Thank you very much.
Can you tell me, what is the difference between Image, BufferedImage and ImageIcon?

I have intorduced a long variable, "time", which takes the value from the getWhen() method. This is inside the overriden method keyReleased(). Now the overriden method keyPressed checks whether the the difference between current getWhen() and the previous getWhen() methods.

Here is the code I tried:

private  class KeyHit extends KeyAdapter{
        private long time;
        @Override
        public void keyPressed (KeyEvent ke) {
            try { 
              if (ke.getWhen() - time < 5000) {
                //ke.consume();
                ke = null;
                //System.out.println("Processing previous move");
            }
            }
            catch (NullPointerException npe) {
                //System.out.println("Null pointer");
            }
            
            int key = ke.getKeyCode();
            
            switch (key) {
                case KeyEvent.VK_RIGHT :
                    moveSprites (1);
                    break;
                case KeyEvent.VK_LEFT :
                    moveSprites (-1);
                    break;
                
                case KeyEvent.VK_UP :
                    moveSprites (-2);
                    break;
                    
                case KeyEvent.VK_DOWN :
                    moveSprites (2);
                    break;
                case KeyEvent.VK_SPACE :
                    moveSprites (-3);
                   
                default :
                    break;
            }
        }
                
        @Override
        public void keyReleased (KeyEvent ke) {
            time = ke.getWhen();
            int key = ke.getKeyCode();
            switch (key) {
                case KeyEvent.VK_RIGHT :
                    setSprites (1);
                    break;
                    
                case KeyEvent.VK_LEFT :
                    setSprites (-1);
                    break;

                default :
                    break;
            }
            
        }

    }

(The class KeyHit is defined inside another class.)
Thnaks.

Thank you.

But, I can not employ it. Can you, please, give me an example?

This is a nice tutorial. Thanks.

Can you please give me a few examples? Thanks.