import javax.swing.*;

import java.awt.*;

import java.awt.event.*;

​

public class VelocityTimeGUI extends JFrame {

    private JTextField initialVelocityField;

    private JTextField accelerationField;

    private JTextField timeField;

    private JTextField finalVelocityField;

    public VelocityTimeGUI() {

        setTitle("Velocity-Time Calculator");

        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

        setLayout(new GridLayout(5, 2));

        add(new JLabel("Initial Velocity (u):"));

        initialVelocityField = new JTextField();

        add(initialVelocityField);

        add(new JLabel("Acceleration (a):"));

        accelerationField = new JTextField();

        add(accelerationField);

        add(new JLabel("Time (t):"));

        timeField = new JTextField();

        add(timeField);

        add(new JLabel("Final Velocity (v):"));

        finalVelocityField = new JTextField();

        finalVelocityField.setEditable(false); // Output field, so not editable

        add(finalVelocityField);

        JButton calculateButton = new JButton("Calculate");

        calculateButton.addActionListener(new ActionListener() {

            public void actionPerformed(ActionEvent e) {

                calculateFinalVelocity();

            }

        });

        add(calculateButton);

        JButton stopButton = new JButton("Stop");

        stopButton.addActionListener(new ActionListener() {

            public void actionPerformed(ActionEvent e) {

                System.exit(0);

            }

        });

        add(stopButton);

        pack();

        setVisible(true);

    }

    private void calculateFinalVelocity() {

        try {

            double u = Double.parseDouble(initialVelocityField.getText());

            double a = Double.parseDouble(accelerationField.getText());

            double t = Double.parseDouble(timeField.getText());

            double v = u + a * t;

            finalVelocityField.setText(Double.toString(v));

        } catch (NumberFormatException ex) {

            JOptionPane.showMessageDialog(this, "Invalid input! Please enter numbers.");

        }

    }

    public static void main(String[] args) {

        SwingUtilities.invokeLater(new Runnable() {

            public void run() {

                new VelocityTimeGUI();

            }

        });

    }

}