Implementing object-Oriented Programming with Java (4)

Interface:
1. Modifier with interface
2. All methods in an interface are abstract (no method body allowed) methods do not need to be forced to write abstract
3. All variables in the interface are constant public static final adornments do not need to be forced to write
4. Interface-oriented programming (advocating) interface variable name = new Interface Implementation ()
5. Interface is not allowed to be instantiated (cannot be new)
6. The implementation class of the interface must override all methods in the interface
7. Interface is not allowed to implement interface interface can inherit interface
8. Abstract classes can implement interfaces
9. Constructor is not allowed in the interface abstract class allows the construction method

Implementing object-Oriented Programming with Java (4)