I am create one program that contain two combo boxes. If first combo box i am display all date. If i select one date from first combo box then the second combo box display some dates based on first combo box select date. Here is my full program

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import java.sql.*;
import java.text.*;
import javax.swing.table.*;
class DateView extends JFrame implements ActionListener,ItemListener
{
	Container c;
	JLabel lblstart,lblend;
	JComboBox cmbstart,cmbend;	
	JButton btnview,btnclose,btnclear;
	//JTextField txtpin;
	PreparedStatement pst,pst1;
	Connection con,con1;
	//Statement st,st1,st2;
	ResultSet rs,rs1;
	ViewEntry f1;
	String s,s1,end;
	String[] temp,temp1;	
	int d1,d2,m1,m2,y1,y2;
	DateView(ViewEntry f1)
	{
		c=getContentPane();
		c.setLayout(null);
		setTitle("Sort by Date");
		setBounds(325,325,400,200);
		setResizable(true);	
		Image img = Toolkit.getDefaultToolkit().getImage("logo.jpg");
                          setIconImage(img);
		lblstart=new JLabel("Start Date");
		lblend=new JLabel("End Date");
		cmbstart=new JComboBox();
		cmbend=new JComboBox();
		btnview=new JButton("View");
		btnclose=new JButton("Close");
		btnclear=new JButton("Clear");
		lblstart.setBounds(100,30,100,20);
		cmbstart.setBounds(200,30,120,20);
		lblend.setBounds(100,60,100,20);
		cmbend.setBounds(200,60,120,20);
		
		btnview.setBounds(70,100,80,20);
		btnclear.setBounds(170,100,80,20);
		btnclose.setBounds(270,100,80,20);

		c.add(lblstart);
		c.add(lblend);
		c.add(cmbstart);
		c.add(cmbend);
		c.add(btnview);
		c.add(btnclose);
		c.add(btnclear);
		
				
		btnview.addActionListener(this);
		btnclose.addActionListener(this);
		btnclear.addActionListener(this);

		this.f1=f1;
		f1.setEnabled(false);
		cmbstart.addItem("Select");
		cmbend.addItem("Select");

		addWindowListener(new WindowAdapter()
		{
			public void windowClosing(WindowEvent we)
			{
				close();
			}
		});
		try
		{
			Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");
			con=DriverManager.getConnection("jdbc:odbc:pushpa","","");
			pst=con.prepareStatement("select DISTINCT acc_date from account where pin_number like ?",ResultSet.TYPE_SCROLL_SENSITIVE,ResultSet.CONCUR_UPDATABLE);
			pst.setString(1,f1.txtstartdate.getText()+"%");
			rs=pst.executeQuery();
			while(rs.next())
			{
				//System.out.println(rs.getString(1));
				cmbstart.addItem(""+rs.getString(1));
			}
		}
		catch(Exception e)
		{
                   		
		}
		cmbstart.addItemListener(this);
		cmbend.addItemListener(this);
	}

	public void itemStateChanged(ItemEvent ie)
	{
		end=cmbstart.getSelectedItem().toString();
		temp = end.split("-");
		d1=Integer.parseInt(temp[0].trim());
		m1=Integer.parseInt(temp[1].trim());
		y1=Integer.parseInt(temp[2].trim());
		//System.out.println(d1);
		try
		{
			Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");
			con1=DriverManager.getConnection("jdbc:odbc:pushpa","","");
			pst1=con1.prepareStatement("select distinct acc_date from account where pin_number like ?");
			pst1.setString(1,f1.txtstartdate.getText()+"%");
			rs1=pst1.executeQuery();
			while(rs1.next())
			{
				s=s1=rs1.getString(1);
				System.out.println(s);
				temp1=s.split("-");
				d2=Integer.parseInt(temp1[0].trim());
				m2=Integer.parseInt(temp1[1].trim());
				y2=Integer.parseInt(temp1[2].trim());
				System.out.println(d2);
				if((d1<=d2)&&(m1<=m2)&&(y1<=y2))
				{
					System.out.println(s1);
					cmbend.addItem(s1);
				}
			}
		}
		catch(Exception e)
		{
                   		System.out.println(e.toString());
		}
		
	}


	public void actionPerformed(ActionEvent ae)
	{
		
	}
	public void close()
	{
		f1.setEnabled(true);
		f1.toFront();
		setVisible(false);
		dispose();
	}
	
}

The above program run correctly. but the second combo box display date at two times.
That means
1-1-2010
2-1-2010
3-1-2010
4-1-2010
1-1-2010
2-1-2010
3-1-2010
4-1-2010

But i want only one time like this
1-1-2010
2-1-2010
3-1-2010
4-1-2010

Please help me

Try to empty the second combo box before adding any more dates from the first combo.

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