继承

1．　　实验目的

巩固如下概念：

子类的继承性，子类对象的创建过程，成员变量的继承与隐藏，方法的继承与重写。

2．　　实验要求

（1）编写一个Java应用程序，除了主类外，该程序中还要定义4个类：People、ChinaPeople、AmericanPeople和BeijingPeople类，要求如下：

 　　People类具有访问权限是protected的double型成员：height和weight，以及public void speakHello()、public void averageHeight()和public void averageWeight()方法。

 　　ChinaPeople是People类的子类，新增了public void chinaGongfu()方法。要求重写父类的public void speakHello()、public void averageHeight()和public void averageWeight()方法。

 　　AmericanPeople是People类的子类，新增了public void americanBoxing()方法。要求重写父类的public void speakHello()、public void averageHeight()和public void averageWeight()方法。

 　　BeijingPeople是ChinaPeople类的子类，新增了public void beijingOpera()方法。要求重写父类的public void speakHello()、public void averageHeight()和public void averageWeight()方法。-Inherit

1. Purpose of the experiment

Consolidation of the following concepts:

Subclass inheritance, sub-class object creation, inheritance and hiding member variables, methods, inheritance and override.

2. Experimental requirements

(1) Write a Java application, in addition to the main class of things, the program also defined four categories: People, ChinaPeople, AmericanPeople and BeijingPeople class, requirements are as follows:

　People have access to a protected class of double-type members: height and weight, as well as public void speakHello (), public void averageHeight () and public void averageWeight () method.

　ChinaPeople People class is a subclass of added public void chinaGongfu () method. As requested by the parent class public void speakHello (), public void averageHeight () and public void averageWeight () method.

　AmericanPeople People class is a subclass of added public void americanBoxing () method. As requested by the parent cl