Hi Friend,

Try the following code:

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;

public class Compare extends JFrame implements ItemListener
{
JComboBox combo,lcombo;
JTextField number;

public Compare()
{
setLayout(null);
String a[]={"Select","First","Second"};

combo=new JComboBox(a);combo.setBounds(50,50,100,20);
combo.addItemListener(this);
add(combo);

lcombo=new JComboBox();
lcombo.addItemListener(this);lcombo.setEnabled(false);
add(lcombo);lcombo.setBounds(50,100,100,20);

number=new JTextField(5);number.setEditable(false);
add(number);number.setBounds(50,150,100,20);
setSize(300,300);
}

public void itemStateChanged(ItemEvent e) {
String b[]={"Select","One","Two"};
String c[]={"Select","Three","Four"};
if(e.getSource() == combo) {
if(combo.getSelectedItem().equals("Select"))
{
lcombo.setEnabled(false);
number.setEditable(false);
}
else if(combo.getSelectedItem().equals("First"))
{

lcombo.setEnabled(true);
number.setEditable(true);

for(int i=0;i<b.length;i++)
{
lcombo.removeItem(b[i]);
lcombo.removeItem(c[i]);

lcombo.addItem(b[i]);

}

}

else if(combo.getSelectedItem().equals("Second"))
{

lcombo.setEnabled(true);
number.setEditable(true);

for(int i=0;i<c.length;i++)
{
lcombo.removeItem(c[i]);
lcombo.removeItem(b[i]);

System.out.println(c[i]);
lcombo.addItem(c[i]);

}
}
}
else if(e.getSource() == lcombo) {
if(lcombo.getSelectedItem().equals("Select"))
{
number.setText("");number.setEditable(false);
}
else if(lcombo.getSelectedItem().equals("One"))
{
number.setText("1");number.setEditable(true);
}
else if(lcombo.getSelectedItem().equals("Two"))
{
number.setText("2");number.setEditable(true);
}
else if(lcombo.getSelectedItem().equals("Three"))
{


number.setText("3");number.setEditable(true);
}
else if(lcombo.getSelectedItem().equals("Four"))
{
number.setText("4");number.setEditable(true);
}
}
}
public static void main(String args[])
{
(new Compare()).setVisible(true);
}
}
Thanks