forjonas

if (jTextField1.getText().contains(".")){

       }
       else{
            if(jTextField1.getText().equals("")){
            String current = jTextField1.getText();
            String New = current+"0.";
            jTextField1.setText(New);
            }
            else{
             String current = jTextField1.getText();
             String New = current+".";
             jTextField1.setText(New);
            }
       }