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POthreads and swing components in java
 

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    <p>As you see, I've been researching and tried to set a thread in <strong>main.java</strong> class. This is the main method:</p> <pre><code>public static void main(String args[]) { java.awt.EventQueue.invokeLater(new Runnable() { public void run() { new main().setVisible(true); check ch = new check(); ch.start(); } }); } </code></pre> <p>Main method calls a thread called <strong>ch</strong> , from <strong>check.java</strong> class.</p> <p>This is the thread class:</p> <pre><code>public class check extends Thread { public JTextArea estado = new JTextArea(); public JTextField updatedVersion = new JTextField(); public JLabel updatedLabel = new JLabel(); public String catchUpdatedVersion; int UPDATENUMBER; int CURRENTNUMBER; public void run() { String infURL = "https://thread.googlecode.com/svn/trunk/thread.inf"; String name = "thread.inf"; File file = new File(name); try { URLConnection conn = new URL(infURL).openConnection(); conn.connect(); estado.append("Conectando al servidor..."); estado.append(System.getProperty("line.separator")); estado.append(" -- Buscando actualizaciones... --"); estado.append(System.getProperty("line.separator")); InputStream in = conn.getInputStream(); OutputStream out = new FileOutputStream(file); int b = 0; while (b != -1) { b = in.read(); if (b != -1) { out.write(b); } } out.close(); in.close(); } catch (MalformedURLException ex) { } catch (IOException ioe) { } String fileToReadUpdatedVersion = "thread.inf"; try { BufferedReader br = new BufferedReader( new FileReader(fileToReadUpdatedVersion)); String brr = br.readLine(); catchUpdatedVersion = brr.substring(34,42); String catchUpdatedShortVersion = brr.substring(15,16); UPDATENUMBER = Integer.parseInt(catchUpdatedShortVersion); String fileToReadCurrentVer = "thread.inf"; BufferedReader brrw = new BufferedReader( new FileReader(fileToReadCurrentVer)); String brrwREAD = brrw.readLine(); String catchCurrentShortVersion = brrwREAD.substring(15,16); CURRENTNUMBER = Integer.parseInt(catchCurrentShortVersion); if (CURRENTNUMBER &gt;= UPDATENUMBER) { estado.setText("No se han encontrado actualizaciones."); } else { updatedVersion.setForeground(new Color(0,102,0)); updatedLabel.setForeground(new Color(0,153,51)); updatedVersion.setText(catchUpdatedVersion); estado.append("-------------------" + "NUEVA ACTUALIZACIÓN DISPONIBLE: " + catchUpdatedVersion + " -------------------");; estado.append(System.getProperty("line.separator")); estado.append("Descargando actualizaciones... " + "Espere por favor, no cierre este " + "programa hasta que esté completado..."); try { String updateURL = "https://thread.googlecode.com/" + "svn/trunk/thread.inf"; String updatedname = (catchUpdatedVersion + ".zip"); File updatedfile = new File(updatedname); URLConnection conn = new URL(updateURL).openConnection(); conn.connect(); estado.append(System.getProperty("line.separator")); estado.append(" Archivo actual: " + updatedname); estado.append(System.getProperty("line.separator")); estado.append(" Tamaño: " + conn.getContentLength() / 1000 / 1000 + " MB"); InputStream in = conn.getInputStream(); OutputStream out = new FileOutputStream(updatedfile); int c = 0; while (c != -1) { c = in.read(); if (c != -1) { out.write(c); } } out.close(); in.close(); } catch (MalformedURLException ex) { ex.printStackTrace(); } } } catch (IOException ioe) { System.out.println(ioe); ioe.printStackTrace(); } } } </code></pre> <p>When I run the program, the thread does not work fine. It is supposed to download a file and then display its progress in a JTextArea in <strong>main.java</strong> class. It does download the file, but nothing appears in JTextArea. </p> <p>Where is my mistake?</p> <p>EDIT: Showing all the code.</p>
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    1. USSeba Paz
    1. USSeba Paz
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    1. COThe problem is not displaying and you haven't shown the code that's supposed to be displaying...
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      1. USSotirios Delimanolis
    2. COTake care that gui works in the Event Dispatch Thread.
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    3. CO@SotiriosDelimanolis ok. I put all the code
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      1. USSeba Paz
 

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