Difference between Static and final?

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I'm always confused between static and final keywords in java.

How are they different ?

Difference between Static and final?, The static keyword can be used in 4 scenarios. static variables; static methods; static blocks of code; static nested class. Let's look at 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.

static means it belongs to the class not an instance, this means that there is only one copy of that variable/method shared between all instances of a particular Class.

public class MyClass {
    public static int myVariable = 0; 
}

//Now in some other code creating two instances of MyClass
//and altering the variable will affect all instances

MyClass instance1 = new MyClass();
MyClass instance2 = new MyClass();

MyClass.myVariable = 5;  //This change is reflected in both instances

final is entirely unrelated, it is a way of defining a once only initialization. You can either initialize when defining the variable or within the constructor, nowhere else.

note A note on final methods and final classes, this is a way of explicitly stating that the method or class can not be overridden / extended respectively.

Extra Reading So on the topic of static, we were talking about the other uses it may have, it is sometimes used in static blocks. When using static variables it is sometimes necessary to set these variables up before using the class, but unfortunately you do not get a constructor. This is where the static keyword comes in.

public class MyClass {

    public static List<String> cars = new ArrayList<String>();

    static {
        cars.add("Ferrari");
        cars.add("Scoda");
    }

}

public class TestClass {

    public static void main(String args[]) {
        System.out.println(MyClass.cars.get(0));  //This will print Ferrari
    }
}

You must not get this confused with instance initializer blocks which are called before the constructor per instance.

Final static variable in Java, Difference between static and non-static variables in Java · Blank Final in Java · Using final with Inheritance in Java · final variables in Java · final vs Immutability in  Difference Between Final and Static Variable. Static stands for a variable that is common to all objects that instantiate a given class while final defines Method. Static is a method that is the same for each object given class – is also called class member e.g. such is the Class. The final

The two really aren't similar. static fields are fields that do not belong to any particular instance of a class.

class C {
    public static int n = 42;
}

Here, the static field n isn't associated with any particular instance of C but with the entire class in general (which is why C.n can be used to access it). Can you still use an instance of C to access n? Yes - but it isn't considered particularly good practice.

final on the other hand indicates that a particular variable cannot change after it is initialized.

class C {
    public final int n = 42;
}

Here, n cannot be re-assigned because it is final. One other difference is that any variable can be declared final, while not every variable can be declared static.

Also, classes can be declared final which indicates that they cannot be extended:

final class C {}

class B extends C {}  // error!

Similarly, methods can be declared final to indicate that they cannot be overriden by an extending class:

class C {
    public final void foo() {}
}

class B extends C {
    public void foo() {}  // error!
}

Difference Between Static and Final in Java – Difference Wiki, 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  static vs final java, both are known access modifiers in Java doing different functionalities (used for different jobs). static: static keyword can be applied to instance variables and methods but not to classes. When applied, variables and methods can be called without the help of an object.

final -

1)When we apply "final" keyword to a variable,the value of that variable remains constant. (or) Once we declare a variable as final.the value of that variable cannot be changed.

2)It is useful when a variable value does not change during the life time of a program

static -

1)when we apply "static" keyword to a variable ,it means it belongs to class. 2)When we apply "static" keyword to a method,it means the method can be accessed without creating any instance of the class

What is the difference between static and final keyword ?, Final Keyword: * Final Keyword is used to restrict the user. It means: * If you declare variable as static then you cannot change its value. 1. Static is something that any object in a class can call, that inherently belongs to an object type. A variable can be final for an entire class, and that simply means it cannot be changed anymore. It can only be set once, and trying to set it again will result in an error being thrown.

static means there is only one copy of the variable in memory shared by all instances of the class.

The final keyword just means the value can't be changed. Without final, any object can change the value of the variable.

What is the Difference Between static and final, The main difference between static and final is that the static is used to define the class member that can be used independently of any object of  static simple means class level object that means if you are making any method or variable static that means its objects get created at the time of class object creation . and final is different thing i don't have any point to compare static and if you are making any variable final so you cant change its value further and you can also make a class final .

Difference Between Static and Final in Java, Static methods can be overriden, but they cannot be overriden to be non-static,​Whereas final methods cannot be overridden. A static method is a method that's  The main difference between static and final is that the static is used to define the class member that can be used independently of any object of the class. In contrast, final is used to declare a constant variable or a method that cannot be overridden or a class that cannot be inherited.

What is the difference between final and static in Java?, final keyword As the name suggests its value is final and it cannot be modified once assigned. 1. Declaring the variable as final - does not allow to modify the 

Difference Between static and final in Java, The key difference between static and final in Java is that static is used to define the class member that can be used independently of any object 

Comments
  • (I did not downvote you) Some further clarifications: "A static method can access only static data. It can not access non-static data (instance variables)" - UNLESS it has/creates an instance of the class. "A static method can call only other static methods and can not call a non-static method from it." - UNLESS it has/creates an instance of the class.
  • in static method Syntax explanation you mentioned wrongly i think. it could be Class.methodName()
  • we can have static class too. Make correction in your answer. Thanks :)
  • As of Java 8 an anonymous class (and lambda) can access effectively final variables and no restriction of final keyword.
  • Following input provided by you is able to clear all confusion thanks...final is entirely unrelated, it is a way of defining a once only initialization. You can either initialize when defining the variable or within the constructor, nowhere else.
  • Simple and clear as things should be. Accepted answer is just.... verbose.
  • Thanks for the inputs. The code gives error: class C { public static int n = 42; } it says the field cannot declare static in non-static type. Why can't I declare or do C.n?
  • @TechnoCorner only top level classes (the potentially public class that defines the file) or static inner classes can define static variables. Other inner classes are instances of the outer class and can't have static variables.
  • What do you mean for a particular object? Can you please illustrate.