Polimoryzm

public class Base {

    public static String _static="base_static";
    public String _inst="base_inst";

     public String publicMethod(){
         return "base_public_method";
     }
     private String privateMethod(){
         return "base_public_method";
     }
}

public class Subclass extends Base{

    public static String _static="subclass_static";
    public String _inst="subclass_inst";

     public  String publicMethod(){
         return "subclasss_public_method";
     }
}

 @Test
    public void testprzyslaniania(){
        
        Base base = new Base();
        prn(base._inst); //base_inst
        prn(base._static);//base_static
        prn(base.publicMethod());//base_public_method

        Subclass sub = new Subclass();
        prn(sub._inst);//subclass_inst
        prn(sub._static);//subclass_static
        prn(sub.publicMethod());//subclasss_public_method

        Base base_ref= sub;
        prn(base_ref._inst);//base_inst
        prn(base_ref._static);//base_static
        prn(base_ref.publicMethod());//subclasss_public_method

        Base base_base_cast=(Base)sub;
        prn(base_base_cast._inst);//base_inst
        prn(base_base_cast._static);//base_static
        prn(base_base_cast.publicMethod());//subclasss_public_method
        
          /**
         * Wnioski:
           * + dynamicznie (po typie obiektu) są tlko metody
           * + zmienne static / inst = są wybierane po typie referencji!
         */
    }