JFormattedTextfield

final JTextField text = new JTextField(); 
text.setBackground(Color.RED); 

text.addKeyListener(new KeyListener() 
{ 
    private final SimpleDateFormat format = new SimpleDateFormat("dd/MM/yyyy"); 
     
    @Override 
    public void keyReleased(KeyEvent ke)  
    { 
        try 
        { 
            Date d = format.parse(text.getText()); 
            //System.out.println(d); 
            text.setBackground(Color.GREEN); 
        } 
        catch (Exception e) 
        { 
            //System.out.println(e); 
            text.setBackground(Color.RED); 
        } 
    } 
         
    public void keyPressed(KeyEvent ke) {} 
    public void keyTyped(KeyEvent ke) {} 
});