java - 这个checkLMDao是接口，为什么可以调方法？

Question

1.并没有实现类啊？
2.@Autowired有什么用？

Answer 1

Because the specific implementation method is implemented for you by mybatis. You can study it in depth

Answer 2

1. What is the use of @Autowired?

@AutowiredYou can annotate member variables, methods and constructors to complete automatic assembly.

To put it simply: Spring helps you find a class that implements this interface and instantiates the marked variable.

2. There is no implemented class?

Because the variable is marked @Autowired.