Three points on one straight line in language Java using Swing

Language

Java using Swing
Description

Given three points (x1, y1), (x2, y2), and (x3, y3), check if all the three points fall on one straight line.

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import java.awt.*;

import java.awt.event.*;

import javax.swing.*;

public class ThreePointsOnOneStraightLine extends JFrame implements ActionListener {

    private static final long serialVersionUID = 1L;

    private JTextField field_x1, field_x2, field_x3, field_y1, field_y2, field_y3;

    private JLabel label_slope1, label_slope2;

    private JButton button;

    public Algorithm() {

        field_x1 = new JTextField(4);

        field_x2 = new JTextField(4);

        field_x3 = new JTextField(4);

        field_y1 = new JTextField(4);

        field_y2 = new JTextField(4);

        field_y3 = new JTextField(4);

        label_slope1 = new JLabel("", JLabel.RIGHT);

        label_slope2 = new JLabel("", JLabel.RIGHT);

        button = new JButton("Process");

        Container pane = getContentPane();

        pane.setLayout(new BorderLayout());

        JPanel panel, subpanel;

        panel = new JPanel(new BorderLayout());

        subpanel = new JPanel(new GridLayout(6, 1));

        subpanel.add(new JLabel("Enter the value of x1:"));

        subpanel.add(new JLabel("Enter the value of x2:"));

        subpanel.add(new JLabel("Enter the value of x3:"));

        subpanel.add(new JLabel("Enter the value of y1:"));

        subpanel.add(new JLabel("Enter the value of y2:"));

        subpanel.add(new JLabel("Enter the value of y3:"));

        panel.add(subpanel, BorderLayout.WEST);

        subpanel = new JPanel(new GridLayout(6, 1));

        subpanel.add(field_x1);

        subpanel.add(field_x2);

        subpanel.add(field_x3);

        subpanel.add(field_y1);

        subpanel.add(field_y2);

        subpanel.add(field_y3);

        panel.add(subpanel);

        pane.add(panel, BorderLayout.NORTH);

        panel = new JPanel(new FlowLayout());

        panel.add(button);

        pane.add(panel);

        panel = new JPanel(new BorderLayout());

        subpanel = new JPanel(new GridLayout(2, 1));

        subpanel.add(new JLabel("Value of slope1:"));

        subpanel.add(new JLabel("Value of slope2:"));

        panel.add(subpanel, BorderLayout.WEST);

        subpanel = new JPanel(new GridLayout(2, 1));

        subpanel.add(label_slope1);

        subpanel.add(label_slope2);

        panel.add(subpanel);

        pane.add(panel, BorderLayout.SOUTH);

        button.addActionListener(this);

        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

        pack();

        setLocationRelativeTo(null);

    }

    @Override

    public void actionPerformed(ActionEvent actionEvent) {

        double slope1, slope2, x1, x2, x3;

        double y1, y2, y3;

        try {

            x1 = Double.parseDouble(field_x1.getText());

            x2 = Double.parseDouble(field_x2.getText());

            x3 = Double.parseDouble(field_x3.getText());

            y1 = Double.parseDouble(field_y1.getText());

            y2 = Double.parseDouble(field_y2.getText());

            y3 = Double.parseDouble(field_y3.getText());

        } catch (NumberFormatException numberFormatException) {

            return;

        }

        slope1=(y1-y2)/(x1-x2);

        slope2=(y2-y3)/(x2-x3);

        if(slope1==slope2&&y1-slope1*x1&&y3-slope2*x3)

            javax.swing.JOptionPane.showMessageDialog(this, "The three points fall on one straight line.");

        else

            javax.swing.JOptionPane.showMessageDialog(this, "The three points do not fall on one straight line.");

        label_slope1.setText(String.valueOf(slope1));

        label_slope2.setText(String.valueOf(slope2));

        pack();

    }

    public static void main(String[] args) {

        new Algorithm().setVisible(true);

    }

}