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Questions tagged [final]

final is a common keyword specifying that the reference declared as final cannot be modified once it is initialized. In Java the keyword final is roughly equivalent to const in C++. In C++ the final keyword allows you to declare a virtual method, override it N times and then mandate that 'this can no longer be overridden'.

Refer to how the final keyword is used in different programing languages

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Am I using the synchronized block correctly?

I have a SwingWorker which makes calls to the twitter API and gets some results back, everytime a result is received I first update the member variable _latestValidResult, then I take a list of tweets from the result and add it to my list and then I…
Aki K
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How to save Date object in const variable in java

I created one class : public class CreateAccount { public static Date dNow = new Date(); public static SimpleDateFormat WebsiteURL = new SimpleDateFormat ("E'-'yyyy'-'MM'-'dd'-'hh'-'mm'-'ss'-'a"); public static final String DummyTime =…
Al.s
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Android View.post() method making excessive reference

Sorry I can't come up with a better question title because it's pretty hard to describe... I was inspecting Android's source (4.4 KK), the View class in particular and this showed up: // .... lots of stuff.... AttachInfo mAttachInfo; // .... lots of…
tom91136
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Image visibility set through handler and function

I need to do setVisibility for an imageview named "heart" through handler and and function get(A). I declared imageview heart as a final variable in the onCreation method and under the class named Another Activity. But whenever I tried to set…
Sungpah Lee
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Final non-static data member

If you are not allowed to initialize a final non-static data member twice, then how can I set x to something that I want in the following example? class Temp6 { final int x; Temp6() { System.out.println(this.x); …
RAJAN_PARMAR
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Can you write final functions in C#?

I wondered if you can write final (Java) functions/methods in C#. Can I see some examples of C# final functions/methods? There is the opposite question here.
Bastien Vandamme
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inner class have access to private final methods in base class but why?

Why creators of java allowed this situation? I am sure there must be some reason for it. My below code allows Lion to mischievously run as fast as Cheetah. public class animal { class carnivores { private final void runAsFastAsCheetah()…
instinct
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Trying to add ActionListener to a buttonArray

I am not exactly sure what is wrong with my code but, in the process of adding the ActionListeners, I get the error : "local variables referenced from an inner class must be final or effectively final." Appreciate the help :). for (int i = 0; i <…
xwillflame
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Final field, reference and safe publication

Consider the following non-traditional implementation of double-check locking that does not use volatile: public class ValueProvider { private static State state = new Initial(); public static Value getValue() { return state.getValue(); …
AngryJuice
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Why must I use final in this situation?

The situation is like below: import java.io.File; public class FinalTest1 { public static void main(String[] args) { FinalTest1 finalTest1 = new FinalTest1(); finalTest1.test(); } public void test(){ File…
Eugene
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Automatically initializing an int messageID in a constructor

How can I initialize a final int in the constructor in Java to be with 1 bigger than the previous instance and can I do that at all? I mean i have a final int messageID; which must be unique for every instance, how can I do that?
I.Anchev
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Java compiler/eclipse not reconizing dead code

So I recently came accros this. I was creating an if-else-statement with as it's condition a final boolean variable. Eclipse immediatly told me that the else part of the code was unreachable and therefore dead code. This was my…
Roan
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Change value of a local variable that needs to be declared final

I have been trying to change the position of my JButton in the action listener. However, when I compiled my code Local variable is accessed from within inner class: needs to be declared final error was displayed. Therefore, I declared my location…
user3728492
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AWT ActionListener as abstract class

I have a program with a AWT GUI in Java. My problem is that I have a lots of abstract Classes (ActionListener) in this program. Within this abstract classes I need to call attributes from the main-class. So, at the moment I must all needed…
user3302074
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Can setPriority() method be used by a subclass extending Thread class

General Form of setPriority() method is final void setPriority(int level) My question is whether setPriority() method can be used by a subclass extending Thread class since it cannot be overridden because final modifier is set to the…
sweet_revathy569
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