Final static variable in Java. Declaring variables only as static can lead to change in their values by one or more instances of a class in which it is declared. Declaring them as static final will help you to create a CONSTANT. Only one copy of variable exists which can't be reinitialize..
Also, can static and final come together?
Static keyword is applicable to nested static class, variables, methods and block. Final keyword is applicable to class, methods and variables. Static methods can only access the static members of the class, and can only be called by other static methods. Final methods can not be inherited.
should final variables be static? No, absolutely not - and it's not a convention. static and final are entirely different things. static means that the field relates to the type rather than any particular instance of the type. final means that the field can't change value after initial assignment (which must occur during type/instance initialization).
Also question is, what is difference between final and static?
The difference between static and final in java is that static is a keyword in java that is used to define the class member that can be used independently of any object of class whereas final keyword in java is used to declare a constant variable that cannot be overridden and a class that cannot be inherited.
Why have a private static final?
Making anything "private" means it is only available from within the class it was defined, "static" makes that variable available from ANYWHERE in that class, and "final" does not allow that variable to be changed, adding the modifier "final" changes your "variable" to a "constant" due to it's constant value instead of
Related Question Answers
What is final static?
Final static variable in Java. Declaring variables only as static can lead to change in their values by one or more instances of a class in which it is declared. Declaring them as static final will help you to create a CONSTANT. Only one copy of variable exists which can't be reinitialize.Why main method is static?
Java program's main method has to be declared static because keyword static allows main to be called without creating an object of the class in which the main method is defined. In this case, main must be declared as public , since it must be called by code outside of its class when the program is started.Can a constructor be final?
No Constructors can NEVER be declared as final. Your compiler will always give an error of the type "modifier final not allowed" Final, when applied to methods, means that the method cannot be overridden in a subclass. Constructors are NOT ordinary methods. So there is NO SENSE in declaring it final.Can static class be inherited?
Static classes are sealed and therefore cannot be inherited. They cannot inherit from any class except Object. Static classes cannot contain an instance constructor; however, they can contain a static constructor. For more information, see Static Constructors.Can static method be inherited?
Static methods are inherited in Java but they don't take part in polymorphism. If we attempt to override the static methods they will just hide the superclass static methods instead of overriding them. Static method is inherited in subclass but it is not polymorphism.When would you use a static method?
Use static when you want to provide class level access to a method, i.e. where the method should be callable without an instance of the class. Static methods don't need to be invoked on the object and that is when you use it. Example: your Main() is a static and you don't create an object to call it.Can a static method be overridden in Java?
Answer is, No, you can not override static method in Java, though you can declare method with same signature in sub class. As per Java coding convention, static methods should be accessed by class name rather than object. In short Static method can be overloaded, but can not be overridden in Java.How do you declare a static variable?
To create a static member(block,variable,method,nested class), precede its declaration with the keyword static. When a member is declared static, it can be accessed before any objects of its class are created, and without reference to any object.Is static variable can be changed?
Yes.. it can be changed. But, what makes static variable unique is static variables belongs to the class instead of a particular object. If one objects changes the value of the static variable, it will reflect in other objects too. We can also access the static variables without creating object for that class.What is the use of static keyword?
The static keyword is used in java mainly for memory management. It is used with variables, methods, blocks and nested class. It is a keyword that are used for share the same variable or method of a given class. This is used for a constant variable or a method that is the same for every instance of a class.What is singleton class in Java?
Singleton Class in Java. In object-oriented programming, a singleton class is a class that can have only one object (an instance of the class) at a time. To design a singleton class: Make constructor as private. Write a static method that has return type object of this singleton class.What is the use of static final in Java?
It basically means if you change it for one object it will be changed for all just like a global variable(limited by scope). Hope it helps. final indicates that the value cannot be changed once set. static allows you to set the value, and that value will be the same for ALL instances of the class which utilize it.What is private static final in Java?
up vote 1. private static final will be considered as constant and the constant can be accessed within this class only. Since, the keyword static included, the value will be constant for all the objects of the class. private final variable value will be like constant per object. You can refer the java.Can static methods override?
Static methods cannot be overridden because they are not dispatched on the object instance at runtime. The compiler decides which method gets called. Static methods can be overloaded (meaning that you can have the same method name for several methods as long as they have different parameter types).What is Polymorphism in Java?
Polymorphism in Java is a concept by which we can perform a single action in different ways. We can perform polymorphism in java by method overloading and method overriding. If you overload a static method in Java, it is the example of compile time polymorphism. Here, we will focus on runtime polymorphism in java.What is the difference between public static and private static?
Well you are right public static variables are used without making an instance of the class but private static variables are not. The main difference between them and where I use the private static variables is when you need to use a variable in a static function. That is the only case I use private static for.Can final method be overloaded?
Yes!!! We can overload a final method, and its possible in JAVA. But we cannot override final methods. A method declared as final, can be overloaded.Can a Final Variable be null?
In present-day Java, a final variable is a variable declared with the final keyword. The uninitialized default value (null or zero) can sometimes be observed by code which has access to the containing object (or class, if the variable is static). But normally, a final variable is initialized shortly it is created.What is final int in Java?
final variables in Java. In Java, when final keyword is used with a variable of primitive data types (int, float, .. etc), value of the variable cannot be changed. For example following program gives error because i is final. 
