我们可以在spring表达式中设置默认值

{表达式？：默认值}

//set deafult value for street

@Value("#{address.street ?: 'baker lane'}")
private String street;

您可以在构造函数上使用自动关联并修改person的行为。
你的面试官可能希望你能解释一下

@Component
class Person{

  private Address add;

  @Autowired
  public Person(Address add) {    <--- An instance of Address will be injected here
  this.add = add;

 //this.add.setStreet("Custom Street");  <--- you can modify that here before the Autowiring constructor ends

  /* if (add.getStreet().isEmpty()) {   <--- you can do whatever you want inside the constructor
      add.setStreet("Should not be empty") <--- you can check conditionally and set everything you want
   } */

  }

}

@Component
class Address{
   String street;
}