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  1. import java.applet.Applet;
  2. import java.awt.Button;
  3. import java.awt.Graphics;
  4. import java.awt.event.ActionEvent;
  5. import java.awt.event.ActionListener;
  6.  
  7. public class Demo extends Applet {
  8.  
  9. 	private Button button;
  10. 	private int x = 225;
  11. 	private int y = 50;
  12. 	private int WIDTH = 50;
  13. 	private int HEIGHT = 400;
  14.  
  15. 	@Override
  16. 	public void init() {
  17. 		// TODO Auto-generated method stub
  18. 		button = new Button("Cù Trọng Xoay!");
  19. 		add(button);
  20.  
  21. 		button.addActionListener(new ActionListener() {
  22.  
  23. 			@Override
  24. 			public void actionPerformed(ActionEvent e) {
  25. 				// TODO Auto-generated method stub
  26. 				int temp = x;
  27. 				x = y;
  28. 				y = temp;
  29.  
  30. 				temp = WIDTH;
  31. 				WIDTH = HEIGHT;
  32. 				HEIGHT = temp;
  33.  
  34. 				repaint();
  35. 			}
  36. 		});
  37. 	}
  38.  
  39. 	@Override
  40. 	public void paint(Graphics g) {
  41. 		// TODO Auto-generated method stub
  42. 		setSize(500, 500);
  43.  
  44. 		g.drawRect(x, y, WIDTH, HEIGHT);
  45.  
  46. 		setVisible(true);
  47. 	}
  48.  
  49. }
  50.  
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:7: error: class Demo is public, should be declared in a file named Demo.java
public class Demo extends Applet {
       ^
1 error
stdout
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Standard output is empty
https://ideone.com/HwFsRV
language:
Java (HotSpot 12)
created:
7 years ago
visibility:
public

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