keffie91

Originally Posted by keffie91

Hello I have created an optionwindow for my chat program, but if i open the option window and click the cross in the right corner, not only the optionwindow terminates but also the chatprogram. Can someone tell what i can do about it, and are there other ways to make a kind of optionwindow?

thanks keffie91

this is the source:

ChatProgram.java

Java Code:

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.event.*;
import javax.swing.border.*;
import java.net.*;
import java.io.*;
public class ChatProgram extends JFrame implements ActionListener{
    JMenuBar mbar = new JMenuBar();
    JMenu options = new JMenu("Options");
    JMenuItem dcm = new JMenuItem("Disconnect");
    JMenuItem optm = new JMenuItem("Options");
    JPanel toppanel = new JPanel();    
    JButton disconnect = new JButton("Disconnect"); // disconnectbutton
    JTextField username = new JTextField("Anonymous"); // username
    JLabel usertxt = new JLabel("Username:"); // username label
    JTextArea mess = new JTextArea(); // display the messages
    JTextField write = new JTextField(); // write a new message
    MulticastSocket so; // MulticastSocket
    InetAddress iadr; // multicast adress
    int port; //port to listen to
        
    public ChatProgram(String groupAddr, int portNo) throws IOException{
        // The parameters
        iadr = InetAddress.getByName(groupAddr);
        port = portNo;
        
        // create socket and start communication
        so = new MulticastSocket(port);
        so.joinGroup(iadr);
        new Receiver(so, mess);
        sendMessage("Connected");
        
        setJMenuBar(mbar);
        mbar.add(options);
        options.add(optm);
        options.add(dcm);
        getContentPane().setLayout(new BoxLayout(getContentPane(),BoxLayout.Y_AXIS));
        getContentPane().add(toppanel);
        getContentPane().add(disconnect);
        getContentPane().add(mess);
        getContentPane().add(write);
        
        toppanel.setLayout(new GridLayout(1,2));
        toppanel.add(usertxt);toppanel.add(username);
        
        mess.setBorder(new EtchedBorder(EtchedBorder.LOWERED));
        mess.setEditable(false);
        
        write.addActionListener(this);
        disconnect.addActionListener(this);
        dcm.addActionListener(this);
        optm.addActionListener(this);
        setVisible(true);
        setResizable(false);
        setSize(500,400);
        setTitle("ChatProgram");
        setDefaultCloseOperation(EXIT_ON_CLOSE);
    }
    
    public void actionPerformed(ActionEvent e){
        if(e.getSource() == optm){
            // open a new OptionWindow
            new OptionWindow();
        }
        if(e.getSource() == write){
            // The user has written the message
            sendMessage(write.getText());
            write.setText("");
        }
        if(e.getSource() == disconnect || e.getSource() == dcm){
            // The user has pressed the disconnect button
            sendMessage("Disconnected");
            try{
                so.leaveGroup(iadr);
            }
            catch(IOException ie){
                mess.append("Cannot disconnect \n");
            }
            so.close();
            dispose();
            System.exit(0);
        }
    }
    
    private void sendMessage(String s){
        //convert the message to an array of bytes
        byte[] data = ( username.getText() + ": " + s).getBytes();
        //create and send the datagram packet
        DatagramPacket packet =
        new DatagramPacket(data, data.length, iadr, port);
        try{so.send(packet);}catch(IOException e){ mess.append("something went wrong");}
        
    }
    
    
    public static void main(String[] args) throws IOException {
        JFrame.setDefaultLookAndFeelDecorated(true);
        new ChatProgram("235.110.110.1",16645);
    }

}

class Receiver implements Runnable{
    Thread activity = new Thread(this);
    MulticastSocket so;
    JTextArea txt;
    
    //constructor
    Receiver(MulticastSocket sock, JTextArea txtAr){
        so = sock;
        txt = txtAr;
        activity.start();
    }
    public void run(){
        byte[] data = new byte[1024];
        while (true)
            try{
                //create datagram for reception
              DatagramPacket packet = new DatagramPacket(data, data.length);
                
              //wait for next message
              so.receive(packet);
              
              // convert the message to a string
              String mess = new String(data, 0, packet.getLength());
                  txt.append(mess + "\n");  // dusplay the message
            
            }
            catch(IOException e){
                break; // occurs when so is closed
            }
    }
}

OptionWindow.java

Java Code:

import java.awt.*;
import javax.swing.*;
public class OptionWindow extends JFrame {
    //JPanels to add the other components to
    JPanel p1 = new JPanel(); 
    JPanel p2 = new JPanel(); 
    JPanel p3 = new JPanel(); 
    JPanel p4 = new JPanel(); 
    JPanel p5 = new JPanel(); 
    public OptionWindow(){
        Container c = getContentPane();
        c.setLayout(new GridLayout(5,2));
        c.add(p1);c.add(p2);c.add(p3);c.add(p4);c.add(p5);
        
        
        setVisible(true);
        setSize(200,300);
        setDefaultCloseOperation(EXIT_ON_CLOSE);
    }
    public static void main(String[] args){
        new OptionWindow();
    }
}