Hi Friend,

Try the following code:

import javax.swing.*;
import java.awt.*;
import java.text.*;
import java.awt.event.*;
import java.util.*;
import java.sql.*;

class SalesTax extends JFrame {
double tax=0.10;
JLabel l1,l2,l3,l4,l5,l6,l7,l8,l9,l10,l11;
JTextField text;
JButton b1,b2,b3;
JPanel panel;
JTextArea area;
JScrollPane pane;
public SalesTax(){
panel=new JPanel(new GridLayout(8,2));
text=new JTextField(20);
l1=new JLabel("Enter Item Code:");
l2=new JLabel("Item Name: ");
l3=new JLabel();
l4=new JLabel("Item Price: ");
l5=new JLabel();
l6=new JLabel("Item Code: ");
l7=new JLabel();
l8=new JLabel("Tax: ");
l9=new JLabel();
l10=new JLabel("Total Price: ");
l11=new JLabel();
b1=new JButton("Submit");
b2=new JButton("Total");
b3=new JButton("Display All Items On Console");
b1.addActionListener(new ActionListener(){
public void actionPerformed(ActionEvent e){
int co=Integer.parseInt(text.getText());
try {
Class.forName("com.mysql.jdbc.Driver").newInstance();
Connection con = DriverManager.getConnection("jdbc:mysql://localhost:3306/register";, "root", "root");
Statement stmt = con.createStatement();
ResultSet rs = stmt.executeQuery("select * from item where Item_Code='"+co+"'");
String name="";
double p=0.0;
while (rs.next())
{
name=rs.getString("Item_Name");
p=rs.getDouble("Item_Price");
}
l3.setText(name);
l5.setText(Double.toString(p));
l7.setText(text.getText());
}
catch(Exception ex){}
l2.setVisible(true);
l3.setVisible(true);
l4.setVisible(true);
l5.setVisible(true);
l6.setVisible(true);
l7.setVisible(true);
b2.setVisible(true);
l1.setVisible(false);
text.setVisible(false);
b1.setVisible(false);
b3.setVisible(false);
}
});

continue....

b2.addActionListener(new ActionListener(){
public void actionPerformed(ActionEvent e){
String st=l5.getText();
double pr=Double.parseDouble(st);
//imposing tax of 10% on each item
double taxprice=pr*tax;
double tprice=pr+taxprice;
l9.setText(Double.toString(taxprice));
l11.setText(Double.toString(tprice));

l2.setVisible(true);
l3.setVisible(true);
l4.setVisible(true);
l5.setVisible(true);
l6.setVisible(true);
l7.setVisible(true);
l8.setVisible(true);
l9.setVisible(true);
l10.setVisible(true);
l11.setVisible(true);
b3.setVisible(true);
b2.setVisible(false);
l1.setVisible(false);
text.setVisible(false);
b1.setVisible(false);
}
});
b3.addActionListener(new ActionListener(){
public void actionPerformed(ActionEvent e){
try {
Class.forName("com.mysql.jdbc.Driver").newInstance();
Connection con = DriverManager.getConnection("jdbc:mysql://localhost:3306/register";, "root", "root");
Statement stmt = con.createStatement();
ResultSet rs = stmt.executeQuery("select * from item");
String strVal="";
ResultSetMetaData md=rs.getMetaData();
int col= md.getColumnCount();
for (int i=0; i<col; i++) {
System.out.print(md.getColumnName(i+1)+" ");
}
System.out.println();
while(rs.next()){
for (int i=0; i<col; i++){
System.out.print(rs.getString(i+1)+" ");
}
System.out.println();
}
}
catch(Exception ex){}
}
});
l2.setVisible(false);
l3.setVisible(false);
l4.setVisible(false);
l5.setVisible(false);
l6.setVisible(false);
l7.setVisible(false);
b2.setVisible(false);
b3.setVisible(false);
l8.setVisible(false);
l9.setVisible(false);
l10.setVisible(false);
l11.setVisible(false);

panel.add(l6);
panel.add(l7);
panel.add(l2);
panel.add(l3);
panel.add(l4);
panel.add(l5);
panel.add(l8);
panel.add(l9);
panel.add(l10);
panel.add(l11);
panel.add(l1);
panel.add(text);
panel.add(b1);
panel.add(b2);
panel.add(b3);
add(panel);
setVisible(true);
pack();
}
}
public class PosGUI{
public static void main(String []args){
SalesTax tax=new SalesTax();
}
}

Hope that the above code will be helpful for you.
Thanks

Hi Friend,

Create table 'item' in the database:

CREATE TABLE `item` (
`Item_Code` bigint(20) default NULL,
`Item_Name` varchar(40) default NULL,
`Item_Price` double default NULL
)

Thanks