The difference between lambda and anonymous inner class

1. The required parameter types are inconsistent

Anonymous inner class parameters can be classes , abstract class , Interface ;
lambda Parameters in can only be interfaces

2. The number of abstract methods is inconsistent

Abstract methods in anonymous inner classes can be one or more , No fixed restrictions
lambda There can only be one abstract method in the interface of

3. The implementation principle is different

Anonymous inner classes are generated after recompilation .class file
lambda It is generated dynamically at runtime .class

summary ：

When there is only one abstract method in the interface , It is recommended to use lambda expression , It simplifies the code , But when there are multiple abstract methods , You can only use anonymous inner classes to implement the specific method .