Volume of a sphere in language Java using Applet

Language

Java using Applet
Description

Calculates the volume of a sphere having its radius

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import java.applet.Applet;

import java.awt.*;

import java.awt.event.*;

public class VolumeOfASphere extends Applet implements ActionListener {

    private static final long serialVersionUID = 1L;

    private TextField field_radius;

    private Label label_volume;

    private Button button;

    @Override

    public void init() {

        field_radius = new TextField(4);

        label_volume = new Label();

        button = new Button("Process");

        setLayout(new BorderLayout());

        Panel panel, subpanel;

        panel = new Panel(new BorderLayout());

        subpanel = new Panel(new GridLayout(1, 1));

        subpanel.add(new Label("Enter the value of radius:"));

        panel.add(subpanel, BorderLayout.WEST);

        subpanel = new Panel(new GridLayout(1, 1));

        subpanel.add(field_radius);

        panel.add(subpanel);

        add(panel, BorderLayout.NORTH);

        panel = new Panel(new FlowLayout());

        panel.add(button);

        add(panel);

        panel = new Panel(new BorderLayout());

        subpanel = new Panel(new GridLayout(1, 1));

        subpanel.add(new Label("Value of volume:"));

        panel.add(subpanel, BorderLayout.WEST);

        subpanel = new Panel(new GridLayout(1, 1));

        subpanel.add(label_volume);

        panel.add(subpanel);

        add(panel, BorderLayout.SOUTH);

        button.addActionListener(this);

    }

    @Override

    public void actionPerformed(ActionEvent actionEvent) {

        double radius, volume;

        try {

            radius = Double.parseDouble(field_radius.getText());

        } catch (NumberFormatException numberFormatException) {

            return;

        }

        volume=4.0*Math.PI*radius*radius*radius/3.0;

        label_volume.setText(String.valueOf(volume));

    }

}