📄 celsiusconverter2.java
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//v 1.3import java.awt.*;import java.awt.event.*;import javax.swing.*;// This example demonstrates the use of JButton, JTextField// and JLabel.public class CelsiusConverter2 implements ActionListener { JFrame converterFrame; JPanel converterPanel; JTextField tempCelsius; JLabel celsiusLabel, fahrenheitLabel; JButton convertTemp; // Constructor public CelsiusConverter2() { // 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. ImageIcon icon = new ImageIcon("images/convert.gif", "Convert temperature"); tempCelsius = new JTextField(2); celsiusLabel = new JLabel("Celsius", SwingConstants.LEFT); convertTemp = new JButton(icon); fahrenheitLabel = new JLabel("Fahrenheit", SwingConstants.LEFT); celsiusLabel.setBorder(BorderFactory.createEmptyBorder(5,5,5,5)); fahrenheitLabel.setBorder(BorderFactory.createEmptyBorder(5,5,5,5)); // 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); } // 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); // Set fahrenheitLabel to new value and set font color based on the temperature. if (tempFahr <= 32) { fahrenheitLabel.setText("<html><Font Color=blue>" + tempFahr + "° </Font><Font Color=black> Fahrenheit</font></html>"); } else if (tempFahr <= 80) { fahrenheitLabel.setText("<html><Font Color=green>" + tempFahr + "° </Font><Font Color=black> Fahrenheit </Font></html>"); } else { fahrenheitLabel.setText("<html><Font Color=red>" + tempFahr + "° </Font><Font Color=black> Fahrenheit</Font></html>"); } } // main method public static void main(String[] args) { // set the look and feel try { UIManager.setLookAndFeel( UIManager.getCrossPlatformLookAndFeelClassName()); } catch(Exception e) {} CelsiusConverter2 converter = new CelsiusConverter2(); }}⌨️ 快捷键说明
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