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  1. import javax.swing.*;
  2. import java.awt.*;
  3. import java.awt.event.*;
  4.  
  5. class SwingIO extends JFrame {
  6.     private final JTextArea output = new JTextArea(10, 30);
  7.     private final JTextField input = new JTextField(30);
  8.     private final JButton send = new JButton("Send");
  9.  
  10.     public SwingIO() {
  11.         super("IO Interface");
  12.         output.setEditable(false);
  13.         JScrollPane scroll = new JScrollPane(output);
  14.  
  15.         send.addActionListener(e -> {
  16.             String text = input.getText();
  17.             if (!text.isBlank()) {
  18.                 output.append(text + "\n");
  19.                 input.setText("");
  20.             }
  21.         });
  22.  
  23.         JPanel panel = new JPanel(new BorderLayout());
  24.         panel.add(input, BorderLayout.CENTER);
  25.         panel.add(send, BorderLayout.EAST);
  26.  
  27.         setLayout(new BorderLayout());
  28.         add(scroll, BorderLayout.CENTER);
  29.         add(panel, BorderLayout.SOUTH);
  30.         pack();
  31.         setDefaultCloseOperation(EXIT_ON_CLOSE);
  32.         setLocationRelativeTo(null);
  33.         setVisible(true);
  34.     }
  35.  
  36.     public static void main(String[] args) {
  37.         SwingUtilities.invokeLater(SwingIO::new);
  38.     }
  39. }
  40.  
Success #stdin #stdout #stderr 0.23s 67416KB
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Standard input is empty
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Standard output is empty
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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/javax.swing.JFrame.<init>(JFrame.java:224)
	at SwingIO.<init>(Main.java:11)
	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/TOdhup
language:
Java (HotSpot 12)
created:
8 hours ago
visibility:
public

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