JAVA DOC里面有一个Class Hierarchy,还有一个Interface Hierarchy
可以这样理解么,就是Class是已经implements的,Interface是还没有
比如Servlet包里面
Class Hierarchy
* class java.lang.Object
o class java.util.EventObject (implements java.io.Serializable)
+ class javax.servlet.ServletContextEvent
# class javax.servlet.ServletContextAttributeEvent
+ class javax.servlet.ServletRequestEvent
# class javax.servlet.ServletRequestAttributeEvent
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interface describes obligation of the classes that implement it.
class describes capability and obligation.
in Java, class hierarchy is a tree while interface hierarchy is a DAG.
【在 p***p 的大作中提到】 : JAVA DOC里面有一个Class Hierarchy,还有一个Interface Hierarchy : 可以这样理解么,就是Class是已经implements的,Interface是还没有 : 比如Servlet包里面 : Class Hierarchy : * class java.lang.Object : o class java.util.EventObject (implements java.io.Serializable) : + class javax.servlet.ServletContextEvent : # class javax.servlet.ServletContextAttributeEvent : + class javax.servlet.ServletRequestEvent : # class javax.servlet.ServletRequestAttributeEvent