static vs final in Java

Question

explain the basic difference between static and final with examples.

Answer 1

final: Once a final variable has been assigned, it always contains the same value - it can not be changed

static: a static variable can change as often as you re-asign a value - and you do not need to object of a class to access it, you can access it using the class-name

An example is the value PI of the class Math, you can simple access it with
Math.PI
withouth the need of creating a Object of the Math Class

A combination of both is possible, let's take PI of the Java Math class again as example.
If you look up the source code of java.lang.Math you will see:

public static final double PI = 3.14159265358979323846;

which means:
- PI can be accessed without the need of having an object of the Math class since it is static
- PI can not be changed because it is final

Answer 2

Some stuff that was not said:

static actually makes the member bounce to the class itself. As a result, you cannot override them (But can 'hide' them). Since it becomes bound to the class you can also access it how @Martin put it. (Although, you don't need to do that unless you're in a different class).
* Keep in mind, inside a static method you cannot access a non-static method without an instance of the class.*

final for variables is exactly as @Martin put it.
Final methods on the other hand, cannot be overrided, and cannot be hidden.

Final classes cannot be sub-classed. This is because all members become final, so the purpose of a sub-class becomes meaningless.

Answer 3

OK gd answer.

Answer 4

Got a clarity on overriding (static and final). thank-you for ur time