import java.awt.*;
import java.net.*;


public class AddressFrameSolution extends Frame
{
	public AddressFrameSolution()
	{
          SymWindow aSymWindow = new SymWindow();
	  this.addWindowListener(aSymWindow);
	  SymAction lSymAction = new SymAction();
          goButton.addActionListener(lSymAction);
	  setLayout(null);
	  setSize(405,305);
	  setVisible(false);
	  goButton.setLabel("Go");
	  add(goButton);
	  goButton.setBackground(java.awt.Color.lightGray);
	  goButton.setBounds(48,48,69,30);
	  add(ipAddress);
	  ipAddress.setBounds(48,132,208,25);
	  add(symbolicAddress);
	  symbolicAddress.setBounds(48,192,209,28);
	  ipLabel.setText("ipAddress");
	  add(ipLabel);
	  ipLabel.setBounds(48,96,100,40);
	  symbolicLabel.setText("Symbolic address");
	  add(symbolicLabel);
	  symbolicLabel.setBounds(48,156,100,40);
	  setTitle("Ex21");
	}

	public AddressFrameSolution(String title)
	{
          this();
	  setTitle(title);
	}

	static public void main(String args[])
	{
	   try
	   {
    	      (
                 new AddressFrameSolution()).setVisible(true);
           }
           catch (Throwable t)
           {
	      System.err.println(t);
	      t.printStackTrace();
	      //Ensure the application exits with an error condition.
	      System.exit(1);
	   }
	}

	public void addNotify()
	{
	   // Record the size of the window prior to calling parents addNotify.
	   Dimension d = getSize();

	   super.addNotify();

	   if (fComponentsAdjusted)
	      return;

	   // Adjust components according to the insets
	   setSize(getInsets().left + getInsets().right +
               d.width, getInsets().top + getInsets().bottom + d.height);
	   Component components[] = getComponents();
	   for (int i = 0; i < components.length; i++)
	   {
	      Point p = components[i].getLocation();
	      p.translate(getInsets().left, getInsets().top);
	      components[i].setLocation(p);
           }
           fComponentsAdjusted = true;
	}

	// Used for addNotify check.
	boolean fComponentsAdjusted = false;


	java.awt.Button goButton = new java.awt.Button();
	java.awt.TextField ipAddress = new java.awt.TextField();
	java.awt.TextField symbolicAddress = new java.awt.TextField();
	java.awt.Label ipLabel = new java.awt.Label();
	java.awt.Label symbolicLabel = new java.awt.Label();


	class SymWindow extends java.awt.event.WindowAdapter
	{
	   public void windowClosing(java.awt.event.WindowEvent event)
	   {
	      Object object = event.getSource();
	      if (object == AddressFrameSolution.this)
	         Frame1_WindowClosing(event);
           }
	}

	void Frame1_WindowClosing(java.awt.event.WindowEvent event)
	{
	   Frame1_WindowClosing_Interaction1(event);
	}


	void Frame1_WindowClosing_Interaction1(java.awt.event.WindowEvent event)
	{
	   try {
              System.exit(0);
	   } catch (Exception e) {
	   }
	}


class SymAction implements java.awt.event.ActionListener
{
public void actionPerformed(java.awt.event.ActionEvent event)
{
   Object object = event.getSource();
   if (object == goButton)
      goButton_ActionPerformed(event);
}
}

 //****************************************************************************
 //End of ignorable code
 //****************************************************************************

        void goButton_ActionPerformed(java.awt.event.ActionEvent event)
	{
        try
        {
           String dottedQuadString = ipAddress.getText();
           InetAddress address = InetAddress.getByName(dottedQuadString);
           symbolicAddress.setText(address.getHostName());
        }
        catch (Exception exc) {}
	}

}


-------

//   ECHO FRAME


import java.awt.*;
import java.net.*;
import java.io.*;

public class EchoFrameSolution extends Frame
{
	private Socket sock;
        private BufferedReader bf;
        private PrintWriter pw;

//*****************************************************************************
//Ignore code until next asterisks, all it dos is to set up a set of
//visual objects for the exercise
//*****************************************************************************

        public EchoFrameSolution()
	{
	   SymWindow aSymWindow = new SymWindow();
           this.addWindowListener(aSymWindow);
	   SymAction lSymAction = new SymAction();
           goButton.addActionListener(lSymAction);
	   setLayout(null);
	   setSize(405,305);
	   setVisible(false);
	   goButton.setLabel("Go");
	   add(goButton);
	   goButton.setBackground(java.awt.Color.lightGray);
	   goButton.setBounds(36,36,72,24);
           add(messageField);
           messageField.setBounds(36,108,241,24);
	   add(replyField);
	   replyField.setBounds(36,168,241,24);
	   add(compField);
	   compField.setBounds(36,228,241,24);
	   messagelabel.setText("Message");
	   add(messagelabel);
	   messagelabel.setBounds(36,72,100,40);
	   replyLabel.setText("Reply");
	   add(replyLabel);
	   replyLabel.setBounds(36,144,48,24);
	   nameLabel.setText("Computer name");
	   add(nameLabel);
	   nameLabel.setBounds(36,192,100,40);
	   setTitle("Exercise 2.2");
	}

	public EchoFrameSolution(String title)
	{
	   this();
	   setTitle(title);
	}

	static public void main(String args[])
	{
	   try
	      {
              //Create a new instance of our application's frame, and make it visible.
              (new EchoFrameSolution()).setVisible(true);
              }
	   catch (Throwable t)
	   {
	      System.err.println(t);
	      t.printStackTrace();
	      //Ensure the application exits with an error condition.
	      System.exit(1);
	   }
	}

	public void addNotify()
	{
	   // Record the size of the window prior to calling parents addNotify.
	   Dimension d = getSize();
	   super.addNotify();
	   if (fComponentsAdjusted)
	      return;
	   // Adjust components according to the insets
	   setSize(getInsets().left + getInsets().right + d.width, getInsets().top + getInsets().bottom + d.height);
	   Component components[] = getComponents();
	   for (int i = 0; i < components.length; i++)
	   {
              Point p = components[i].getLocation();
	      p.translate(getInsets().left, getInsets().top);
              components[i].setLocation(p);
	   }
          fComponentsAdjusted = true;
	}

	// Used for addNotify check.
	boolean fComponentsAdjusted = false;

	java.awt.Button goButton = new java.awt.Button();
	java.awt.TextField messageField = new java.awt.TextField();
	java.awt.TextField replyField = new java.awt.TextField();
	java.awt.TextField compField = new java.awt.TextField();
	java.awt.Label messagelabel = new java.awt.Label();
	java.awt.Label replyLabel = new java.awt.Label();
	java.awt.Label nameLabel = new java.awt.Label();

	class SymWindow extends java.awt.event.WindowAdapter
	{
	 public void windowClosing(java.awt.event.WindowEvent event)
	 {
	   Object object = event.getSource();
	   if (object == EchoFrameSolution.this)
              Frame1_WindowClosing(event);
          }
	}

	void Frame1_WindowClosing(java.awt.event.WindowEvent event)
	{
		Frame1_WindowClosing_Interaction1(event);
	}


	void Frame1_WindowClosing_Interaction1(java.awt.event.WindowEvent event)
	{
           try {
             System.exit(0);
            } catch (Exception e) {
         }
	}


class SymAction implements java.awt.event.ActionListener
{
public void actionPerformed(java.awt.event.ActionEvent event)
{
   Object object = event.getSource();
   if (object == goButton)
      goButton_ActionPerformed(event);
}
}

//*****************************************************************************
//End of ignored section
//*****************************************************************************

        void goButton_ActionPerformed(java.awt.event.ActionEvent event)
	{
        try
        {
           //Set up socket and streams on designated computer
           sock = new Socket(compField.getText(),7);
           bf= new BufferedReader(new InputStreamReader(sock.getInputStream()));
           pw = new PrintWriter(sock.getOutputStream(),true);
           //Send message to computer
           String message = messageField.getText();
           System.out.println(""+message);
           pw.println(message);
           //Get message back from computer
           String reply = bf.readLine();
           //Display it
           replyField.setText(reply);
      }
      catch(Exception ex){
         System.out.println("Problem with connection"+ex);}
	}

}


---------


//Name Client



import java.awt.*;
import java.io.*;
import java.net.*;

public class NameClientSolution extends Frame
{
//Instance variables for net connection
static Socket ss = null;
static InputStream is =null;
static BufferedReader bf = null;
static OutputStream os = null;
static PrintWriter pw = null;

//*****************************************************************************
//Ignore the code up to the next line of asterisks
//it just sets up the visual objects for the exercise
//*****************************************************************************

public NameClientSolution()
{
   SymWindow aSymWindow = new SymWindow();
   this.addWindowListener(aSymWindow);
   SymAction lSymAction = new SymAction();
   gobutton.addActionListener(lSymAction);
   setLayout(null);
   setSize(405,305);
   setVisible(false);
   gobutton.setLabel("Go");
   add(gobutton);
   gobutton.setBackground(java.awt.Color.lightGray);
   gobutton.setBounds(36,60,60,24);
   add(nameField);
   nameField.setBounds(36,144,243,27);
   add(addressField);
   addressField.setBounds(36,216,243,27);
   nameLabel.setText("Name");
   add(nameLabel);
   nameLabel.setBounds(36,120,60,24);
   addressLabel.setText("Address");
   add(addressLabel);
   addressLabel.setBounds(36,180,60,24);
   setTitle("Exercise 2.3 Client");
}

public NameClientSolution(String title)
{
   this();
   setTitle(title);
}

static public void main(String args[])
{
    try
    {
       ss = new Socket(InetAddress.getLocalHost(),1024);
       // Set up the streams which the clients will access
       is = ss.getInputStream();
       bf = new BufferedReader(new InputStreamReader(is));
       os = ss.getOutputStream();
       pw = new PrintWriter(os,true);
     }
     catch(Exception e)
     {System.out.println("Trouble with initial connection"+e);}
   try
   {
      //Create a new instance of our application's frame, and make it visible.
      (new NameClientSolution()).setVisible(true);
   }
catch (Throwable t)
{
   System.err.println(t);
   t.printStackTrace();
   //Ensure the application exits with an error condition.
   System.exit(1);
}
}

public void addNotify()
{
   // Record the size of the window prior to calling parents addNotify.
   Dimension d = getSize();
   super.addNotify();
   if (fComponentsAdjusted)
      return;
   // Adjust components according to the insets
   setSize(getInsets().left + getInsets().right + d.width,
        getInsets().top + getInsets().bottom + d.height);
   Component components[] = getComponents();
   for (int i = 0; i < components.length; i++)
   {
      Point p = components[i].getLocation();
      p.translate(getInsets().left, getInsets().top);
     components[i].setLocation(p);
   }
fComponentsAdjusted = true;
}

boolean fComponentsAdjusted = false;

java.awt.Button gobutton = new java.awt.Button();
java.awt.TextField nameField = new java.awt.TextField();
java.awt.TextField addressField = new java.awt.TextField();
java.awt.Label nameLabel = new java.awt.Label();
java.awt.Label addressLabel = new java.awt.Label();

class SymWindow extends java.awt.event.WindowAdapter
{
   public void windowClosing(java.awt.event.WindowEvent event)
   {
      Object object = event.getSource();
      if (object == NameClientSolution.this)
         Frame1_WindowClosing(event);
   }
}

void Frame1_WindowClosing(java.awt.event.WindowEvent event)
{
   Frame1_WindowClosing_Interaction1(event);
}


void Frame1_WindowClosing_Interaction1(java.awt.event.WindowEvent event)
{
   try {
      // QuitDialog Create and show as modal
      System.exit(0);
   } catch (Exception e) {
   }
}


class SymAction implements java.awt.event.ActionListener
{
public void actionPerformed(java.awt.event.ActionEvent event)
{
   Object object = event.getSource();
   if (object == gobutton)
      gobutton_ActionPerformed(event);
}
}

//****************************************************************************
//End of ignored section
//****************************************************************************


void gobutton_ActionPerformed(java.awt.event.ActionEvent event)
{
   try
   {
      // Extract the string from the name text field and send to server
      pw.println(nameField.getText());
      // Get reply from server
      String reply = bf.readLine();
      // Display reply
      addressField.setText(reply);
   }
   catch (Exception ex)
      {System.out.println("Problem communicating with name server"+ex);}
}

}