//latest template  20 oct
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;

public class Sine extends JFrame implements ActionListener {

    private JButton button;
    private JTextField textField;

    public static void main(String[] args) {
        Sine frame = new Sine();
        frame.setSize(400,300);
        frame.createGUI();
        frame.show();
    }

    private void createGUI() {
        setDefaultCloseOperation(EXIT_ON_CLOSE);
        Container window = getContentPane();
        window.setLayout(new FlowLayout());

        textField = new JTextField(20);
        window.add(textField);

        button = new JButton("calculate sine");
        window.add(button);
        button.addActionListener(this);
    }

    public void actionPerformed(ActionEvent event) {
        textField.setText(Double.toString(sin(Math.PI/6.0)));
    }

    private double sin(double x) {
        double term, result;

        result = 0.0;
        term = x;
        for ( int n = 1; Math.abs(term) >= 0.0001; n = n + 2 ) { 
            result = result + term;
            term = - term * x * x / ((n + 1) * (n + 2));
        }
        return result;
    }

}