JAVA子类继承父类的范例可直接运行_java子类继承父类实例

JAVA

继承

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ENTS 640 Networks and Protocols I

Fall 2013

Solutions to Homework #5

Assigned: October 19; Due: October 24

H5.1

Write a Java application with a simple class inheritance hierarchy. As shown in the UML diagram below,

it should consist of three classes. The

Student

class, representing a student’s personal and course

registration information for a given semester, which will be the superclass. The two subclasses inheriting

from the

Student

class are the

FullTimeStudent

class, representing a full-time student’s personal and

registration info, and the

PartTimeStudent

class, representing a part-time student.

The rules for valid registration are as follows. All students (both full-time and part-time) must register

for at least one course and can register for at most four courses. In addition, full-time students must

The

Student

class should have five fields: two static constants, one representing the maximum

number of classes/ courses a student can take and one representing the number of credits per class, which

is three for all classes. It should also have three instance fields:

name

, a field for the student’s name,

classes

, a field referring to a

String

array that holds the class/course names the student has registered for,

and,

numClasses

, the total number of classes the student has registered for. The constructor should create

the

classes

array, which should be initially empty (the student has not registered for any classes yet) and

initialize the other fields as well. The

getNumClasses()

method should return the number of classes the

student has registered for, and the

verifyRegistration()

method should return

true

if the student’s

registration is valid, and

false

otherwise. (Note: the student class does not have any information about

whether the student is full-time or part-time, so it should check only the registration rules that apply to all

students.) The

toString()

method should return the string representation of the object, providing all

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