The difference between lambda expressions and anonymous inner classes

Lambda The difference between expressions and anonymous inner classes

• The types required are different

  • Anonymous inner class ： It can be an interface , It can also be an abstract class , It can also be a concrete class
  • Lambda expression ： Only interfaces

• Use restrictions are different ：

  • If there is only one abstract method in the interface , have access to Lambda expression , You can also use anonymous inner classes
  • If there is more than one abstract method in the interface , Only anonymous inner classes can be used , They can't be used Lambda expression

• Realization principle ：

  • Anonymous inner class ： After the compilation , Produce a single .class Bytecode file
  • Lambda expression ： After the compilation , No separate .class Bytecode file . The corresponding bytecode will be generated dynamically at runtime .