Generic understanding
Wildcard chat -JAVA generics T, E, K, V ,?
Classes, inheritance rules and implementation of interfaces
- Only inheritance between classes, and is a single inheritance, can be multi-level inheritance
- Between classes and interfaces can be implemented, a class can implement multiple interfaces
- Between the interface and the interface can not be achieved inheritance, multiple inheritance can also be multi-level inheritance, but can not inherit class
The difference between abstract classes and ordinary classes