How to Using JCheckBox of SWING (JAVA GUI)

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serverSWING

This post is 'How to using JCheckBox'.

If You run SWING, can see below picture.

I made 1 JCheckBox.

And change the name.

'Variable' is variable name in Source.

'text' is check box name in GUI.

Go to 'Source'

serverSWING.java

1. public class serverSWING implements ActionListener,ItemListener{
2.     private JFrame frame;
3.     private JTextField portNum;
4.     private JButton btnServerOpen,btnClear,btnSend;
5.     public static JEditorPane commText;
6.     ServerSocket ss;
7.     Socket socket;
8.     InetAddress ia;
9.     Thread server;
10.     public static JButton btnServerClose;
11.     public static boolean disconnected=true;
12.     private JEditorPane sendText;
13.     public static boolean echoEnable=false;
14.     private JCheckBox checkEcho;
15.     private JScrollPane scrollPane;
16. }

Line 1 : 'ItemListener' is for JCheckBox listener.

Line 14 : declared JCheckBox.

This is initailize.

1. checkEcho = new JCheckBox("Echo Mode");
2. checkEcho.setBounds(493, 375, 119, 23);
3. frame.getContentPane().add(checkEcho);
4. checkEcho.addItemListener(this);

Line 4 : registration to listener.

This is auto adding listener code.

1.     @Override
2.     public void itemStateChanged(ItemEvent e) {
3.         if(e.getSource()==checkEcho){
4.             if(ItemEvent.SELECTED==e.getStateChange())
5.                 echoEnable=true;
6.             else
7.                 echoEnable=false;
8.            
9.             System.out.println("now echoEnable: "+echoEnable);
10.             checkEcho();
11.         }
12.        
13.     }

Line 3 : 'e.getSource()' is JCheckBox's name.

Line 4: 'ItemEvent.SELECTED' mean checked JCheckBox.