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  1. import javax.swing.*;
  2. import java.awt.event.*;
  3.  
  4. class CurrencyConverterGUI extends JFrame {
  5.     private JComboBox<String> currencyComboBox;
  6.     private JTextField inputTextField, resultTextField;
  7.     private JButton convertButton, clearButton;
  8.  
  9.     // Exchange rates
  10.     private static final double EXCHANGE_RATE_CAN = 97.50;
  11.     private static final double EXCHANGE_RATE_US = 129.02;
  12.     private static final double EXCHANGE_RATE_EURO = 164.33;
  13.  
  14.     public CurrencyConverterGUI() {
  15.         setTitle("Currency Converter");
  16.         setSize(300, 200);
  17.         setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
  18.         setLocationRelativeTo(null);
  19.  
  20.         JLabel label1 = new JLabel("Currency Type:");
  21.         JLabel label2 = new JLabel("Input $:");
  22.         JLabel label3 = new JLabel("JMD Amount $:");
  23.  
  24.         currencyComboBox = new JComboBox<>(new String[]{"US", "CAN", "Euro"});
  25.         inputTextField = new JTextField(10);
  26.         resultTextField = new JTextField(10);
  27.         resultTextField.setEditable(false);
  28.  
  29.         convertButton = new JButton("Convert");
  30.         clearButton = new JButton("Clear");
  31.  
  32.         JPanel panel = new JPanel();
  33.         panel.add(label1);
  34.         panel.add(currencyComboBox);
  35.         panel.add(label2);
  36.         panel.add(inputTextField);
  37.         panel.add(label3);
  38.         panel.add(resultTextField);
  39.         panel.add(convertButton);
  40.         panel.add(clearButton);
  41.  
  42.         add(panel);
  43.  
  44.         convertButton.addActionListener(new ActionListener() {
  45.             public void actionPerformed(ActionEvent e) {
  46.                 convertCurrency();
  47.             }
  48.         });
  49.  
  50.         clearButton.addActionListener(new ActionListener() {
  51.             public void actionPerformed(ActionEvent e) {
  52.                 clearFields();
  53.             }
  54.         });
  55.     }
  56.  
  57.     private void convertCurrency() {
  58.         String currency = (String) currencyComboBox.getSelectedItem();
  59.         String input = inputTextField.getText();
  60.  
  61.         if (input.isEmpty()) {
  62.             JOptionPane.showMessageDialog(this, "Please enter a valid amount.", "Error", JOptionPane.ERROR_MESSAGE);
  63.             return;
  64.         }
  65.  
  66.         try {
  67.             double amount = Double.parseDouble(input);
  68.             double convertedAmount = 0.0;
  69.  
  70.             switch (currency) {
  71.                 case "US":
  72.                     convertedAmount = amount * EXCHANGE_RATE_US;
  73.                     break;
  74.                 case "CAN":
  75.                     convertedAmount = amount * EXCHANGE_RATE_CAN;
  76.                     break;
  77.                 case "Euro":
  78.                     convertedAmount = amount * EXCHANGE_RATE_EURO;
  79.                     break;
  80.             }
  81.  
  82.             resultTextField.setText(String.format("%.2f", convertedAmount));
  83.         } catch (NumberFormatException ex) {
  84.             JOptionPane.showMessageDialog(this, "Please enter a valid number.", "Error", JOptionPane.ERROR_MESSAGE);
  85.         }
  86.     }
  87.  
  88.     private void clearFields() {
  89.         inputTextField.setText("");
  90.         resultTextField.setText("");
  91.         currencyComboBox.setSelectedIndex(0);
  92.     }
  93.  
  94.     public static void main(String[] args) {
  95.         SwingUtilities.invokeLater(new Runnable() {
  96.             public void run() {
  97.                 new CurrencyConverterGUI().setVisible(true);
  98.             }
  99.         });
  100.     }
  101. }
Success #stdin #stdout #stderr 0.28s 67292KB
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Exception in thread "AWT-EventQueue-0" java.awt.HeadlessException: 
No X11 DISPLAY variable was set, but this program performed an operation which requires it.
	at java.desktop/java.awt.GraphicsEnvironment.checkHeadless(GraphicsEnvironment.java:197)
	at java.desktop/java.awt.Window.<init>(Window.java:538)
	at java.desktop/java.awt.Frame.<init>(Frame.java:423)
	at java.desktop/java.awt.Frame.<init>(Frame.java:388)
	at java.desktop/javax.swing.JFrame.<init>(JFrame.java:180)
	at CurrencyConverterGUI.<init>(Main.java:14)
	at CurrencyConverterGUI$3.run(Main.java:97)
	at java.desktop/java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:313)
	at java.desktop/java.awt.EventQueue.dispatchEventImpl(EventQueue.java:770)
	at java.desktop/java.awt.EventQueue$4.run(EventQueue.java:721)
	at java.desktop/java.awt.EventQueue$4.run(EventQueue.java:715)
	at java.base/java.security.AccessController.doPrivileged(AccessController.java:389)
	at java.base/java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:85)
	at java.desktop/java.awt.EventQueue.dispatchEvent(EventQueue.java:740)
	at java.desktop/java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:203)
	at java.desktop/java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:124)
	at java.desktop/java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:113)
	at java.desktop/java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:109)
	at java.desktop/java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:101)
	at java.desktop/java.awt.EventDispatchThread.run(EventDispatchThread.java:90)
https://ideone.com/9zTsN5
language:
Java (HotSpot 12)
created:
13 days ago
visibility:
public

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