android dagger2 自定义

@Retention(RetentionPolicy.RUNTIME)
public @interface QualifierStudent {}


@Retention(RetentionPolicy.RUNTIME)
public @interface QualifierTeacher {}

public interface  {
    String saySomething();
}

public class Student implements  {

    public String name;

    public Student() {
        this.name = "野猿新一";
    }

    @Override
    public String saySomething() {
        return String.format("我的名字叫%s啦", name);
    }
}

public class Teacher implements  {

    public String name;

    public Teacher() {
        this.name = "苍老湿";
    }

    @Override
    public String saySomething() {
        return String.format("我的名字叫%s啦", name);
    }
}

@Module
public class MainModule {

    @Provides
    @QualifierStudent
    public Person provideStudent() {
        return new Student();
    }

    @Provides
    @QualifierTeacher
    public Person provideTeacher() {
        return new Teacher();
    }
}

@Component(modules = MainModule.class)
public interface MainActivityComponent {
    void inject(MainActivity activity);
}

public class MainActivity extends AppCompatActivity {

    @Inject
    @QualifierTeacher
    Person person;

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

        DaggerMainActivityComponent.create().inject(this);
        TextView textView = findViewById(R.id.text);
        textView.setText(person.saySomething());
    }
}