java class mobil constructor

class Mobil1 {
    String warna ;
Mobil1(){} // constructor
void jalan_maju(){
    System.out.println("Maju aja ahh...");
}
void jalan_mundur(){
    System.out.println("Mundur aja ahh...");
}
public static void main(String[] args)  {
    Mobil1 Mobil_Ferariku = new Mobil1();
    Mobil_Ferariku.jalan_mundur();
    Mobil_Ferariku.jalan_maju();
}
}