?
Solved

load a frame once

Posted on 2003-12-02
5
Medium Priority
?
194 Views
Last Modified: 2010-07-27
Im using the code below to load a frame every time a user opens the class file concerned with the following code. But I want the frame only to be loaded once, just when the user loads the class for the first time, and the for the class to be dynamically updated. The if statement im tyring to use throws an error when a second user trys to concurrently load the class file. Any help would be great, thanks.

public F(int NO){
            super("F");
            if(NO == 0){//this flag causes an error
            dis = new TextArea(20 , 10);
                  add("Center" , display);
          resize(300 , 150);
          show();
            }      
0
Comment
Question by:Ronayne
  • 3
5 Comments
 
LVL 92

Expert Comment

by:objects
ID: 9863631
you need to change the code that actually create F.
Keep an instance to F, and reuse it.
0
 

Author Comment

by:Ronayne
ID: 9863644
Im creating different instances of f for different parameters passed in variable NO
0
 
LVL 92

Accepted Solution

by:
objects earned 200 total points
ID: 9863663
would a Hashtable on frames help you:

private Hashtable frames = new Hashtable();


public F getFrame(int no)
{
   Integer _no = new Ineteger(no);
   F result = (F) frames.get(_no);
   if (result==null)
   {
      result = new F(no);
      frames.put(_no, result);
   }
   return result;
}
0
 
LVL 3

Expert Comment

by:InNoCenT_Ch1ld
ID: 9863961
does the question mean the instance of the frame can be open one at a time?

i try this using JInternalFrame.

set
-doDefaultCloseOperation(WindowConstants.HIDE_ON_CLOSE); for the frame
-when you want to frame to be open, use setVisible(true);

i successfully restrict the frame to be loaded one at a time.

Feel free to discard this comment if this is not what you asking ;)

-Child that so pissed off!-
0
 
LVL 92

Expert Comment

by:objects
ID: 9959144
0

Featured Post

Free Tool: Port Scanner

Check which ports are open to the outside world. Helps make sure that your firewall rules are working as intended.

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.

Question has a verified solution.

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

Java functions are among the best things for programmers to work with as Java sites can be very easy to read and prepare. Java especially simplifies many processes in the coding industry as it helps integrate many forms of technology and different d…
In this post we will learn different types of Android Layout and some basics of an Android App.
This tutorial covers a practical example of lazy loading technique and early loading technique in a Singleton Design Pattern.
This tutorial explains how to use the VisualVM tool for the Java platform application. This video goes into detail on the Threads, Sampler, and Profiler tabs.
Suggested Courses
Course of the Month14 days, 11 hours left to enroll

840 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