实验二-面向对象程序设计

1、精选优质文档-倾情为你奉上EXP2课题(项目)名称: 实验二 面向对象程序设计计划学时:2 实验类型: 1.演示性 2.验证性 3.综合性 4.设计性 5.其它授课日期: 年 月 日 第 周 星期 第 节实验目的1. 验证面向对象三大特性2. 学习封装的实现3. 学习继承的实现4. 编写多态实例5. 学习抽象类的使用6. 学习接口的使用实验要求1. 掌握封装的实现方法2. 掌握继承的编程方式和思想3. 理解多态现象4. 掌握抽象类和接口的使用实验内容与步骤1. 封装的实现（1） 编写程序模拟个人银行账号类。考虑个人银行的特点，建立类模型（注意属性和方法的访问权限修饰符）参考代码public c

2、lass BankAccount private String accountID;private String password;private int balance;public BankAccount(String accountID,String password,String operator)this.accountID=accountID;this.password=password;this.balance=0;System.out.println("Create a BankAccount");System.out.println("Accou

3、ntID:"+this.accountID);System.out.println("Current Balance:"+this.balance);System.out.println("Operator:"+operator);System.out.println("Save Account info to Database");public void queryBalance(String password)if(password=this.password)System.out.println("Passw

4、ord OK");System.out.println("Current Account Balance:"+this.balance);elseSystem.out.println("Password Erro");public void changePassword(String oldPassword,String newPassword)if(oldPassword=this.password)System.out.println("Password OK");this.password=newPassword;Sy

5、stem.out.println("Change Passord OK");elseSystem.out.println("Password Erro");public void deposit(int money,String operator)this.balance+=money;System.out.println("add balance OK.Operator:"+operator);System.out.println("Save Account change to database");public

6、 void withdraw(String password,int money,String operator)if(password=this.password)System.out.println("Password OK");if(this.balance>money)this.balance-=money;System.out.println("withdraw:"+money+" ok, Operator:"+operator );System.out.println("Current Account Ba

7、lance:"+this.balance);System.out.println("Save Account change to database");elseSystem.out.println("withdraw:"+money+" erro. Because of not enough balance");elseSystem.out.println("Password Erro");（2） 编写测试类，完成如下（1）中类方法的测试实现如下业务：开户，存款100，查询余额，取款50，查询余额，取款2

8、00，查询余额public class Test1 public static void main(String args) BankAccount bankaccount =new BankAccount("", "", "TOM");bankaccount.queryBalance("");bankaccount.changePassword("","");bankaccount.deposit(100,"TOM");bankaccount.withd

9、raw("",50,"TOM");2. 继承的实现（1） 按如下类图编写代码 参考代码class Person String id;String name;String age;public void sleep() System.out.println("I am Person,I am sleeping");public void eat() System.out.println("I am Person,I am eating");class Student extends Person String sno

10、;public void study() System.out.println("I am Student,I am studying");class Teacher extends Person String tid;public void tech() System.out.println("I am Student,I am taching");（2） 编写测试类并创建main()方法，完成如下操作A 分别创建Person、Student、Teacher对象，完成属性和每个方法的调用测试B 在Student和Teacher中完成eat()方法的重写

11、C 编写类型转化示例（向上类型转化、向下类型转化）3. 多态现象 在完成（2）中Student、Teacher类eat()方法重写后，在测试类中编写如下代码并在main()方法中调用static void askAllToEat(Person ps) for(int i=0;i<ps.length;i+) psi.eat(); psi.sleep(); 从以上代码中体会多态现象。public class Test2 public static void main(String args) Person person = new Person();person.sleep();person

12、.eat();Student student = new Student();student.sleep();student.eat();student.study();Teacher teacher = new Teacher();teacher.sleep();teacher.eat();teacher.tech();static void askAllToEat(Person ps) for (int i = 0; i < ps.length; i+) psi.eat();psi.sleep();4. 抽象类的使用编写以上类图所示类，并编写测试代码测试抽象类的使用参考代码abstr

13、act class Printerprivate String printerType;Printer(String printerType)this.printerType=printerType;abstract void print(String txt);void showMyType()System.out.println("My Type is:"+printerType);class InkPrinter extends PrinterInkPrinter(String inkPrinterType)super(inkPrinterType);void pri

14、nt(String txt)System.out.println("I am Ink Printer");System.out.println("Start to Print:"+txt);class LasertPrinter extends PrinterLasertPrinter(String laserPrinterType)super(laserPrinterType);void print(String txt)System.out.println("I am Lasert Printer");System.out.pri

15、ntln("Start to Print:"+txt);编写测试类及main() 方法，完成如下操作A. 创建Printer,InkPrinter,LaserPrinter类的对象。B. 设计并编写演示多态现象的代码5. 接口的使用编写以上类图的代码，并编写测试类测试接口的使用参考代码interface IScanvoid scan();abstract class Printerprivate String printerType;Printer(String printerType)this.printerType=printerType;abstract void p

16、rint(String txt);void showMyType()System.out.println("My Type is:"+printerType);abstract class InkPrinter extends PrinterInkPrinter(String inkPrinterType)super(inkPrinterType);void print(String txt)System.out.println("I am Ink Printer");System.out.println("Start to Print:"+txt);class LasertPrinter extends PrinterLasert