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May 20, 2018 · Final: final should be used over const if you don't know the value at compile time, and it will be calculated/grabbed at runtime. If you want an HTTP response that can't be changed, if you want to get something from a database, or if you want to read from a local file, use final. Anything that isn't known at compile time should be final over const.
Jan 12, 2012 · As other posters pointed out, it cannot be applied to non-virtual functions. One purpose of the final keyword is to prevent accidental overriding of a method. In my example, DoStuff () may have been a helper function that the derived class simply needs to rename to get correct behavior.
4. final is a reserved keyword in Java to restrict the user and it can be applied to member variables, methods, class and local variables. Final variables are often declared with the static keyword in Java and are treated as constants. For example: public static final String hello = "Hello";
Feb 1, 2009 · Personally I don't use final on method parameters, because it adds too much clutter to parameter lists. I prefer to enforce that method parameters are not changed through something like Checkstyle. For local variables I use final whenever possible, I even let Eclipse do that automatically in my setup for personal projects.
Dec 7, 2012 · 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 -.
5. If the class is marked final, it means that the class' structure can't be modified by anything external. Where this is the most visible is when you're doing traditional polymorphic inheritance, basically class B extends A just won't work. It's basically a way to protect some parts of your code (to extent).
Long answer: When talking about final local variables keep in mind that using the keyword final will help the compiler optimize the code statically, which may in the end result in faster code. For example, the final Strings a + b in the example below are concatenated statically (at compile time).
Sep 13, 2009 · First one saves memory, go for it. final static means this variable is a constant and only associates with the class itself, i.e. "one constant variable per class" while final means "one constant variable per instance". As a result, you cannot put a final static variable in the class' constructor since the constructor involves in new an instance.
Jan 5, 2014 · 2. final is a variable declare with key word final , example: final double pi = 3.14 ; it remains final through out the program, changing pi after this line is never allowed. effectively final : any local variable or parameter that is assigned a value only once right now (or updated only once).
Use final keyword for a variable if you are making that variable as immutable. By declaring the variable as final, it aids developers to rule out possible modification issues of variables in highly multi-threaded environment. With java 8 release, we have one more concept called " effectively final variable ".
