MainActivity.java

public class MainActivity extends AppCompatActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        Body body = createBody();

        TextView bloodTV = findViewById(R.id.blood_tv);

        bloodTV.setText("Kind of Blood: " + body.getBlood().getKindOfBlood());
    }

    private Body createBody() {
        Doctor doctor = DaggerDoctor.create();
        return doctor.injectBlood();
    }
}