Code:

    public void run() {
        // TODO Auto-generated method stub
        
        try
        {
            Robot robot = new Robot();
            while (working)
            {
                
                                
                 robot.keyRelease(KeyEvent.VK_ALT);
                 
            
                 robot.keyRelease(KeyEvent.VK_TAB);
                 
            
                
                 try { 
                     Thread.sleep(10); 
                 
                 } catch(Exception e) {
                     
                     
                 }
                }
        } catch (Exception e) {
            e.printStackTrace(); 
            
            System.exit(-1); 
            }
    }

Code:

@Override
    public boolean dispatchKeyEvent(KeyEvent e) {
        // TODO Auto-generated method stub
         
         if (e.getID() == KeyEvent.KEY_TYPED) {
                int code = e.getKeyChar();
              
                if (KeyEvent.VK_WINDOWS == code) {
                    

                    return true;
                    
                }
            }
         
            return false;
       }