First, the difference between final, finally, finalize.

Answer: final is used to declare properties, methods and classes, which respectively means that properties are immutable, methods cannot be overridden, and classes cannot be inherited. Finally is part of the exception handling statement structure, indicating that it is always executed. finalize is a method of the Object class. This method of the recycled object will be called when the garbage collector is executed. This method can be overridden to provide other resource recycling during garbage collection, such as closing files, etc.

Second, Anonymous Inner Class (Anonymous Inner Class) can extend (inherit) other classes, can it implement (implement) interface (interface)?

Answer: You can inherit other classes or complete other interfaces. This method is commonly used in swing programming.

Third, The more you can tell about the difference between Static Nested Class and Inner Class, the better (some interview questions are very general).

Fourth, the difference between & and &&.