JCheckBox b=new JCheckBox("down" );
     JCheckBox b1=new JCheckBox("unreachable" );
      JCheckBox b2=new JCheckBox("recovery" );
       JCheckBox b3=new JCheckBox("flapping" );
        JCheckBox b4=new JCheckBox("downtime scheduled " );
     public void itemStateChanged(ItemEvent e) {
 
        Object source = e.getItemSelectable();
 
        if (source == b) {
           System.out.println("down" );
        } else if (source == b1) {
           System.out.println("unreachable" );
        } else if (source == b2) {
            System.out.println("recovery" );
        } else if (source == b3) {
           System.out.println("flapping" );
        }
          else if (source == b4) {
           System.out.println("downtime scheduled" );
        }
    }
void remplir()
{
    try
    {
     PrintWriter out = new PrintWriter(new FileWriter("dddd.txt" );
          out.println("checkbox"+"      "+ itemStateChanged(ItemEvent e));
 
          out.println("}" );
    out.close();
}
catch(IOException e)
{
 
}
}

1. b1.addItemListener(this);

')' expected
          out.println("notification_options"+"      "+itemStateChanged(ItemEvent e));