What is the mechanism of interface multi-inheritance in Java
This article mainly introduces what is the interface multi-inheritance mechanism in Java. It is very detailed and has a certain reference value. Friends who are interested must read it!
Cause of the problem
Today, when I was looking at the collection source code, I suddenly saw that the interface inherited the interface, and I felt a little different. in the past, writing code is that the class inherits a class and implements the interface. When I wrote so much, I was a little surprised to see that the interface inherited the interface. I thought there was something wrong with it. As for the test, I consulted some information.
An interface can inherit multiple interfaces at the same time
Writing interface test
Public interface Jiekou extends Jiekou1,Jiekou2 {void jiekou ();} public interface Jiekou1 {void jiekou1 ();} public interface Jiekou2 {void jiekou2 ();} public interface Jiekou3 {void jiekou3 ();}
As mentioned above, there is no problem, so Java supports interface multi-inheritance
Interface cannot implement any interface
Code verification
Public interface Jiekou implements Jiekou2 {void jiekou ();}
As shown in the figure, No implements clause allowed for interface
As above-the interface cannot implement any interface
A class can implement multiple interfaces
Class implements multi-interface code
Public class Aggregate implements Jiekou,Jiekou3 {@ Override public void jiekou () {} @ Override public void jiekou1 () {} @ Override public void jiekou2 () {} @ Override public void jiekou3 () {}}
There is no problem for the above class to implement multiple interfaces.
A class can inherit only one parent class
First build the parent and subclass code
Public class FatherOne {} public class FatherTwo {} / Class inherits a class is not a problem public class Son extends FatherOne {}
If you have more than one class, you will be prompted: Class cannot extend multiple classes
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