?
Solved

Progress bar with a TextField (JDK 1.0.2)

Posted on 1998-12-14
1
Medium Priority
?
279 Views
Last Modified: 2012-06-21
Hi, right now I'm trying to build a simple Progress bar using a TextField (with JDK 1.0.2), it can fill well, but I don't know how to drain the StringBuffer content for refill it. This is what I have:

import java.awt.*;
import java.lang.*;
import java.util.*;
import java.applet.*;
import java.io.*;

public class miBarraProg2 extends java.applet.Applet {
  TextField progreso;
  Button inicio;
  Label porcen1;
  Label porcen2;
 
  StringBuffer llena;
  String llena2;
  String agrega;
 
  public void init() {
    llena = new StringBuffer(40);
    llena2 = "";
    agrega = "|";
   
    progreso = new TextField(8);
    progreso.setEditable(false);
    inicio = new Button("Start the progress!");
    porcen1 = new Label("0% ");
    porcen2 = new Label("100%");
    add(porcen1);
    add(progreso);
    add(porcen2);
    add(inicio);
  }
 
  public boolean action (Event evt, Object what) {
    Object target=evt.target;
        if(target == inicio) {
        progreso.setText("");
       
        llena2 = "";
        //How do I drain the content of the StringBuffer?
       
         for (int x=1; x<30; x++) {
          llena2 = llena.append(agrega).toString();
          progreso.setText(llena2);
          for (int y=1; y<200; y++) {}  //a delay
         }
       return true;
       }
   return false;
  }  

}

Could somebody help me?. Thanks.

  Deladier.
0
Comment
Question by:Deladier
[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
1 Comment
 
LVL 1

Accepted Solution

by:
Hans_Klose earned 400 total points
ID: 1229506
public class miBarraProg2 extends java.applet.Applet
{
  TextField progreso;
  Button inicio;
  Label porcen1;
  Label porcen2;
   
  StringBuffer llena;
  String llena2;
  String agrega;
   
  public void init()
  {
    llena = new StringBuffer(40); // ? Why did you make it 40  
    llena2 = "";
    agrega = "|";
     
    progreso = new TextField(8);
    progreso.setEditable(false);
    inicio = new Button("Start the progress!");
    porcen1 = new Label("0% ");
    porcen2 = new Label("100%");
    add(porcen1);
    add(progreso);
    add(porcen2);
    add(inicio);
  }
   
  public boolean action (Event evt, Object what)
  {
    Object target=evt.target;
        if(target == inicio)
        {
           
                progreso.setText("");
         
                llena2 = "";
                //How do I drain the content of the StringBuffer?
         
                for (int x=1; x<30; x++)
                {
                    llena2 = llena.append(agrega).toString();
                    progreso.setText(llena2);
         
                    for (int y=1; y<900; y++) {}  //a delay
                }
           
           
            //  Here is a quick hack of what I think you could do.
            //  1. Start with a full buffer at the last position
            //  2. while you are above or equal to 0 change the char at x to space
            // Just be carefull with your indexes since you start at 1.
           
         
                System.out.println("Length of a buffer "+llena.length());
                for(int x= 28 ; x >= 0; x--)
                {
                    System.out.println("Here is x" + new Integer(x).toString() );
                   
                    llena.setCharAt(x,' ');
                    llena2 = llena.toString();
                    progreso.setText(llena2);
         
                    for (int y=1; y<900; y++) {}  //a delay    
                }
   
                return true;
               
    }
   return false;
 
  }
}

// I hope this works with 1.0.2 I have 1.2 but I attempted to make only the 1.0.2 api calls
0

Featured Post

Get 15 Days FREE Full-Featured Trial

Benefit from a mission critical IT monitoring with Monitis Premium or get it FREE for your entry level monitoring needs.
-Over 200,000 users
-More than 300,000 websites monitored
-Used in 197 countries
-Recommended by 98% of users

Question has a verified solution.

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

This was posted to the Netbeans forum a Feb, 2010 and I also sent it to Verisign. Who didn't help much in my struggles to get my application signed. ------------------------- Start The idea here is to target your cell phones with the correct…
Introduction Java can be integrated with native programs using an interface called JNI(Java Native Interface). Native programs are programs which can directly run on the processor. JNI is simply a naming and calling convention so that the JVM (Java…
This theoretical tutorial explains exceptions, reasons for exceptions, different categories of exception and exception hierarchy.
Viewers will learn how to properly install Eclipse with the necessary JDK, and will take a look at an introductory Java program. Download Eclipse installation zip file: Extract files from zip file: Download and install JDK 8: Open Eclipse and …
Suggested Courses
Course of the Month12 days, 7 hours left to enroll

777 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