Can we declare local variable as static?

you cannot have a static local variable , but you can use instance variables or class variables. If you have your method as static which by default creates a copy of this method to all the objects and cant be broken down any further as local variables limit their access only to the method in which they reside.

Can I declare local variable as static?

In Java, a static variable is a class variable (for whole class). So if we have static local variable (a variable with scope limited to function), it violates the purpose of static. Hence compiler does not allow static local variable.

What would happen if we declared a local variable as static local?

When applied to a local variable, the static keyword defines the local variable as having static duration, meaning the variable will only be created once, and will not be destroyed until the end of the program.

Can we use static for local variable in Java?

Unlike C, C++, Java does not allow static local variables.

Why local variables are not static?

A local variable scope is within the method where it is declared. If the local variable is declared static, the meaning of static is lost. If the local variable is static, the purpose of static variable is bypassed. For this reason, compiler does not allow static local variables.

Can we declare local variable as static? || Java interview Questions(2021)

Can we declare local variable as final?

final is the only allowed access modifier for local variables. final local variable is not required to be initialized during declaration. final local variable allows compiler to generate an optimized code. final local variable can be used by anonymous inner class or in anonymous methods.

Can constructor be static?

Java constructor can not be static

One of the important property of java constructor is that it can not be static. We know static keyword belongs to a class rather than the object of a class. A constructor is called when an object of a class is created, so no use of the static constructor.

Why we can declare local variable as static in Java?

Static variables in methods

The variables with in a method are local variables and their scope lies within the method and they get destroyed after the method execution. i.e. you cannot use a local variable outside the current method which contradicts with the definition of class/static variable.

Why main () method is declared as static?

Why the main () method in Java is always 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. In any Java program, the main() method is the starting point from where compiler starts program execution.

Can we override static method?

No, we cannot override static methods because method overriding is based on dynamic binding at runtime and the static methods are bonded using static binding at compile time. So, we cannot override static methods.

Can we make global variable static?

A static global variable is a global variable that can only be accessed by functions in the same C program file as the variable. Explanation: The static global variable x can only be access within File 2. The main() function is not stored in the same file !

Are static local variables bad?

No. Static local variables differ in exactly one regard to non-local private variables: they have a smaller scope. Since you always want to keep scope as small as possible (= better encapsulation), local statics can be advantageous over private variables.

When should a static local variable be used?

Static local variables are useful when we want to have only one instance of our object in the local scope, which means all calls to the function will share the same object. The same can also be achieved by using global variables or static member variables.

Can we call static variable in static method?

You can not declare varibale as static inside a method. Inside method all variables are local variables that has no existance outside this method thats why they cann't be static.

Is extern a local variable?

The answer is yes. scope (visibility) and storage are two independent and connected concept. Here, x is one local variable (scope), and it's only visible within this block. extern dictates the storage, meaning this is merely one declaration, this variable is defined somewhere else.

Is Auto a local variable?

In computer programming, an automatic variable is a local variable which is allocated and deallocated automatically when program flow enters and leaves the variable's scope. The scope is the lexical context, particularly the function or block in which a variable is defined.

Can main method be final?

Can we declare the main () method as final in Java? Yes, we can declare the main () method as final in Java. The compiler does not throw any error. If we declare any method as final by placing the final keyword then that method becomes the final method.

Can we overload main method?

Yes, we can overload the main method in Java, but When we execute the class JVM starts execution with public static void main(String[] args) method.

Can we declare main () method as non static?

You can write the main method in your program without the static modifier, the program gets compiled without compilation errors. But, at the time of execution JVM does not consider this new method (without static) as the entry point of the program.

Can we use final with constructor?

No, a constructor can't be made final. A final method cannot be overridden by any subclasses. As mentioned previously, the final modifier prevents a method from being modified in a subclass.

Can static variables be modified in Java?

A static variable is common for all instances of the class. A final variable can not change after it has been set the first time. So a static final variable in Java is common for all instances of the class, and it can not be changed after it has been set the first time.

Can we declare static variable in abstract class?

Yes, of course you can define the static method in abstract class. you can call that static method by using abstract class,or by using child class who extends the abstract class.

Can we declare interface as final?

If you make an interface final, you cannot implement its methods which defies the very purpose of the interfaces. Therefore, you cannot make an interface final in Java.

Can we create immutable class in Java?

In Java, when we create an object of an immutable class, we cannot change its value. For example, String is an immutable class. Hence, we cannot change the content of a string once created. Besides, we can also create our own custom immutable classes.

Can we create object of abstract class?

We cannot create objects of an abstract class. To implement features of an abstract class, we inherit subclasses from it and create objects of the subclass. A subclass must override all abstract methods of an abstract class. However, if the subclass is declared abstract, it's not mandatory to override abstract methods.