Go Premium for a chance to win a PS4. Enter to Win

x
?
Solved

Jprogress bar

Posted on 2004-03-27
9
Medium Priority
?
379 Views
Last Modified: 2008-02-01
I have a Jprogress bar...I am trying to learn how to use it... this is the method i created to play around with it:

public void test() {
        importProgress.setMaximum(200000);
        for(int x=0;x<200000;x++){
            System.out.println(x);
            importProgress.setValue(x);
            importProgress.setStringPainted(true);
           
        }
    }

When I call the method, the loop does its proccessing, but the progress bar does not update until the loop is done. I want it to update in real time.. I assume i  need a listener for it. if this true what would the listener look like
thanks in advance
0
Comment
Question by:91mustang
  • 5
  • 4
9 Comments
 
LVL 30

Expert Comment

by:GrandSchtroumpf
ID: 10697810
you need a separate thread:

  public void test() {
   
    Thread progressThread = new Thread() {
      public void run() {
        importProgress.setMaximum(200000);
        for(int x=0;x<200000;x++){
          System.out.println(x);
          importProgress.setValue(x);
          importProgress.setStringPainted(true);
        }
      }
    };
    progressThread.start();
   
  }
0
 
LVL 30

Expert Comment

by:GrandSchtroumpf
ID: 10697830
setStringPainted(true) can be called outside the loop.
and you can use the sleep() inside your loop:

  public void test() {
    Thread progressThread = new Thread() {
      public void run() {
        importProgress.setMaximum(100);
        importProgress.setStringPainted(true);
        for(int x=0;x<=100;x++){
          System.out.println(x);
          importProgress.setValue(x);
          importProgress.repaint();
          try { sleep(100); }
          catch (Exception e) { ; }
        }
      }
    };
    progressThread.start();
  }
0
 
LVL 4

Author Comment

by:91mustang
ID: 10698691
Perfect  GrandSchtroumpf, thank you

quick question, this method is going to used i a app that is importing text file to database, usually between 4-5 mill recs per text file(not alot of proccessing per line, but lots of lines.) how much resources will that new thread chew?, and i'm geussing that sleep(100) is pausing the thread for 100 milliseconds. If so what do you think would a reasonabnle sleep time for that thread

thank you again
0
Technology Partners: We Want Your Opinion!

We value your feedback.

Take our survey and automatically be enter to win anyone of the following:
Yeti Cooler, Amazon eGift Card, and Movie eGift Card!

 
LVL 30

Expert Comment

by:GrandSchtroumpf
ID: 10698797
i included the thread.sleep() just for the example.
you need to replace that with your import.

      public void run() {
        int numberOfRecords = 1000; // replace that with the actual number
        importProgress.setMaximum(numberOfRecords-1);
        importProgress.setStringPainted(true);
        for(int x=0;x<numberOfRecords;x++){
          importRecord(x);
          importProgress.setValue(x);
        }
      }
0
 
LVL 4

Author Comment

by:91mustang
ID: 10699496
GrandSchtroumpf
Sorry for my ignorance.

when i use:

 public void test() {
        Thread progressThread = new Thread() {
            public void run() {
                importProgress.setMaximum(intLineCount-1);
                importProgress.setStringPainted(true);
                for(int x=0;x<=intLineCount;x++){
                   
                    importProgress.setValue(currentLineCount);
                    importProgress.repaint();
                   
                   
                }
            }
        };
        progressThread.start();
    }

the progress bar does nothing until the proccessing is done- and then shows 0% done.

currentLineCount is getting increased in a file read loop(every line)

what am i doing wrong?
0
 
LVL 4

Author Comment

by:91mustang
ID: 10699585
>>the progress bar does nothing until the proccessing is >>done- and then shows 0% done.

sorry, actually it says 100% but does not show any values in between 0 and 100
0
 
LVL 30

Accepted Solution

by:
GrandSchtroumpf earned 100 total points
ID: 10699751
> does not show any values in between 0 and 100.
that's because the thread that updates the value of the progress bar does not leave enough time to the  swing thread to display the progress.
this is why i added the sleep.  the sleep leaves time to the swing thread to display the progress.
if you do something in the thread that has some kind of delay involved, such as reading the file and processing your database insert, you will see the progress.
look at the comment i posted in the other thread:
http://www.experts-exchange.com/Programming/Programming_Languages/Java/Q_20935198.html
0
 
LVL 4

Author Comment

by:91mustang
ID: 10699837
thanks again
0
 
LVL 30

Expert Comment

by:GrandSchtroumpf
ID: 10699944
you're welcome mustang
:°)
0

Featured Post

Free Tool: Site Down Detector

Helpful to verify reports of your own downtime, or to double check a downed website you are trying to access.

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

For beginner Java programmers or at least those new to the Eclipse IDE, the following tutorial will show some (four) ways in which you can import your Java projects to your Eclipse workbench. Introduction While learning Java can be done with…
In this post we will learn how to make Android Gesture Tutorial and give different functionality whenever a user Touch or Scroll android screen.
The viewer will learn how to implement Singleton Design Pattern in Java.
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

885 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