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Progress bar with a TextField (JDK 1.0.2)

Posted on 1998-12-14
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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.
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Question by:Deladier
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Accepted Solution

by:
Hans_Klose earned 100 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
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