java - 为什么@Import引入一个config不能使用这个config中@Bean注解的方法？

Question

@Configuration
public class CDPlayerConfig {

    @Bean
    public CompactDisc sgtPeppers(){
        return new SgtPeppers();
    }
    
    @Bean
    public CDPlayer cdPlay(){
        return new CDPlayer(sgtPeppers());
    }

}

这个是能执行的

把

@Bean
public CompactDisc sgtPeppers(){
    return new SgtPeppers();
}

放到另一个配置文件中，然后通过@Import引入

@Configuration
public class CDConfig {
    @Bean
    public CompactDisc sgtPeppers(){
        return new SgtPeppers();
    }
}

引入外部的配置文件

@Configuration
@Import(CDConfig.class)
public class CDPlayerConfig {
 @Bean
    public CDPlayer cdPlay(){
        return new CDPlayer(sgtPeppers());
    }
}

就找不到这个method

Answer 1

The basic concept is wrong. sgtPeppers() is a method of calling this class. If it is not defined, of course it will cause a compilation error and has nothing to do with spring.
Change it like this:

@Configuration
@Import(CDConfig.class)
public class CDPlayerConfig {
 @Bean
    public CDPlayer cdPlay(CompactDisc cd){
        return new CDPlayer(cd);
    }
}

Answer 2

Incorrect understanding

Can be used with @Bean @Qualifier