Solved

need simple explanition for a simple code

Posted on 2002-04-28
9
174 Views
Last Modified: 2010-03-31
i have this function to produce different colors ,
why i need the word final here , what is its function ?
does the function work with out it ?

public static final String[] COLORS={
       "#EEE8AA","#FFEFD5","#FFDAB9","#FFFFFF"
  };
0
Comment
Question by:star4
9 Comments
 
LVL 7

Accepted Solution

by:
yoren earned 50 total points
ID: 6975303
star4,

What you've listed is not a function but an array. You can access the array like this: COLORS[2]

The "final" keyword for variables means that the value will never change. It lets Java optimize the code better. Your statement will work without "final", but then it will be a normal array which you can modify in your code. If you're familiar with C, 'final' is similar to 'const'.

Yuval
0
 
LVL 1

Expert Comment

by:XAN
ID: 6987548
you need "final" if you define this variable in internal class
0
 
LVL 7

Expert Comment

by:yoren
ID: 6987565
XAN, do you mean an inner class? Inner classes cannot have static variables at all. There is no requirement for "final" though.
0
Free Tool: IP Lookup

Get more info about an IP address or domain name, such as organization, abuse contacts and geolocation.

One of a set of tools we are providing to everyone as a way of saying thank you for being a part of the community.

 
LVL 1

Expert Comment

by:XAN
ID: 7007224
Hi, youren.
What about this:

public class Task {
  class subtask {
    static final String st_fin = "THIS IS STATIC!";
    static String st_non_fin = "THIS IS STATIC NOT FINAL";
    public subtask(){}
  }
  public Task() {}
}


Please compile this code and tell me about your experience with it ;)
0
 
LVL 1

Expert Comment

by:XAN
ID: 7007225
But, youren, you are absolutely right this is NOT FUNCTION :)
0
 
LVL 7

Expert Comment

by:yoren
ID: 7007243
Your code demonstrates that you cannot have non-final static variables in inner classes. Technically, inner classes can have static variables if declared final, but I don't really consider those variables. They're really just constants.

0
 
LVL 1

Expert Comment

by:XAN
ID: 7007250
CONSTATNS in java is just STATIC FINAL VARIABLES (by definition)

So, let return to our question. The code

public static final String[] COLORS={
      "#EEE8AA","#FFEFD5","#FFDAB9","#FFFFFF"
 };

couldn't work without word 'final' if it is definition belongs to inner class.

Tell me, please, you are agree, and that
  "Inner classes can have static variables at all" :)

Cheers ;)
me
0
 
LVL 5

Expert Comment

by:vemul
ID: 7898811
No comment has been added lately, so it's time to clean up this TA.
I will leave a recommendation in the Cleanup topic area that this question is:

- points to yoren

Please leave any comments here within the
next seven days.

PLEASE DO NOT ACCEPT THIS COMMENT AS AN ANSWER !

vemul
Cleanup Volunteer
0
 
LVL 1

Expert Comment

by:Computer101
ID: 7959836
Comment from expert accepted as answer

Computer101
E-E Admin
0

Featured Post

Active Directory Webinar

We all know we need to protect and secure our privileges, but where to start? Join Experts Exchange and ManageEngine on Tuesday, April 11, 2017 10:00 AM PDT to learn how to track and secure privileged users in Active Directory.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Suggested Solutions

Title # Comments Views Activity
session migration servlets 2 42
hibernate example for saving data 19 54
Crystal Reports Licensing Questions 4 35
Java basic valueOf question 1 29
Introduction This article is the first of three articles that explain why and how the Experts Exchange QA Team does test automation for our web site. This article explains our test automation goals. Then rationale is given for the tools we use to a…
In this post we will learn how to connect and configure Android Device (Smartphone etc.) with Android Studio. After that we will run a simple Hello World Program.
Viewers learn about the scanner class in this video and are introduced to receiving user input for their programs. Additionally, objects, conditional statements, and loops are used to help reinforce the concepts. Introduce Scanner class: Importing…
Viewers will learn about arithmetic and Boolean expressions in Java and the logical operators used to create Boolean expressions. We will cover the symbols used for arithmetic expressions and define each logical operator and how to use them in Boole…

829 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question