实验二-面向对象程序设计

1、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 class BankAcco

2、unt 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(AccountID:+this.accountID);System.ou

3、t.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(Password OK);System.out.println(Current Account Balance:+this.balance);elseSystem.ou

4、t.println(Password Erro);public void changePassword(String oldPassword,String newPassword)if(oldPassword=this.password)System.out.println(Password OK);this.password=newPassword;System.out.println(Change Passord OK);elseSystem.out.println(Password Erro);public void deposit(int money,String operator)t

5、his.balance+=money;System.out.println(add balance OK.Operator:+operator);System.out.println(Save Account change to database);public void withdraw(String password,int money,String operator)if(password=this.password)System.out.println(Password OK);if(this.balancemoney)this.balance-=money;System.out.pr

6、intln(withdraw:+money+ ok, Operator:+operator );System.out.println(Current Account Balance:+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

7、下业务：开户，存款100，查询余额，取款50，查询余额，取款200，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.withdraw(,50,TOM);2. 继承的实现（1） 按如下类图编写代码 参考代码class Person S

8、tring 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;public void study() System.out.println(I am Student,I am studying);class Teacher extends Person Stri

9、ng 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)

10、 for(int i=0;ips.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.eat();Student student = new Student();student.sleep();student.eat();student.study();Teacher teacher = new Teacher();teacher.slee

11、p();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abstract class Printerprivate String printerType;Printer(String printerType)this.printerType=printerType;abstract void print(String txt);vo

12、id showMyType()System.out.println(My Type is:+printerType);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 PrinterLasertPrinter(String

13、 laserPrinterType)super(laserPrinterType);void print(String txt)System.out.println(I am Lasert Printer);System.out.println(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

14、 Printerprivate String printerType;Printer(String printerType)this.printerType=printerType;abstract void print(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 PrinterLa