Os:windows7 x64
Jdk:jdk-8u131-windows-x64
Ide:eclipse Oxygen Release (4.7.0)
Code:
Class Father {}//son inherits the method that is unique to Fatherclass son extends father{//subclass public void Onlyson () {System.out.println ("son Class-specific method");}} Class Demo {public static void main (string[] agrs) {//Parent class reference refers to an object of a subclass. Father f = new Son ();//coercion type conversion, supported because the parent reference F points to the child object//down transformation, the parent variable. (Son) f). Onlyson ();}}
Results:
Java is good, worth learning.
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JavaSE8 base Multi-state cast parent reference to child reference