it's not much different from a static variable. All instances of the top-level class will have a reference of the same nested class if it's static , otherwise, each of them will refer to a different instance of the nested class.

One of the main advantages of making a nested class static is how you instantiate it. Suppose you declare a nested class B inside a top-level class A, then it would be referred to as A. B and you can create an instance of this class as A. B , unlike Testing.

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. If you do so, the compiler will complain saying "illegal modifier for the class, only public, abstract and final are permitted". Share to Twitter Share to Facebook. Labels: core java , core java interview question , object oriented programming.

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He might also be confusing static methods with static classes. You cannot just create a static class, as you can see: try to create a new class in eclipse A static class always belongs to the "parent class" which encloses it, and the difference between static and non-static class is: You can refer to the child static class just like a static property of the "parent class": ParentClass. Dai Niu Dai Niu 3 3 silver badges 9 9 bronze badges.

Nested Static class is like a static property of parent class. All the static properties can be accessed with class name directly. Like Someclass. Here we are not using new key word to access static property or static method from parent class.

Then why there is a need for new keyword here. NestedStaticClass " — Gowri Sundar. Sign up or log in Sign up using Google.

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