rate_text.textProperty().addListener(new ChangeListener<String>() {
@Override
public void changed(ObservableValue<? extends String> observable, String oldValue, String newValue) {
String s="";
for(char c : newValue.toCharArray()){
if(((int)c >= 48 && (int)c <= 57 || (int)c == 46)){
s+=c;
}
}
rate_text.setText(s);
}
});
This works fine as it allows you to enter only integer value and decimal value (having ASCII code 46).