public abstract interface 等效于 public interface
public interface 为隐式申明
在JDK文档中提到:
1>Think of an interface as a 100-percent abstract class.
2>深入的描述:
Typing in the abstract modifier is considered redundant; interfaces are implicitly abstract whether you type abstract or not. You just need to know that both of these declarations are legal, and functionally identical:
public abstract interface Rollable { }
public interface Rollable { } The public modifier is required if you want the interface to have public rather than default access.
一句话描述: 在Interface申明时含不含abstract都一样!
//////////////////////////////////////////////////////////以下为错误描述//////////////////////////////////////////////////////
abstract interface 和单纯的interface的区别是:
Class 和 Class 之间是 extends
Interface 和 Interface 之间是 extends
Class 和 Interface 之间是 implements
Interface 和 abstract Interface 之间仅仅只能被你自己定义的接口extends，不可能implements, implements是Class和Interface之间的"专利"
一句话 就是 abstract interface 只能被interface继承,不能直接被类实现