JAVA2014-12-04李蜀宁

            JButton btn = new JButton();
            btn.setText("Button");
            btn.setSize(120,20);
            btn.setLocation(10, 10);
            btn.addMouseListener(this);
            panel.add(btn);    


@Override
    public void mouseEntered(MouseEvent e) {
        // TODO Auto-generated method stub
        JComponent comp = (JComponent)e.getSource();
        
        comp.setFont(new Font(comp.getFont().getName(), comp.getFont().getStyle(), 40));
        
    }