使用自动连接从实现类设置抽象类的属性

// 抽象类
public abstract class AbstractService {
    protected Dependency dependency;

    public void setDependency(Dependency dependency) {
        this.dependency = dependency;
    }

    public abstract void doSomething();
}

// 实现类
public class ConcreteService extends AbstractService {
    @Override
    public void doSomething() {
        dependency.performAction();
    }
}

// 依赖类
public class Dependency {
    public void performAction() {
        System.out.println("Dependency action performed.");
    }
}

// 使用Spring框架进行自动连接
@Configuration
public class AppConfig {
    @Bean
    public Dependency dependency() {
        return new Dependency();
    }

    @Bean
    public ConcreteService concreteService(Dependency dependency) {
        ConcreteService service = new ConcreteService();
        service.setDependency(dependency);
        return service;
    }
}

// 主程序
public class Main {
    public static void main(String[] args) {
        ApplicationContext context = new AnnotationConfigApplicationContext(AppConfig.class);
        ConcreteService service = context.getBean(ConcreteService.class);
        service.doSomething();
    }
}