KeyEvent problem

public LibraryGui(){

        this.addKeyListener(new KeyAdapter(){
            @Override
            public void keyPressed(KeyEvent e){
                switch(e.getKeyCode()){
                case KeyEvent.VK_A:
                    try{
                        l.addItem();
                    }catch(IOException e1){
                        JOptionPane.showMessageDialog(null, "Action could not be done.", "Error", JOptionPane.ERROR_MESSAGE);
                    }
                    update();
                case KeyEvent.VK_D:
                    try{
                        l.deleteItem();
                    }catch(IOException e1){
                        JOptionPane.showMessageDialog(null, "Action could not be done.", "Error", JOptionPane.ERROR_MESSAGE);
                    }
                    update();
                }
            }
        });
    }