Dynamic Binding error/problem

Question

I am trying to write a program that reads content of
a textfield.The content will be an integer.
Depending on the value,an appropriate command is executed.
I've done using switch statement but i was told to more efficient
that will work on up to 100 commands.
I tried using interface but keep getting errors.
error1::cannot access directory javax\activation at line8
error2::variable commandMap not found in class testing4.testhandler at line 165.
Any idea why?Alternative suggestion is welcome.
Here is the code
//package DAYOSPACKAGE.test1;
import javax.swing.*;
import javax.swing.event.*;
import java.awt.*;
import java.awt.event.*;
import java.io.*;
import java.util.*;
import javax.activation.*;
//import java.lang.Object;
public class testing4 extends JFrame
{ private JTextField T1[],Tt;
  private JButton B1,B2;
  private JLabel L1[],L2;
  private JPanel P1,P2,P3;
  private FileInputStream in; // declare a file output object
  private FileOutputStream textfield;
  BufferedReader reading;
     private PrintStream p; // declare a print stream object
  private StreamTokenizer inputStream;
  private String Number1,Number2;
  private int num1,num2,num3,Limit,tf;
  private String InstructionSet[];
   public testing4()
  { String InstructionSet[]={"load"};
    T1=new JTextField[4];
    testbhandler tt1=new testbhandler();
    for(tf=0;tf<T1.length;tf++)
    { T1[tf]=new JTextField();
      T1[tf].getDocument().addDocumentListener(new MyDocumentListener());
    L1=new JLabel[4];
    for(int i=0;i<L1.length;i++)
    { L1=new JLabel(" "+i);
P1=new JPanel();
P1.setLayout(new GridLayout(4,2));
for(int i=0;i<4;i++)
{ P1.add(L1[i]);
P1.add(T1[i]);
B1=new JButton("START");
B1.setEnabled(false);
testahandler tb1=new testahandler();
B1.addActionListener(tb1);
L2=new JLabel();
//L2.addActionListener();
B2=new JButton("HELP");
P2=new JPanel();
P2.setLayout(new GridLayout(1,2));
P2.add(B1);
P2.add(B2);
P2.add(L2);
P3=new JPanel();
P3.setLayout(new BorderLayout());
P3.add(P1,BorderLayout.CENTER);
P3.add(P2,BorderLayout.SOUTH);
JFrame frame = new JFrame("LPC");
frame.addWindowListener(new WindowAdapter()
public void windowClosing(WindowEvent e)
System.exit(0);
frame.getContentPane().add(P3);
frame.pack();
frame.setSize(200,200);
frame.setVisible(true);
/*public void THRASH(int op)
{ switch(op)
{ case 1:
Number1=null;
while(Number1==null){
try
{ Number1=JOptionPane.showInputDialog( "Enter 1st Number" );
num1 = Integer.parseInt( Number1 );
catch ( NumberFormatException nfe )
JOptionPane.showMessageDialog( this,
"You must enter an integer",
"Invalid Number Format",
JOptionPane.ERROR_MESSAGE );
Number1 = null;
//Number1=JOptionPane.showInputDialog( "Enter 1st Number" );
break;
case 2:
Number2=null;
while(Number2==null){
try
{ Number2=JOptionPane.showInputDialog( "Enter 2nd Number" );
num2 = Integer.parseInt( Number2 );
catch ( NumberFormatException nfe )
JOptionPane.showMessageDialog( this,
"You must enter an integer",
"Invalid Number Format",
JOptionPane.ERROR_MESSAGE );
Number2 = null;
//Number1=JOptionPane.showInputDialog( "Enter 1st Number" );
break;
case 3:
num3=num2+num1;
break;
case 4:
JOptionPane.showMessageDialog(
null, "The sum is " + num3, "ANSWER",
JOptionPane.PLAIN_MESSAGE );
break;
default:
JOptionPane.showMessageDialog(
null, "Illegal Action" + num3, "ERROR",
JOptionPane.ERROR_MESSAGE);
/*private void jTextFieldKeyReleased(java.awt.event.KeyEvent evt)
{ if (evt.isActionKey()) return;
if (T1[tf].getText().trim().length()>0)
B1.setEnabled(true);
else
B1.setEnabled(false);
class MyDocumentListener implements DocumentListener
{ public void insertUpdate(DocumentEvent e)
{ B1.setEnabled(true);
public void removeUpdate(DocumentEvent e)
{ B1.setEnabled(false);
public void changedUpdate(DocumentEvent e)
//Plain text components don't fire these events.
private class testahandler implements ActionListener
{ public void actionPerformed(ActionEvent event)
{ for(int i=0;i<4;i++)
{ if(T1[i].getText().equals(""))
{ JOptionPane.showMessageDialog(
null, "Empty Box" , "ERROR",
JOptionPane.ERROR_MESSAGE);
return;
else
{ int OPC=(int)(Integer.parseInt(T1[i].getText()));
//THRASH(OPC);
Command c=(Command)commandMap.get(InstructionSet[OPC]);
c.execute();
//InstructionSet[OPC].execute();
private class testbhandler implements ActionListener
{ public void actionPerformed(ActionEvent event)
{ B1.setEnabled(false);
public static void main (String [] args)
{ testing4 done =new testing4();
public interface Command
{ public void execute();
public class load implements Command
{ //Tt.setBackground(Color.red);
//B2.sett
//T1[1].setBackground(Color.red);
public void execute()
{//B1.setEnabled(false);
T1[1].setText("HELLO");

Answer 1

I am trying to write a program that reads content of
a textfield.The content will be an integer.
Depending on the value,an appropriate command is
executed.
I've done using switch statement but i was told to
more efficient
that will work on up to 100 commands.
I tried using interface but keep getting errors.
error1::cannot access directory javax\activation at
line8
error2::variable commandMap not found in class
testing4.testhandler at line 165.
Any idea why?Alternative suggestion is welcome.
Here is the code
//package DAYOSPACKAGE.test1;
import javax.swing.*;
import javax.swing.event.*;
import java.awt.*;
import java.awt.event.*;
import java.io.*;
import java.util.*;
//import javax.activation.*;
//import java.lang.Object;
public class testing4 extends JFrame
{ private JTextField T1[],Tt;
private JButton B1,B2;
private JLabel L1[],L2;
private JPanel P1,P2,P3;
private FileInputStream in; // declare a file output
t object
private FileOutputStream textfield;
BufferedReader reading;
private PrintStream p; // declare a print stream
object
private StreamTokenizer inputStream;
private String Number1,Number2;
private int num1,num2,num3,Limit,tf;
private String InstructionSet[];
public testing4()
{ String InstructionSet[]={"load"};
T1=new JTextField[4];
testbhandler tt1=new testbhandler();
for(tf=0;tf<T1.length;tf++)
{ T1[tf]=new JTextField();
T1[tf].getDocument().addDocumentListener(new
r(new MyDocumentListener());
L1=new JLabel[4];
for(int i=0;i<L1.length;i++)
{ L1=new JLabel(" "+i);
P1=new JPanel();
P1.setLayout(new GridLayout(4,2));
for(int i=0;i<4;i++)
{ P1.add(L1[i]);
P1.add(T1[i]);
B1=new JButton("START");
B1.setEnabled(false);
testahandler tb1=new testahandler();
B1.addActionListener(tb1);
L2=new JLabel();
//L2.addActionListener();
B2=new JButton("HELP");
P2=new JPanel();
P2.setLayout(new GridLayout(1,2));
P2.add(B1);
P2.add(B2);
P2.add(L2);
P3=new JPanel();
P3.setLayout(new BorderLayout());
P3.add(P1,BorderLayout.CENTER);
P3.add(P2,BorderLayout.SOUTH);
JFrame frame = new JFrame("LPC");
frame.addWindowListener(new WindowAdapter()
public void
public void windowClosing(WindowEvent
sing(WindowEvent e)
System.exit(0);
frame.getContentPane().add(P3);
frame.pack();
frame.setSize(200,200);
frame.setVisible(true);
/*public void THRASH(int op)
{ switch(op)
{ case 1:
Number1=null;
while(Number1==null){
try
{ Number1=JOptionPane.showInputDialog( "Enter
Enter 1st Number" );
num1 = Integer.parseInt( Number1 );
catch ( NumberFormatException nfe )
JOptionPane.showMessageDialog( this,
"You must enter an integer",
"Invalid Number Format",
JOptionPane.ERROR_MESSAGE );
Number1 = null;
//Number1=JOptionPane.showInputDialog( "Enter
( "Enter 1st Number" );
break;
case 2:
Number2=null;
while(Number2==null){
try
{ Number2=JOptionPane.showInputDialog( "Enter
Enter 2nd Number" );
num2 = Integer.parseInt( Number2 );
catch ( NumberFormatException nfe )
JOptionPane.showMessageDialog( this,
"You must enter an integer",
"Invalid Number Format",
JOptionPane.ERROR_MESSAGE );
Number2 = null;
//Number1=JOptionPane.showInputDialog( "Enter
( "Enter 1st Number" );
break;
case 3:
num3=num2+num1;
break;
case 4:
JOptionPane.showMessageDialog(
null, "The sum is " + num3, "ANSWER",
JOptionPane.PLAIN_MESSAGE );
break;
default:
JOptionPane.showMessageDialog(
null, "Illegal Action" + num3, "ERROR",
JOptionPane.ERROR_MESSAGE);
/*private void
id jTextFieldKeyReleased(java.awt.event.KeyEvent evt)
{ if (evt.isActionKey()) return;
if (T1[tf].getText().trim().length()>0)
B1.setEnabled(true);
else
B1.setEnabled(false);
class MyDocumentListener implements
ts DocumentListener
{ public void insertUpdate(DocumentEvent e)
{ B1.setEnabled(true);
public void removeUpdate(DocumentEvent e)
{ B1.setEnabled(false);
public void changedUpdate(DocumentEvent e)
//Plain text components don't fire these
fire these events.
private class testahandler implements
ts ActionListener
{ public void actionPerformed(ActionEvent event)
{ for(int i=0;i<4;i++)
{ if(T1[i].getText().equals(""))
{ JOptionPane.showMessageDialog(
null, "Empty Box" , "ERROR",
JOptionPane.ERROR_MESSAGE);
return;
else
{ int
{ int OPC=(int)(Integer.parseInt(T1[i].getText()));
//THRASH(OPC);
Command
Command
d c=(Command)commandMap.get(InstructionSet[OPC]);
c.execute();
//InstructionSet[OPC].execute();
private class testbhandler implements
s ActionListener
{ public void actionPerformed(ActionEvent event)
{ B1.setEnabled(false);
public static void main (String [] args)
{ testing4 done =new testing4();
public interface Command
{ public void execute();
public class load implements Command
{ //Tt.setBackground(Color.red);
//B2.sett
//T1[1].setBackground(Color.red);
public void execute()
{//B1.setEnabled(false);
T1[1].setText("HELLO");