The toString() problem is handled in the magic interface! !

thiefgroup

>>This phenomenon is indeed very interesting. The above few people seem to have not noticed a problem, that is, the research object here is like an "interface".
>>Rather than "class", and the interface seems to not inherit the Object class theoretically

EmptyInterface e = new SomeImplemention();
String s = e.toString();//e Since it is an instance of an interface, it proves that it is an object. It must be Object that can inherit the interface. The compiler and you and I know this. Sorry.

liux83

//e is an instance of the interface
The interface cannot have an instance, the interface only provides a series of method interfaces, and they are all empty for the polypeptide mechanism

thiefgroup

//e is an instance of the interface
>>The interface cannot have an instance, the interface only provides a series of method interfaces, and they are all empty for the polypeptide mechanism
Of course, interfaces can have instances (instance, nouns), and abstract classes can also have instances, but they cannot be instantiated directly. An object that implements an interface is an instance of this interface.

dxk_www

This is just an overwrite of toString() in the Object class, not the content in test,