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  1.  
  2. import java.awt.Color;
  3. import java.awt.Dimension;
  4. import java.awt.Graphics;
  5. import javax.swing.JFrame;
  6. import javax.swing.JLabel;
  7. import javax.swing.JPanel;
  8.  
  9. public class GUI extends JFrame{
  10.  
  11.     public GUI() {
  12.         setTitle("Frame");
  13.         setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
  14.         add(new MainPanel());
  15.         setResizable(false);
  16.         pack();
  17.         setVisible(true);
  18.     }
  19.  
  20.     public static void main(String[] args) {
  21.         new GUI();
  22.     }
  23. }
  24.  
  25. class MainPanel extends JPanel{
  26.  
  27. 	private final Dimension size = new Dimension(500, 500);
  28.  
  29. 	public MainPanel() {
  30.  
  31.         JLabel label = new JLabel();
  32.         setBackground(Color.black);
  33.         label.setText("Hello World");
  34.         label.setForeground(Color.green);
  35.         add(label);
  36. 	}
  37.  
  38.     @Override
  39. 	public void paintComponent(Graphics g) {
  40.     	super.paintComponent(g);
  41.         g.setColor(Color.GREEN);
  42.         g.drawLine(0, 250, 500, 250);
  43.     }
  44.  
  45.     @Override
  46.     public Dimension preferredSize() {
  47.     	return size;
  48.     }
  49. }
Compilation error #stdin compilation error #stdout 0s 0KB
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stdin
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Standard input is empty
compilation info 
Main.java:9: error: class GUI is public, should be declared in a file named GUI.java
public class GUI extends JFrame{
       ^
Note: Main.java uses or overrides a deprecated API.
Note: Recompile with -Xlint:deprecation for details.
1 error
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Standard output is empty
https://ideone.com/eTkkvL
language:
Java (HotSpot 12)
created:
4 years ago
visibility:
public

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