exception

this is my code:

import javax.swing.*;

import java.util.*;

import java.awt.*;

import java.awt.event.*;

import java.io.*;

import java.net.*;

public class Teacher1 extends javax.swing.JFrame implements Runnable{

String select;

private File mediaFile ;

private URL fileURL;

String filename;

int i=0;

String aa,r,reem;

String a="";

URL u;

Vector name=new Vector();

Vectorurl=new Vector();

private InetAddress ip;

private DatagramSocket sendSocket;

private DatagramSocket receiveSocket;

int std_port;

int port=5000;

/** Creates new form Teacher1 */

// public Vector name,url;

public Teacher1() {

try

{

sendSocket = new DatagramSocket();

receiveSocket = new DatagramSocket(6666);

}

catch(Exception e)

{

System.out.println(e);

}

initComponents();

// show();

}

public void paint(Graphics g){

super.paint(g);

g.setColor(Color.BLACK);

g.fillArc(-250,-30,600,700,0,360);

g.setColor(new Color(195, 57, 0));

g.drawArc(-250,-30,598,700,0,360);

}

/** This method is called from within the constructor to

* initialize the form.

* WARNING: Do NOT modify this code. The content of this method is

* always regenerated by the Form Editor.

*/

// <editor-fold defaultstate="collapsed" desc=" Generated Code ">

private void initComponents() {

jPanel1 = new javax.swing.JPanel();

addF = new javax.swing.JButton();

removeF = new javax.swing.JButton();

start = new javax.swing.JButton();

list1 = new java.awt.List();

jLabel1 = new javax.swing.JLabel();

jLabel2 = new javax.swing.JLabel();

getContentPane().setLayout(null);

setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);

getContentPane().setBackground(new java.awt.Color(255, 186, 0));

jPanel1.setLayout(null);

jPanel1.setBackground(new java.awt.Color(195, 57, 0));

jPanel1.setBorder(new javax.swing.border.CompoundBorder());

addF.setBackground(new java.awt.Color(255, 186, 0));

addF.setFont(new java.awt.Font("Comic Sans MS", 1, 12));

addF.setText("Add Files");

addF.setBorder(new javax.swing.border.EmptyBorder(new java.awt.Insets(1, 1, 1, 1)));

addF.addActionListener(new java.awt.event.ActionListener() {

public void actionPerformed(java.awt.event.ActionEvent evt) {

addFActionPerformed(evt);

}

});

jPanel1.add(addF);

addF.setBounds(0, 190, 140, 40);

removeF.setBackground(new java.awt.Color(255, 186, 0));

removeF.setFont(new java.awt.Font("Comic Sans MS", 1, 12));

removeF.setBorder(new javax.swing.border.EmptyBorder(new java.awt.Insets(1, 1, 1, 1)));

removeF.setText("Remove File");

removeF.addActionListener(new java.awt.event.ActionListener() {

public void actionPerformed(java.awt.event.ActionEvent evt) {

removeFActionPerformed(evt);

}

});

jPanel1.add(removeF);

removeF.setBounds(0, 280, 140, 40);

start.setBackground(new java.awt.Color(255, 186, 0));

start.setFont(new java.awt.Font("Comic Sans MS", 1, 11));

start.setText("Start Live Lecture");

start.setBorder(new javax.swing.border.EmptyBorder(new java.awt.Insets(1, 1, 1, 1)));

start.addActionListener(new java.awt.event.ActionListener() {

public void actionPerformed(java.awt.event.ActionEvent evt) {

startActionPerformed(evt);

}

});

list1.addActionListener(new java.awt.event.ActionListener() {

public void actionPerformed(java.awt.event.ActionEvent evt) {

list1ActionPerformed(evt);

}

});

jPanel1.add(start);

start.setBounds(0, 380, 140, 40);

getContentPane().add(jPanel1);

jPanel1.setBounds(450, 0, 140, 570);

list1.setBackground(new java.awt.Color(230, 215, 172));

getContentPane().add(list1);

list1.setBounds(40, 120, 180, 370);

jLabel1.setFont(new java.awt.Font("Comic Sans MS", 1, 14));

jLabel1.setText("List Of Files");

getContentPane().add(jLabel1);

jLabel1.setBounds(20, 60, 170, 50);

jLabel2.setIcon(new javax.swing.ImageIcon("C:\\Documents and Settings\\Heyam\\My Documents\\e_learning.jpg"));

//getContentPane().add(jLabel2);

jPanel1.add(jLabel2);

jLabel2.setBounds(-3, 40, 150, 100);

java.awt.Dimension screenSize = java.awt.Toolkit.getDefaultToolkit().getScreenSize();

setBounds((screenSize.width-600)/2, (screenSize.height-600)/2, 600, 600);

}

// </editor-fold>

private void startActionPerformed(java.awt.event.ActionEvent evt) {

// TODO add your handling code here:

new teacher_Live().show();

}

private void list1ActionPerformed(java.awt.event.ActionEvent evt) {

// TODO add your handling code here:

select=list1.getSelectedItem();

}

private void removeFActionPerformed(java.awt.event.ActionEvent evt) {

// TODO add your handling code here:

System.out.print("*******"+select);

list1.remove(select);

}

private void addFActionPerformed(java.awt.event.ActionEvent evt) {

// TODO add your handling code here:

mediaFile = getFile();

if ( mediaFile != null ) {

// obtain URL from file

try {

fileURL = mediaFile.toURL();

//System.out.println(mediaFile);

}

catch ( MalformedURLException badURL ) {

badURL.printStackTrace();

JOptionPane.showMessageDialog( null, "Error"

);

}

list1.add(mediaFile.getName());

listing();

System.out.print(aa +"wwwww" +u);

} //end if

}// end actionPerformed

/**

* @param args the command line arguments

*/

public static void main(String args[]) {

Teacher1 application = new Teacher1();

new Teacher1().setVisible(true);

//application.waitForPackets();

}

// Variables declaration - do not modify

private javax.swing.JButton addF;

private javax.swing.JLabel jLabel1;

private javax.swing.JLabel jLabel2;

private javax.swing.JPanel jPanel1;

private java.awt.List list1;

private javax.swing.JButton removeF;

private javax.swing.JButton start;

// End of variables declaration

// get file from computer

public File getFile()

{

JFileChooser fileChooser = new JFileChooser();

fileChooser.setFileSelectionMode(

JFileChooser.FILES_ONLY );

int result = fileChooser.showOpenDialog( this );

if ( result == JFileChooser.CANCEL_OPTION )

return null;

else

return fileChooser.getSelectedFile();

}

public void listing(){

if ( mediaFile != null ) {

// obtain URL from file

try {

fileURL = mediaFile.toURL();

filename=mediaFile.getName();

}

catch ( MalformedURLException badURL ) {

badURL.printStackTrace();

JOptionPane.showMessageDialog( null, "Error"

);

}

}//end if

name.add(i,filename);

url.add(i,fileURL);

aa=(String)name.get(i);

u=(URL)url.get(i);

a= a +"the file is>>>>"+ aa +"@"+u+"#";

System.out.print(a +"\n");

i++;

}//method listing

/************************************************/

public void run()

{

InetAddress std_address;

try

{

while(true)

{

byte[] receivedData = new byte[1024];

DatagramPacket receivedPacket = new DatagramPacket(receivedData,receivedData.length);

receiveSocket.receive(receivedPacket);

std_address = receivedPacket.getAddress();

ip = std_address;

System.out.println(""+std_address);

String s = new String(receivedPacket.getData()).trim();

System.out.println(s);

//StringTokenizer tok=new StringTokenizer(s);

//s=tok.nextToken();

if(s.compareTo("@Ports@")==0)

{

std_port = Integer.parseInt(s);

}

/*if(s.compareTo("@ListRequest@")==0)

sendFileNames(rcvAddress,s);

if(s.compareTo("@LiveLecture@")==0)

{

boolean x = liveLect.getLiveLectuteBoolean();

System.out.println("hi xxxxxxxxx "+x);

if(x==true)

{

s=tok.nextToken();

String k = "Student "+s+" trys to connect with live lecture";

k+= "\nDo you want to accept him ?";

int selection = JOptionPane.showConfirmDialog(null,k,"Accept",JOptionPane.OK_CANCEL_OPTION,JOptionPane.INFORMATION_MESSAGE,null);

if(selection == JOptionPane.OK_OPTION)

{

liveLect.studentList.addItem(s);

//listToAddress.addItem(""+rcvAddress);

sendState(rcvAddress,"@LiveLecture@yes yes");

s=tok.nextToken();

int vidPort = Integer.parseInt(s);

s=tok.nextToken();

int audPort = Integer.parseInt(s);

liveLect.Transmit(vidPort);

liveLect.audioTransmitter(audPort);

}

else

sendState(rcvAddress,"@LiveLecture@yes no");

}

else

{

sendState(rcvAddress,"@LiveLecture@no");

}

}

if(s.compareTo("@Intersection@")==0)

{

System.out.println("Intersection");

liveLect.allowButton.setEnabled(true);

liveLect.denyButton.setEnabled(true);

liveLect.draw( true );

liveLect.intersectLabel.setText("There is an Intersection");

}

if(s.compareTo("@play@")==0)

{

s=tok.nextToken();

String t = getURL(s,ip);

System.out.println(t);

if(t.trim().compareToIgnoreCase("") == 0)

{

sendState(rcvAddress,"@play@no");

}

else

{

sendState(rcvAddress,"@play@yes");

transmitter = new Transmitter(t, 9500, 9600);

Thread thr1 = new Thread(transmitter);

thr1.start();

}

}

if(s.compareTo("@Question@")==0)

{

//System.out.println("Intersection");

receivedData = new byte[1024];

receivedPacket = new DatagramPacket(receivedData,receivedData.length);

receiveSocket1.receive(receivedPacket);

String packRcv = new String(receivedPacket.getData()).trim();

liveLect.chatTextArea.append(packRcv+"\n");

liveLect.sendButton.setEnabled(true);

liveLect.writeArea.setEnabled(true);

}*/

}//end while

}

catch(Exception e)

{

System.out.println(e);

}

}

}//frame

student14a at 2007-7-14 1:16:57 >