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  1. /*
  2.  * To change this license header, choose License Headers in Project Properties.
  3.  * To change this template file, choose Tools | Templates
  4.  * and open the template in the editor.
  5.  */
  6. package SwingPacket;
  7.  
  8. import java.awt.Color;
  9. import java.awt.Font;
  10. import java.awt.GridLayout;
  11. import java.awt.HeadlessException;
  12. import javax.swing.BorderFactory;
  13. import javax.swing.JCheckBox;
  14. import javax.swing.JFrame;
  15. import javax.swing.JPanel;
  16. import javax.swing.border.Border;
  17. import javax.swing.border.TitledBorder;
  18.  
  19. /**
  20.  *
  21.  * @author AM
  22.  */
  23. public class JCheckBoxDemo extends JFrame {
  24.  
  25.     JCheckBox jcb1,jcb2,jcb3,jcb4;
  26.  
  27.     public JCheckBoxDemo(String title) throws HeadlessException {
  28.         super(title);
  29.         this.setSize(400,250);
  30.  
  31.         this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
  32.         this.setLocationRelativeTo(null);
  33.         this.setVisible(true);
  34.         creatAndShow();
  35.  
  36.  
  37.     }
  38.  
  39.     private void creatAndShow() {
  40.         JPanel jpn = new JPanel(new GridLayout(2,2));
  41.         Font font = new Font("Font.BOLD",20,20);
  42.  
  43.         Border border = BorderFactory.createLineBorder(Color.yellow,5);
  44.         TitledBorder title = BorderFactory.createTitledBorder(border,"Môn học ưa thích");
  45.         jpn.setBorder(title);
  46.  
  47.         jcb1 = new JCheckBox("C");
  48.         jcb1.setFont(font);
  49.         jcb2 = new JCheckBox("C++");
  50.         jcb2.setFont(font);
  51.         jcb3 = new JCheckBox("Java");
  52.         jcb3.setFont(font);
  53.         jcb4 = new JCheckBox("C#");
  54.         jcb4.setFont(font);
  55.  
  56.         jpn.add(jcb1);
  57.         jpn.add(jcb2);
  58.         jpn.add(jcb3);
  59.         jpn.add(jcb4);
  60.  
  61.  
  62.         this.getContentPane().add(jpn);
  63.  
  64.  
  65.  
  66.     }
  67.  
  68.  
  69.     public static void main(String[] args) {
  70.       new JCheckBoxDemo("My window");
  71.  
  72.  
  73.  
  74.     }
  75. }
  76.  
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:23: error: class JCheckBoxDemo is public, should be declared in a file named JCheckBoxDemo.java
public class JCheckBoxDemo extends JFrame {
       ^
1 error
stdout
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Standard output is empty
https://ideone.com/j84DuI
language:
Java (HotSpot 12)
created:
7 years ago
visibility:
public

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