我怎么能在spring框架上使用抽象类？

Question

我是那个倾向于使用Spring Boot编写代码的人。然后，当我尝试编写使用抽象类的代码时，我收到如下错误。Description:Parameter 0 of constructor in com.in28minutes.spring.practice.springmasterclasspractice.devicefactory. LaptopManufacturingProcess required a bean of type 'java.lang.String' that could not be found.Action:Consider defining a  bean of type 'java.lang.String' in your configuration.你们能告诉我如何解决这个错误吗？Spring Boot：v2.1.4 Java：10.0.2 Maven：3.6.0SpringMasterClassPracticeDeviceFactoryApplication 类import org.slf4j.Logger;import org.slf4j.LoggerFactory;import org.springframework.boot.SpringApplication;import org.springframework. boot.autoconfigure.SpringBootApplication;import org.springframework.context.ConfigurableApplicationContext;@SpringBootApplicationpublic  class SpringMasterClassPracticeDeviceFactoryApplication {     private static Logger LOGGER = LoggerFactory.getLogger(SpringMasterClassPracticeDeviceFactoryApplication.class);     public static void main(String[] args) {         ConfigurableApplicationContext applicationContext = SpringApplication                 .run(SpringMasterClassPracticeDeviceFactoryApplication.class, args);         ManufacturingImpl manufacturingImpl = applicationContext.getBean(ManufacturingImpl.class);         System.out.println(manufacturingImpl);         // manufacturingImpl.manifactureProduct("Laptop Process");         LOGGER.info("{}", manufacturingImpl);     }}ManufacturingImpl 类import org.springframework.beans.factory.annotation.Autowired;import org.springframework.beans.factory. annotation.Qualifier;import org.springframework.stereotype.Component;@Componentpublic class ManufacturingImpl {     @Autowired     @Qualifier("laptop")     private GeneralManufacturingProcess generalManufacturingProcess;     public void manifactureProduct(String processName) {         System.out.println(generalManufacturingProcess);         generalManufacturingProcess.launchProcess();     }}GeneralManufacturingProcess 类public abstract class GeneralManufacturingProcess {     private String processName;

Answer 1

generalManufacturingProcess是一个抽象类，无法实例化