public class PenggunaanOverriding{
    public static void main(String[] args){
        binatang b = new binatang();
        Mamalia m = new Mamalia();
        binatang bm = new Mamalia();

        b.bergerak();
        m.bergerak();
        bm.bergerak();
        bm.berkembang_biak();
    }
}