Solved

A question for Diakov

Posted on 1998-10-19
1
257 Views
Last Modified: 2010-03-30
Hey.
Here are the code for text reading and splitting, it has still some errors. Can you answer?

 my text file has following values: title;a1;40;a2;33;a4;50;

      Here is how I wrote the code, but it doesn't work yet


       String param0 = "";
              try
              {      
                  String url_string = String.valueOf(getParameter("text"));
                  URL a;
                  URLConnection conn;
                  a = new URL(url_string);
                  conn = a.openConnection();
                  conn.setUseCaches(false);
                  DataInputStream dis = new DataInputStream(conn.getInputStream());
                  String inputLine = "";
                  while ((inputLine=dis.readLine())!= null)
                  {
                         param0 =param0 + inputLine;
                  }
                  dis.close();
                 }catch (java.io.IOException e){}
                 java.util.StringTokenizer st  = new java.util.StringTokenizer(param0, ";");
                 while(param0 != null)
                 {
                     if( je==0)
                     {
                      //Firts variable is title
                         title=st.nextToken();
                     }
                    //don't go any more in the string above:
                     je=1;
                   //get labels:
                     labels[i] = st.nextToken();
                   //get values:
                     values[i] = Integer.parseInt(st.nextToken());
                    //drawing color:
                     colors[i] = Color.black;
                    // number of variables:
                     columns=columns+1;
                     if (values[i] > max)
                     {
                         max = values[i];
                     }
                     i++;
                }
0
Comment
Question by:tittapo
[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 8

Accepted Solution

by:
diakov earned 50 total points
ID: 1225996
Hello 'tittapo',

This is a working example. I've put the test file on my web server.


//file test_tokenizer.java
import java.net.*;
import java.io.*;

public class test_tokenizer
{

  public static void main(String[] argv)
  {
    String param0 = "";
    try
    {        
      String url_string = "http://hermes.cs.utwente.nl:5111/altered_serve/test.txt";
      URL a;
      URLConnection conn;
      a = new URL(url_string);
      conn = a.openConnection();
      conn.setUseCaches(false);
      DataInputStream dis = new DataInputStream(conn.getInputStream());
      String inputLine = "";
      while ((inputLine=dis.readLine())!= null)
        param0 =param0 + inputLine;
      dis.close();
    }
    catch (Exception e)
    {
      e.printStackTrace();
    }
    java.util.StringTokenizer st  = new java.util.StringTokenizer(param0, ";");
    while(st.hasMoreTokens())
    {
      System.out.println(st.nextToken());
    }
  }
}

The basic idea of the tokenizers is calling the nextToken() until hasMoreTokens() returns false. You can linearly call nextToken several times, but it is a good idea to test for hasMoreTokens after each nextToken().

Hope this helped,
  Nik

0

Featured Post

[Webinar] How Hackers Steal Your Credentials

Do You Know How Hackers Steal Your Credentials? Join us and Skyport Systems to learn how hackers steal your credentials and why Active Directory must be secure to stop them. Thursday, July 13, 2017 10:00 A.M. PDT

Question has a verified solution.

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

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 …
In this post we will learn different types of Android Layout and some basics of an Android App.
Viewers will learn about the different types of variables in Java and how to declare them. Decide the type of variable desired: Put the keyword corresponding to the type of variable in front of the variable name: Use the equal sign to assign a v…
Viewers will learn about the regular for loop in Java and how to use it. Definition: Break the for loop down into 3 parts: Syntax when using for loops: Example using a for loop:

707 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