JavaSE8 a reference to the underlying abstract class as a function's argument to an object that must be a subclass

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


Code:

Abstract class Person {public abstract void SayHello ();} Class Javaer extends Person{public void SayHello () {System.out.println ("Java Hello");}} Class Demo {//abstract class reference as parameter of function//no problem public static void test (person p) {P.sayhello ();//p points to an object that must be a subclass}public static void Main ( String[] agrs) {person p = new Javaer (); test (P);}}

Results:

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JavaSE8 a reference to the underlying abstract class as a function's argument to an object that must be a subclass