CelsiusConverter.java Source code

Introduction

Here is the source code for CelsiusConverter.java

Source

/* From http://java.sun.com/docs/books/tutorial/index.html */
/*
 * Copyright (c) 2006 Sun Microsystems, Inc. All Rights Reserved.
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 * modification, are permitted provided that the following conditions are met:
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 *  list of conditions and the following disclaimer.
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 * -Redistribution in binary form must reproduce the above copyright notice,
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 *  and/or other materials provided with the distribution.
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 * Neither the name of Sun Microsystems, Inc. or the names of contributors may
 * be used to endorse or promote products derived from this software without
 * specific prior written permission.
 *
 * This software is provided "AS IS," without a warranty of any kind. ALL
 * EXPRESS OR IMPLIED CONDITIONS, REPRESENTATIONS AND WARRANTIES, INCLUDING
 * ANY IMPLIED WARRANTY OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE
 * OR NON-INFRINGEMENT, ARE HEREBY EXCLUDED. SUN MIDROSYSTEMS, INC. ("SUN")
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// v 1.3

import java.awt.BorderLayout;
import java.awt.GridLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

import javax.swing.BorderFactory;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JTextField;
import javax.swing.SwingConstants;
import javax.swing.UIManager;

// This example demonstrates the use of JButton, JTextField and JLabel.
public class CelsiusConverter implements ActionListener {
    JFrame converterFrame;

    JPanel converterPanel;

    JTextField tempCelsius;

    JLabel celsiusLabel, fahrenheitLabel;

    JButton convertTemp;

    // Constructor
    public CelsiusConverter() {
        // Create the frame and container.
        converterFrame = new JFrame("Convert Celsius to Fahrenheit");
        converterPanel = new JPanel();
        converterPanel.setLayout(new GridLayout(2, 2));

        // Add the widgets.
        addWidgets();

        // Add the panel to the frame.
        converterFrame.getContentPane().add(converterPanel, BorderLayout.CENTER);

        // Exit when the window is closed.
        converterFrame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

        // Show the converter.
        converterFrame.pack();
        converterFrame.setVisible(true);
    }

    // Create and add the widgets for converter.
    private void addWidgets() {
        // Create widgets.
        tempCelsius = new JTextField(2);
        celsiusLabel = new JLabel("Celsius", SwingConstants.LEFT);
        convertTemp = new JButton("Convert...");
        fahrenheitLabel = new JLabel("Fahrenheit", SwingConstants.LEFT);

        // Listen to events from Convert button.
        convertTemp.addActionListener(this);

        // Add widgets to container.
        converterPanel.add(tempCelsius);
        converterPanel.add(celsiusLabel);
        converterPanel.add(convertTemp);
        converterPanel.add(fahrenheitLabel);

        celsiusLabel.setBorder(BorderFactory.createEmptyBorder(5, 5, 5, 5));
        fahrenheitLabel.setBorder(BorderFactory.createEmptyBorder(5, 5, 5, 5));

    }

    // Implementation of ActionListener interface.
    public void actionPerformed(ActionEvent event) {
        // Parse degrees Celsius as a double and convert to Fahrenheit.
        int tempFahr = (int) ((Double.parseDouble(tempCelsius.getText())) * 1.8 + 32);
        fahrenheitLabel.setText(tempFahr + " Fahrenheit");
    }

    // main method
    public static void main(String[] args) {
        // Set the look and feel.
        try {
            UIManager.setLookAndFeel(UIManager.getCrossPlatformLookAndFeelClassName());
        } catch (Exception e) {
        }

        CelsiusConverter converter = new CelsiusConverter();
    }
}