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

public class ButtonSalesTaxCalculator extends JApplet implements ActionListener
{
    private JTextArea output;
    private JLabel label;
    private JTextField input;
    private JButton button;  
        
	public void init() 
	{
       label = new JLabel("Sales Tax Calculator");
       button = new JButton("Calculate");
       input = new JTextField(10);
       output = new JTextArea(""); 

       Container container = getContentPane();
       
       GridLayout grid = new GridLayout(1, 4, 5, 5);	// 4 rows, 1 column, 5 pixels between cells horiz & vertically
       
       container.setLayout(grid);
       container.add(label);
       container.add(input);
       container.add(button);
       container.add(output);         
             
       button.addActionListener(this); 
	}
	
    public void actionPerformed(ActionEvent e)        
    {
       if (e.getSource() == button)
       {
            String userInput = input.getText();
            double userNum = Double.parseDouble(userInput);
            double withTax = userNum * 1.06;
            output.setText(new Double(withTax).toString());
       }
    }

}