Area and the perimeter of a rectangle in language Java using Swing

Language

Java using Swing
Description

It calculates tha area and the perimeter of a rectangle getting the height and the width.

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import java.awt.*;

import java.awt.event.*;

import javax.swing.*;

public class AreaAndThePerimeterOfARectangle extends JFrame implements ActionListener {

    private static final long serialVersionUID = 1L;

    private JTextField field_height, field_width;

    private JLabel label_area, label_perimeter;

    private JButton button;

    public Algorithm() {

        field_height = new JTextField(4);

        field_width = new JTextField(4);

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

        label_perimeter = 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(2, 1));

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

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

        panel.add(subpanel, BorderLayout.WEST);

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

        subpanel.add(field_height);

        subpanel.add(field_width);

        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 area:"));

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

        panel.add(subpanel, BorderLayout.WEST);

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

        subpanel.add(label_area);

        subpanel.add(label_perimeter);

        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 area, height, perimeter, width;

        try {

            height = Double.parseDouble(field_height.getText());

            width = Double.parseDouble(field_width.getText());

        } catch (NumberFormatException numberFormatException) {

            return;

        }

        area=height*width;

        perimeter=height*2+width*2;

        label_area.setText(String.valueOf(area));

        label_perimeter.setText(String.valueOf(perimeter));

        pack();

    }

    public static void main(String[] args) {

        new Algorithm().setVisible(true);

    }

}