The final local variable pag cannot be assigned, since it is defined in an enclosing

[croccio]

int pag=1;
...
...
//Next
			next.setIcon(new ImageIcon(path_progetto+"Media/next.png"));
			next.setBounds(455, 140, 7, 14);
			next.addMouseListener(new MouseAdapter()
			{
			    public void mouseClicked(MouseEvent e) 
			    {	
			    	pag=pag+1;
			    }
			});
			prec.addMouseListener(new MouseAdapter()
			{
			    public void mouseClicked(MouseEvent e) 
			    {
			    	pag=pag-1;
			    }
			});
			    	switch (pag) {
			    	case 1:
...
...
...
};

perchè questo codice non funziona?? nelle varibili pag ke stanno nel mouseClicked dice :

The final local variable pag cannot be assigned, since it is defined in an enclosing type

ke vuol dire?