the problem of reuse based on the functions

I read the text in quotes as follows a book written by a Microsoft Developer. I googled and found a good number of citations of it, but did not find any explanation.

============
With languages like C, the basic unit of re-use is the function. The problem with reuse based on a function, is that the function is coupled to the data, he manipulates. and if the data world, a change to a function in the context of re-use infringes another function used somewhere else.
============

C using the libraries widely, which is to reuse based on functions. Kindly can anyone give me a scenario where this problem occurs?

Java is usually based on objects for reuse, and I confess that my question is not a Java. But I think that would help to better understand the concept or the benefits of the Java language design. So, thank you for allowing me to ask this question here,

Published by: 799160 on September 30, 2010 12:38

Published by: 799160 on September 30, 2010 12:57

That's what I came to read the quote you posted:

I guess something like the following might happen:

You (being a person in General) have received a class change. You examine the code for the first time, and it has a bunch of methods and variables of class in it. Some methods use class variables. How can you be sure that if you change the functionality for editing a class variable in one method will not affect the other methods when they are used? This problem can be solved by learning everything that is and how it interacts, the correct way to use it. But then again, if you don't think about it and to make changes... Oops!

-----

Maybe another abstract example would be wise:
Imagine a calculator that could be used by 2 people at the same time? I bet it would come with a few funny answers :)

-----

I hope that I wrote a short example of this, he makes some sense:

public class SuperBigProgram
{
     private int globalVar;

     public static void main ( String[] args )
     {
          new SuperBigProgram();
     }

     public SuperBigProgram()
     {
          System.out.println("I'm a super big program.");

          globalVar = 0;

          //Let's pretend these series of events occur during the program:

          doItHighChanceActivity(); //1
          doItHighChanceActivity(); //2
          doItHighChanceActivity(); //3

          //Whoops super rare event occured!
          doesNotHappenALot();

          doItHighChanceActivity(); //4????    but is really 5.
     }

     /**
      * This happens A LOT!
      */
     private void doItHighChanceActivity ()
     {
          superUtilityMethod();

          System.out.println("globalVar: " + globalVar);
     }

     /**
      * This utility method does some awesome utility stuff for our Super Big Program.
      * This changes some global data.
      */
     private void superUtilityMethod()
     {
          globalVar++;
     }

     /**
      * This does not happen a lot, if at all.
      */
     private void doesNotHappenALot()
     {
          //Hey I don't happen a lot but I'm reusing this really cool utility method that contains global data...
          //Code reuse for the win!
          superUtilityMethod();
     }

}

Here is the result:

I'm a great big program.
globalVar: 1
globalVar: 2
globalVar: 3
globalVar: 5

Published by: kilosi on Sep 30, 2010 13:22

Tags: Java

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~~~~~~~~~~~~~~~~~~~~

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Kind regards

SAMO

From the Manual 11.2 ( https://docs.oracle.com/cd/E11882_01/appdev.112/e41502/adfns_indexes.htm#ADFNS254 )

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Can enable you logging ADF for package oracle.jheadstart.controller.jsf.bean, which should show instructions for debugging of bean FunctionKeyHandlerImpl Manager.

Better yet, run your application in mode bug, set a breakpoint in FunctionKeyHandlerImpl.handleKeyCode and press Caps - F5. That should clarify what happens.

Steven Davelaar,
Jheadstart team.

the function on forms 4.5 problems
Hi all... can anyone help me to solve my problem... im so depressed with this... :(

I create a function object to our test server with this script: where sc_hijri_end_date
is VARCHAR2 (30) in the TEST table.
--------------------------------
create or replace
FUNCTION f_conv (p_hijri_date IN VARCHAR2)
DATE OF RETURN
IS
BEGIN
RETURN TO_DATE (p_hijri_date, ' dd/mm/yyyy','nls_calendar = "English Hijrah" ');
END f_conv;
--------------------------------

I call this function in a function SET_BLOCK_PROPERTY, where v_where_clause is VARCHAR2 (512).
--------------------------------
v_where_clause: = ' f_conv (sc_hijri_end_date) < = "' | to_char(:Control.txt_date) | '''';
SET_BLOCK_PROPERTY (block_id, DEFAULT_WHERE, v_where_clause);
GO_BLOCK ('test');
EXECUTE_QUERY;
--------------------------------
NOTE: I have no problem with that... I can retrieve record. But when I try to create a program of units (function) in the form.
There is no save retrieve. :(

This is the function I created in form. :
--------------------------------
FUNCTION f_con (p_hijri_date IN VARCHAR2) DATE of RETURN IS
date of T_DATE;
BEGIN
BEGIN
SELECT TO_DATE (p_hijri_date, ' DD/MM/YYYY','nls_calendar = "English Hijrah" ')
IN T_DATE
FROM DUAL;
END;
MESSAGE (to_char (V_DATE));
take a break;
RETURN T_DATE;
END;
--------------------------------

Yet once... by using this function, I call this function in a function SET_BLOCK_PROPERTY, where v_where_clause is VARCHAR2 (512).
--------------------------------
v_where_clause: = ' f_con (sc_hijri_end_date) < = "' | to_char(:Control.txt_date) | '''';
SET_BLOCK_PROPERTY (block_id, DEFAULT_WHERE, v_where_clause);
GO_BLOCK ('test');
EXECUTE_QUERY;

He has not recovered records. :(
Everything that you put in the where clause of a block is added to the sql issued forms to run the query. The sql code is sent to the database and there, running on the server. So, it's impossible to use a local sql function, as the database doesn't "know" this function.

the problem of reuse based on the functions

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