When would you not use a static method
Static methods can't be used for abstraction and inheritance. You can't declare a static method in an interface or static abstract method in an abstract class. A static method cannot access non-static class level members, not its own, nor its base class.
Why not to use static
As static methods don't operate on instance members, there are a few limitations we should be aware of: A static method cannot reference instance member variables directly. A static method cannot call an instance method directly. Subclasses cannot override static methods.
When should we use static and when should we use non static
Static variables are shared among all instances of a class. Non static variables are specific to that instance of a class. Static variable is like a global variable and is available to all methods. Non static variable is like a local variable and they can be accessed through only instance of a class.
Which Cannot be used in static method
The static method cannot use non-static data member or invoke non-static method directly. The this and super cannot be used in static context. The static method can access only static type data (static type instance variable). There is no need to create an object of the class to invoke the static method.
Should you ever use static methods
Static methods are usually preferred when: All instance methods should share a specific piece of code (although you could still have an instance method for that). You want to call method without having to create an instance of that class. You must make sure that the utility class is never changed.
Is static method faster
Static methods are 68 times faster than virtual methods.
Why you should avoid static classes
A stateful static class is the same as a global variable. Changing the state of a static class in one part of the application will affect the behavior of other parts of the application that depend on that state. This is called a side effect and can significantly degrade the maintainability of the application.
Should I avoid using static Java
Overriding a static method is fraught with problems because it creates a semantic nightmare where the method means one thing at one level of the inheritance hierarchy and another at a different level. Overriding of concrete methods should always be avoided.
Which is better static or non static
Binding process
In the static method, the method use compile-time or early binding. For this reason, we can access the static method without creating an instance. In a non-static method, the method use runtime or dynamic binding. So that we cannot access a non-static method without creating an instance.
Where should I use static class
A static class can be used as a convenient container for sets of methods that just operate on input parameters and do not have to get or set any internal instance fields. For example, in the . NET Class Library, the static System.
What Cannot be static in Java
However, it isn't possible to use the static keyword for outer classes or top-level classes. Please note that when you use nested classes, they don't need any sort of reference for outer classes in Java. Also, a nested static class cannot access the members of the outer class that are non-static.
What are the restrictions of static method
Static methodsYou cannot access a non-static member (method or, variable) from a static context.This and super cannot be used in static context.The static method can access only static type data (static type instance variable).You cannot override a static method. you can just hide it.
Why static methods are not thread safe
No, static functions are not inherently thread-safe. Even your simple example isn't. Assuming both intvariable and stringvariable are supposed to be updated at the same time, another thread could observe the state of c1 between the two assignments, leading to data corruption.
Is static faster than dynamic
Because a statically called program is link-edited into the same program object as the calling program, a static call is faster than a dynamic call. A static call is the preferred method if your application does not require the services of the dynamic call.
Which is better static or non-static
Binding process
In the static method, the method use compile-time or early binding. For this reason, we can access the static method without creating an instance. In a non-static method, the method use runtime or dynamic binding. So that we cannot access a non-static method without creating an instance.
Is it bad to use a static class
There is nothing wrong when static class that is used by different part of the application does not have a state and always return deterministic results. This class is stateless, and its output is always predictable. The Math class can be used directly in many parts of the application without the risk of side effects.
What is the disadvantage of static class
Static classes cannot implement an interface. Static classes cannot have any instance members. Static classes can't declare any constructors and the compiler doesn't create a parameterless constructor by default. Static classes are implicitly abstract, you can't add the abstract modifier yourself.
Is it bad to use static classes
Static access causes unexchangeable dependencies to other classes and leads to hard to test code. Avoid using static access at all costs and instead inject dependencies through the constructor. The only case when static access is acceptable is when used for factory methods.
What is the disadvantage of static
Drawbacks of Static Methods
One of the drawbacks is that they cannot be called from the instance method outside of the class in which they are defined. So, if you want to use a static method, you have to call it from another static method itself.
Why static is not used with class
'static' has a meaning when applied to nested classes. It has no meaning on an outer class. So you can't specify it. AFAIK,if it will allow the top level classes to be declared as static class then it will hold the reference in the heap memory all the time even when you are not using it.
Should static classes be avoided
There is nothing wrong when static class that is used by different part of the application does not have a state and always return deterministic results. This class is stateless, and its output is always predictable. The Math class can be used directly in many parts of the application without the risk of side effects.
Why not to use static methods in Java
The use of static fields or methods in good object-oriented programming is rare because they create invariant behaviors at the class level without the benefits of being an object.
Should you avoid static methods in Java
However, they should be used sparingly and only when it makes sense. In general, static methods are best used for utility classes and singletons. Otherwise, it is usually better to create an object of the class and call instance methods on that object.
What are the limitations of static class
Static classes are sealed and therefore cannot be inherited. They cannot inherit from any class or interface except Object. Static classes cannot contain an instance constructor. However, they can contain a static constructor.
Why is static class not allowed
Because the static keyword is meant for providing memory and executing logic without creating Objects, a class does not have a value logic directly, so the static keyword is not allowed for outer class and mainly as mentioned above static can't be used at Package level. It only used within the Class level.
