Source Code : CelsiusConverter: the use of JButton, JTextField and JLabel

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CelsiusConverter: the use of JButton, JTextField and JLabel

/* From http://java.sun.com/docs/books/tutorial/index.html */
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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();
  }
}

           
       

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