The method of the parent class as the parameter list in the Java polymorphism

Pet pet=new Dog (); Pet is the parent class, and dog is a subclass. This method is the parent class that does the type, and the subclass is instantiated.

Related examples:

Examples of employees returning home;

1, first to do an abstract parent class, including the idea of walking.

Package Cn.day1;public Abstract class Traffic {public abstract void run ();

　　

2, in creating a class that contains the idea of going home.

Package Cn.day1;public class Employee {public void gohome (traffic tool) {Tool.run ();}}

　　

3, create two subclasses, inherit the parent class. Subclass contains two tools to go home.

Package Cn.day1;public class Tube extends traffic {@Overridepublic void run () {System.out.println ("Tube Run");}}

　　

Package Cn.day1;public class Car extends traffic {@Overridepublic void run () {System.out.println ("Car Run");}}

　　

4, call

Package Cn.day1;public class MyText {public static void main (string[] args) {//Staff employee Ele=new employee ();//Transport Traffi C tra=new Car (); Ele.gohome (TRA);}}

I learn not solid, later in-depth study I will optimize the content of this chapter!!!

The method of the parent class as the parameter list in the Java polymorphism