Thread: Program hangs

when control gose to this method Application Freezes i want to show the results on the JTextField but as long as the program is downloading pages from links it remain still no output result shows in the text field

// here i call this method downloadpage
 for (Element link : links) {
            print(" * a: <%s>  (%s)", link.attr("abs:href"), trim(link.text(), 35));
           myField.setText(i+"%");
           downloadpage(link.attr("abs:href"),link.text());
 
 
 
        }

here is the method code

 url  = new URL(Link);
    String name;
    name = "D:\\net\\"+Name+".html";
    reader = new BufferedReader(new InputStreamReader(url.openStream()));
    writer = new BufferedWriter(new FileWriter(name));
      String line;
      while ((line = reader.readLine()) != null) {
 
         writer.write(line);
         writer.newLine();
      }
      reader.close();
      writer.close();

I'm a beginner Please Help Me

i didn't check the code

import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.DataInputStream;
import java.io.FileOutputStream;
import java.io.InputStreamReader;
import java.io.FileWriter;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.net.URL;
import java.net.URLConnection;
import java.util.logging.Level;
import java.util.logging.Logger;
import javax.swing.filechooser.FileSystemView;
import javax.swing.table.DefaultTableModel;
import javax.swing.table.JTableHeader;
import javax.swing.table.TableColumn;
import org.jsoup.Jsoup;
import org.jsoup.nodes.Document;
import org.jsoup.nodes.Element;
import org.jsoup.select.Elements;
 
public class OWD implements ActionListener,ItemListener {
 
JTextField textfield = new JTextField(15);
public void gui(){
JFrame downloader = new JFrame("Offline Web Page Downloader");
JButton button = new JButoon("download");
Container con1;
    con1 = downloader.getContentPane();
    con1.setLayout(new FlowLayout());
JPanel mypanel = new JPanel();
mypanel.add(button);
mypanel.add(textfield);
button.addActionListener(this);
con1.add(mypanel);
}
public void actionPerformed(ActionEvent e){
if(e.getSource == button)
{
	Document doc = Jsoup.connect(http://www.yahoo.com/).get();
        Elements links = doc.select("a[href]");
 
 
int i = 1;
        for (Element link : links) {
 
           textfield.setText(i+"%");
           downloadpage(link.attr("abs:href"),link.text());
 
 
 
        }
 
      }
}
public void downloadpage(String Link,String Name)throws Exception{
    url  = new URL(Link);
    String name;
    name = "D:\\net\\"+Name+".html";
    reader = new BufferedReader(new InputStreamReader(url.openStream()));
    writer = new BufferedWriter(new FileWriter(name));
      String line;
      while ((line = reader.readLine()) != null) {
 
         writer.write(line);
         writer.newLine();
      }
      reader.close();
      writer.close();
 
}
OWD()
{
	gui();
}
public static void main(String args[]){
	OWD od = new OWD();
}
}

but if i use work thread then where i call the function it says that can not find symbol downloadpage(string,string)

Originally Posted by Norm

To call a method in a class, you need a reference to that class. Pass a reference to the class with the method you are trying to call to the class where you are trying to call it.

And how can i do that
sorry brother but as i said i'm a Biginner Thanks

--- Update ---

And both method are in same class

--- Update ---

here i'm calling the function all this code is in a same class called OWD

        int i = 1;
        for (Element link : links) {
            print(" * a: <%s>  (%s)", link.attr("abs:href"), trim(link.text(), 35));
           myField.setText(i+"%");
           downloadpage(link.attr("abs:href"),link.text()); // here the Compiler says cannot find  symbol downloadpge Location class OWD
 
 
 
        }

this is how i'm doing is it correct

 SwingWorker worker = new SwingWorker() {
public void downloadpage(String Link,String Name)throws Exception{
    url  = new URL(Link);
    String name;
    name = "D:\\net\\"+Name+".html";
    reader = new BufferedReader(new InputStreamReader(url.openStream()));
    writer = new BufferedWriter(new FileWriter(name));
      String line;
      while ((line = reader.readLine()) != null) {
 
         writer.write(line);
         writer.newLine();
      }
      reader.close();
      writer.close();
 
}
 
    @Override
    protected Object doInBackground() throws Exception {
        throw new UnsupportedOperationException("Not supported yet."); //To change body of generated methods, choose Tools | Templates.
    }
 };

Please check it and tell me where is the error

import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.DataInputStream;
import java.io.FileOutputStream;
import java.io.InputStreamReader;
import java.io.FileWriter;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.net.URL;
import java.net.URLConnection;
import java.util.logging.Level;
import java.util.logging.Logger;
import javax.swing.filechooser.FileSystemView;
import javax.swing.table.DefaultTableModel;
import javax.swing.table.JTableHeader;
import javax.swing.table.TableColumn;
import org.jsoup.Jsoup;
import org.jsoup.nodes.Document;
import org.jsoup.nodes.Element;
import org.jsoup.select.Elements;
 
public class OWD implements ActionListener,ItemListener {
 
JTextField textfield = new JTextField(15);
public void gui(){
JFrame downloader = new JFrame("Offline Web Page Downloader");
JButton button = new JButoon("download");
Container con1;
    con1 = downloader.getContentPane();
    con1.setLayout(new FlowLayout());
JPanel mypanel = new JPanel();
mypanel.add(button);
mypanel.add(textfield);
button.addActionListener(this);
con1.add(mypanel);
}
public void actionPerformed(ActionEvent e){
if(e.getSource == button)
{
	Document doc = Jsoup.connect(http://www.yahoo.com/).get();
        Elements links = doc.select("a[href]");
 
 
int i = 1;
        for (Element link : links) {
 
           textfield.setText(i+"%");
           downloadpage(link.attr("abs:href"),link.text()); // here it says cannot find symbol download page 
 
 
 
        }
 
      }
}
SwingWorker worker = new SwingWorker() {
public void downloadpage(String Link,String Name)throws Exception{
    url  = new URL(Link);
    String name;
    name = "D:\\net\\"+Name+".html";
    reader = new BufferedReader(new InputStreamReader(url.openStream()));
    writer = new BufferedWriter(new FileWriter(name));
      String line;
      while ((line = reader.readLine()) != null) {
 
         writer.write(line);
         writer.newLine();
      }
      reader.close();
      writer.close();
 
}
    @Override
    protected Object doInBackground() throws Exception {
        throw new UnsupportedOperationException("Not supported yet."); //To change body of generated methods, choose Tools | Templates.
    }
 };
OWD()
{
	gui();
}
public static void main(String args[]){
	OWD od = new OWD();
}
}

at line number 52 and 61 please check it says cannot find symbol downloadpage in class owd

import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.DataInputStream;
import java.io.FileOutputStream;
import java.io.InputStreamReader;
import java.io.FileWriter;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.net.URL;
import java.net.URLConnection;
import java.util.logging.Level;
import java.util.logging.Logger;
import javax.swing.filechooser.FileSystemView;
import javax.swing.table.DefaultTableModel;
import javax.swing.table.JTableHeader;
import javax.swing.table.TableColumn;
import org.jsoup.Jsoup;
import org.jsoup.nodes.Document;
import org.jsoup.nodes.Element;
import org.jsoup.select.Elements;
 
public class OWD implements ActionListener,ItemListener {
 
JTextField textfield = new JTextField(15);
public void gui(){
JFrame downloader = new JFrame("Offline Web Page Downloader");
JButton button = new JButoon("download");
Container con1;
    con1 = downloader.getContentPane();
    con1.setLayout(new FlowLayout());
JPanel mypanel = new JPanel();
mypanel.add(button);
mypanel.add(textfield);
button.addActionListener(this);
con1.add(mypanel);
}
public void actionPerformed(ActionEvent e){
if(e.getSource == button)
{
	Document doc = Jsoup.connect(http://www.yahoo.com/).get();
        Elements links = doc.select("a[href]");
 
 
int i = 1;
        for (Element link : links) {
 
           textfield.setText(i+"%");
           downloadpage(link.attr("abs:href"),link.text()); // here it says cannot find symbol download page 
 
 
 
        }
 
      }
}
SwingWorker worker = new SwingWorker() {
public void downloadpage(String Link,String Name)throws Exception{ // here is the method which i'm calling above
    url  = new URL(Link);
    String name;
    name = "D:\\net\\"+Name+".html";
    reader = new BufferedReader(new InputStreamReader(url.openStream()));
    writer = new BufferedWriter(new FileWriter(name));
      String line;
      while ((line = reader.readLine()) != null) {
 
         writer.write(line);
         writer.newLine();
      }
      reader.close();
      writer.close();
 
}
    @Override
    protected Object doInBackground() throws Exception {
        throw new UnsupportedOperationException("Not supported yet."); //To change body of generated methods, choose Tools | Templates.
    }
 };
OWD()
{
	gui();
}
public static void main(String args[]){
	OWD od = new OWD();
}
}

Here at the line number 34 compiler generats an syntax error that "Can not find symbol download in class javafxapplication6;
"

package javafxapplication6;
 
import javafx.application.Application;
import javafx.event.ActionEvent;
import javafx.event.EventHandler;
import javafx.scene.Scene;
import javafx.scene.control.Button;
import javafx.scene.layout.StackPane;
import javafx.stage.Stage;
import javax.swing.SwingWorker;
 
 
public class JavaFXApplication6 {
 
 
 
 
SwingWorker worker = new SwingWorker(){    
    void download(){
        System.out.println("I'm downloading");
    }
 
    @Override
    protected Object doInBackground() throws Exception {
        throw new UnsupportedOperationException("Not supported yet."); //To change body of generated methods, choose Tools | Templates.
    }
};
    void run(){
        for(int i = 0;i<10;i++){
            download();
        }
    }
    public static void main(String[] args) {
 
    }
}

I will appreciate your help if you make a small program for me

Thanks