Solved

Variables

Posted on 2006-10-24
6
182 Views
Last Modified: 2010-03-31
I have a method abc() in class XYZ { long a=0,b,c,d;

abc()
{

 if(condition A)
 { a=System.currentTimeMillis(); }

if(condition B)
{
 b=c-a;  //i am getting a= 0 when i call the method abc() second time...
}


First time when i call method condition A satisfies

when i call second time Condition B gets satisfied

How can i keep value a= what ever i got at the condition A


Thanks
0
Comment
Question by:cutie_smily
[X]
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
  • 2
6 Comments
 

Author Comment

by:cutie_smily
ID: 17796917

when i call abc method second time value of variable a becomes zero. I want to keep the value of a when this if satisfied

if(condition A)
 { a=System.currentTimeMillis(); }
0
 
LVL 24

Expert Comment

by:sciuriware
ID: 17798359
What does abc() return?  void?

you might rewrite a as:

   private static boolean firstTime = true;

  public void abc()
  {
       if(conditionA)
       {
             if(firstTime)
             {
                    firstTime = false;
                    a=System.currentTimeMillis();
             }
       }
...................

// now 'a' is only once assigned a value (for this object ONLY!).

;JOOP!
             
0
 
LVL 24

Accepted Solution

by:
sciuriware earned 125 total points
ID: 17798381
Correction: my solution is for ALL objects XYZ.
If you want this to happen PER OBJECT, then drop the word 'static'.

;JOOP!        
0
 

Assisted Solution

by:AdolfDaniel
AdolfDaniel earned 125 total points
ID: 17799409
If you assign the attribute a a value it will not be reset to 0 except you do it.
See the following example:


public class Xyz {
      private long a, b, c;

      public void abc(boolean condition1, boolean condition2) {
            if (condition1) {
                  a = System.currentTimeMillis();
            }
            if (condition2) {
                  b = c-a;
            }
      }
      
      public long getA() {
            return a;
      }
      
      public static void main(String[] args) {
            Xyz xyz = new Xyz();
            xyz.abc(true, false);
            System.out.println("a: " + xyz.getA());
            xyz.abc(false, true);
            System.out.println("a: " + xyz.getA());
            xyz.abc(true, true);
            System.out.println("a: " + xyz.getA());
      }

}
0

Featured Post

Revamp Your Training Process

Drastically shorten your training time with WalkMe's advanced online training solution that Guides your trainees to action.

Question has a verified solution.

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

An old method to applying the Singleton pattern in your Java code is to check if a static instance, defined in the same class that needs to be instantiated once and only once, is null and then create a new instance; otherwise, the pre-existing insta…
Introduction This article is the last of three articles that explain why and how the Experts Exchange QA Team does test automation for our web site. This article covers our test design approach and then goes through a simple test case example, how …
Viewers will learn one way to get user input in Java. Introduce the Scanner object: Declare the variable that stores the user input: An example prompting the user for input: Methods you need to invoke in order to properly get  user input:
This tutorial covers a step-by-step guide to install VisualVM launcher in eclipse.
Suggested Courses

631 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