Keywords implements and @override

implements

implements Is a keyword used by a class to implement an interface , Is to rewrite abstract methods in an interface .

Interfaces can be multiple implements

The interface only defines , Abstract classes can have definitions and implementations

The field definition of the interface defaults to :public static final

mplements The common explanation for the role of is to achieve polymorphism , An interface can have multiple implementations , The interface user calls the interface in one way , Keep the user code stable , Specifies that implementation classes can be dynamically implemented at run time , You can also specify in the configuration file .

If used at the same time extends and implements When ,extends Must be on implements Before keywords .

Such as ： class A extends B implements C.

@Override  rewrite

@Override yes java Annotation labels in Used for marking @Override Act on method , Used to indicate that this method is overridden from the parent class , Detect syntax format during compilation