New to Java

Hi
I wanna allow only numeric values and dot (.) in my JTextField ...

i m using the following code in the KeyTyped Method which is only allowing numeric values but not allowing dot .

        int value;
       String s;
       s =evt.getKeyText(evt.getKeyChar()) ;
      value = Integer.parseInt(s);
       if(!(value >=0) && (value<=9))
        jtf_amount1.setText(jtf_amount1.getText().substring(0,jtf_amount1.getText().length()-1));

please let me know how to allow the dot as well in my JTextField .