JavaSE8 the basic abstract class implements an interface that contains only abstract methods

Os:windows7 x64
Jdk:jdk-8u131-windows-x64
Ide:eclipse Oxygen Release (4.7.0)


Code:

interface, the class that uses the interface indicates that the class can implement all the functions in the interface//This interface is equivalent to a certificate, proving that you have the corresponding ability! Interface Persontrain {//As long as the function declaration, do not specifically implement public abstract void Writebook ();} Draw line class implements an interface abstract class person implements Persontrain {    }class Javaer extends person {public void Writebook () {Syste M.out.println ("write book");}} Class Demo {public static void main (string[] agrs) {Javaer j = new Javaer (); J.writebook ();}}

Results:

Feelings:

When I wrote this code, I did not realize that the person as abstract class actually did not implement the method of the interface, the compilation did not error the phenomenon. Interesting!

Javaer inherits the person, the abstract class person implements the interface Persontrain, so Javaer needs to implement the functions in the interface Persontrain.

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JavaSE8 the basic abstract class implements an interface that contains only abstract methods