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import java.io.*;import java.net.*;import java.awt.*;import java.awt.image.*;import java.awt.event.*;import javax.swing.*;import javax.swing.border.*;import javax.swing.event.*;//ChatClient code:public class ChatClient implements Runnable, WindowListener, ActionListener, ListSelectionListener{  protected String host;  protected int port;  public TextArea output;  protected TextField input;  protected TextArea temp;  SketchFrame window;   String yourname;GraphicsEnvironment e=GraphicsEnvironment.getLocalGraphicsEnvironment();String[] fontNames=e.getAvailableFontFamilyNames();private JList fontList=new JList (fontNames);String[] colorNames={"Red","Blue","Green","Black","Orange","Yellow","Pink","Gray","DarkGray","Cyan","White"};Color[] fontcolor={Color.red,Color.blue,Color.green,Color.black,Color.orange,Color.yellow,Color.pink,Color.gray,Color.darkGray,Color.cyan,Color.white};//private JList fontcolorList=new JList (fontcolor);private JList fontcolorList=new JList (colorNames);  Font f=new Font("SansSerif",Font.PLAIN,16);  Color c=new Color(0);public ChatClient(){}  public ChatClient (String host, int port, SketchFrame window) {    this.host = host;    this.port = port;    this.yourname=JOptionPane.showInputDialog("Enter Login name:");    window.setSize(100,100);    window.setBackground(Color.cyan);    output = new TextArea (5,30);    output.setEditable (false);    temp = new TextArea (5,30);    temp.setVisible(false);    input = new TextField(30);    input.setFont(f);    input.setForeground(Color.blue);    output.setFont(f);    output.setForeground(Color.blue);    input.addActionListener (this);    GridBagConstraints constraints = new GridBagConstraints();    window.getContentPane().setLayout(new FlowLayout(FlowLayout.CENTER));    window.getContentPane().setLayout(new BorderLayout(40,50));    window.getContentPane().add (temp,BorderLayout.NORTH);    constraints.insets =new Insets(10,10,10,10);    window.getContentPane().add (output,BorderLayout.CENTER);    window.getContentPane().add (input,BorderLayout.SOUTH);fontList.setValueIsAdjusting(true);fontList.setSelectionMode(ListSelectionModel.SINGLE_SELECTION);fontList.setSelectedValue(f.getFamily(),true);fontList.addListSelectionListener(this);JScrollPane chooseFont = new JScrollPane(fontList);chooseFont.setMinimumSize(new Dimension(15,20));chooseFont.setVisible(true);window.getContentPane().add (chooseFont,BorderLayout.WEST);fontcolorList.setValueIsAdjusting(true);fontcolorList.setSelectionMode(ListSelectionModel.SINGLE_SELECTION);fontcolorList.setSelectedValue(Color.blue,true);fontcolorList.addListSelectionListener(this);JScrollPane chooseFontColor = new JScrollPane(fontcolorList);chooseFontColor.setMinimumSize(new Dimension(15,20));chooseFontColor.setVisible(true);window.getContentPane().add (chooseFontColor,BorderLayout.EAST);window.pack();  }public void valueChanged(ListSelectionEvent e){Object st;if(!e.getValueIsAdjusting()){	f=new Font((String)fontList.getSelectedValue(),Font.PLAIN,16);	input.setFont(f);	output.setFont(f);	st=fontcolorList.getSelectedValue();        if(st=="Red")	{	input.setForeground(Color.red);	output.setForeground(Color.red);        //input.setForeground((Color)fontcolorList.getSelectedValue());	//output.setForeground((Color)fontcolorList.getSelectedValue());	}	if(st=="Blue")	{	input.setForeground(Color.blue);		output.setForeground(Color.blue);	}	if(st=="Green")	{	input.setForeground(Color.green);		output.setForeground(Color.green);	}	if(st=="Black")	{	input.setForeground(Color.black);		output.setForeground(Color.black);	}	if(st=="Orange")	{	input.setForeground(Color.orange);		output.setForeground(Color.orange);	}	if(st=="Yellow")	{	input.setForeground(Color.yellow);		output.setForeground(Color.yellow);	}	if(st=="Pink")	{	input.setForeground(Color.pink);		output.setForeground(Color.pink);	}	if(st=="Gray")	{	input.setForeground(Color.gray);		output.setForeground(Color.gray);	}	if(st=="DarkGray")	{	input.setForeground(Color.darkGray);		output.setForeground(Color.darkGray);	}	if(st=="Cyan")	{	input.setForeground(Color.cyan);		output.setForeground(Color.cyan);	}	if(st=="White")	{	input.setForeground(Color.white);		output.setForeground(Color.white);	}}}/*public String Fun(){	return (yourname);}*/public TextArea func(){	return(output);}public Insets getInsets()	{	return new Insets(10,10,10,10);	}  protected DataInputStream dataIn;  protected DataOutputStream dataOut;  protected Thread listener;  public synchronized void start () throws IOException {    if (listener == null) {		//output.append(yourname + " has logged on\n");		   //dataOut.writeUTF (yourname+" has logged off ");		   //dataOut.flush ();      Socket socket = new Socket (host, port);      try {        dataIn = new DataInputStream          (new BufferedInputStream (socket.getInputStream ()));        dataOut = new DataOutputStream          (new BufferedOutputStream (socket.getOutputStream ()));          dataOut.writeUTF (yourname+" has logged on\n ");      //dataOut.flush ();      } catch (IOException ex) {        socket.close ();        throw ex;      }      listener = new Thread (this);      listener.start ();      window.setVisible (true);    }  }  public synchronized void stop () throws IOException {    //window.setVisible (false);    if (listener != null) {      listener.interrupt ();       listener = null;      dataOut.close ();    }  }  public void run() {    try {      while (!Thread.interrupted ()) {        String line = dataIn.readUTF ();        //String message=yourname +" says:\n ";       //output.append ("\n"+message + line + "\n");       output.append (line + "\n");      }    } catch (IOException ex) {      handleIOException (ex);    }  }  protected synchronized void handleIOException (IOException ex) {    if (listener != null) {      output.append (ex + "\n");      input.setVisible (false);      window.validate ();      if (listener != Thread.currentThread ())        listener.interrupt ();      listener = null;      try {        dataOut.close ();      } catch (IOException ignored) {      }    }  }  public void windowOpened (WindowEvent event) {    input.requestFocus ();  }  public void windowClosing (WindowEvent event) {    try {      stop ();    } catch (IOException ex) {      ex.printStackTrace ();    }  }  public void windowClosed (WindowEvent event) {}  public void windowIconified (WindowEvent event) {}  public void windowDeiconified (WindowEvent event) {}  public void windowActivated (WindowEvent event) {}  public void windowDeactivated (WindowEvent event) {}  public void actionPerformed (ActionEvent event) {    try {      input.selectAll ();      System.out.println("usager a écrit un message");      dataOut.writeUTF (yourname+" says:\n "+event.getActionCommand ());      dataOut.flush ();    } catch (IOException ex) {      handleIOException (ex);    }  }}//End of chatClient code