Hi Friend,

You can use following code:

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

public class PayRoll extends JFrame
{

final double withHolding = .15 ;
JButton Calculate;
JPanel panel;
JLabel label1,label2;
final JTextField text1,text2;
public PayRoll(){
label1 = new JLabel();
label1.setText("Enter the no. of working hours:");
text1 = new JTextField(20);
label2 = new JLabel();
label2.setText("Enter wage per hour:");
text2 = new JTextField(20);
Calculate=new JButton("Calculate");

panel=new JPanel(new GridLayout(3,2));
panel.add(label1);
panel.add(text1);
panel.add(label2);
panel.add(text2);
panel.add(Calculate);
add(panel,BorderLayout.CENTER);
setTitle("FORM");

Calculate.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent ae){
String value1=text1.getText();
String value2=text2.getText();
try{
double hoursWorked=Double.parseDouble(value1);
double wagePerHour=Double.parseDouble(value2);
double grossPay = wagePerHour * hoursWorked;
double tax = grossPay * withHolding;
double netPay=grossPay-tax;

JOptionPane.showMessageDialog(null, "Gross Pay is: "+grossPay);
JOptionPane.showMessageDialog(null, "Withholding tax of 15% on GP is: "+tax);
JOptionPane.showMessageDialog(null, "Net Pay is: "+netPay);
}
catch(Exception e){

JOptionPane.showMessageDialog(null, "Enter numeric value");
}
}
});
}
public static void main(String[] args)
{
PayRoll frame=new PayRoll();
frame.setVisible(true);
frame.pack();
}
}
Thanks