In Java

Write a graphical application describing an earthquake, as in Section 3.3. Supply a text field and button for entering the strength of the earthquake. Display the earthquake description in a label.*/

- Please see the code below. Add javadoc and code comments

- Please include screenshot of your program. I am not certain how many classes or packages to create. Appreciate if you could add instruction on which one to build. I use Eclipse.

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import java.awt.event.ActionEvent;

import java.awt.event.ActionListener;

import javax.swing.JButton;

import javax.swing.JFrame;

import javax.swing.JLabel;

import javax.swing.JOptionPane;

import javax.swing.JPanel;

import javax.swing.JTextField;

@SuppressWarnings("serial")

public class EarthquakeFrame extends JFrame {

private static final int FRAME_WIDTH = 600;

private static final int FRAME_HEIGHT = 100;

private JButton displayEarthquakeButton;

private JLabel earthquakeFieldLabel;

private JTextField earthquakeStrengthField;

private JLabel earthquakeDescriptionLabel;

private JPanel panel;

public EarthquakeFrame() {

this.createComponents();

this.createPanel();

this.setSize(FRAME_WIDTH, FRAME_HEIGHT);

this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

this.setVisible(true);

}

public void createPanel() {

this.panel = new JPanel();

this.panel.add(this.earthquakeFieldLabel);

this.panel.add(this.earthquakeStrengthField);

this.panel.add(this.displayEarthquakeButton);

this.panel.add(this.earthquakeDescriptionLabel);

this.add(panel);

}

public void createComponents() {

this.createLabels();

this.createTextField();

this.createButtons();

}

public void createLabels() {

this.earthquakeFieldLabel = new JLabel("Earthquake magnitute: ");

this.earthquakeDescriptionLabel = new JLabel("");

}

private void createTextField() {

final int FIELD_WIDTH = 5;

this.earthquakeStrengthField = new JTextField(FIELD_WIDTH);

this.earthquakeStrengthField.setText("");

}

private void createButtons() {

this.displayEarthquakeButton = new JButton("Display description");

this.displayEarthquakeButton.addActionListener(new ActionListener() {

@Override

public void actionPerformed(ActionEvent e) {

try {

double magnitude = Double.parseDouble(earthquakeStrengthField.getText());

String description = "";

if (magnitude <= 0) {

throw new IllegalArgumentException();

} else if (magnitude <= 2.5) {

description = "Usually not felt, but can be recorded by seismograph.";

} else if (magnitude <= 5.5) {

description = "Often felt, but only causes minor damage.";

} else if (magnitude <= 6.0) {

description = "Slight damage to buildings and other structures.";

} else if (magnitude <= 6.9) {

description = "May cause a lot of damage in very populated areas.";

} else if (magnitude <= 7.9) {

description = "Major earthquake. Serious damage.";

} else {

description = "Great earthquake. Can totally destroy communities near the epicenter.";

}

earthquakeDescriptionLabel.setText(description);

} catch (IllegalArgumentException exception) {

JOptionPane.showMessageDialog(null, "Magnitude must be a positive number!",

"Invalid magnitude level!", JOptionPane.ERROR_MESSAGE);

}

}

});

}

public static void main(String[] args) {

@SuppressWarnings("unused")

JFrame frame = new EarthquakeFrame();

}

}