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1、Java 基础实战Bank 项目实验题目 1：创建一个简单的银行程序包实验目的：Java 语言中面向对象的封装性及构造器的创建和使用。实验说明：在这个练习里，创建一个简单版本的 Account 类。将这个源文件放入 banking 程序包中。在创建单个帐户的默认程序包中，已编写了一个测试程序 TestBanking。这个测试程序初始化帐户余额，并可执行几种简单的事物处理。最后，该测试程 序显示该帐户的最终余额。提示：1创建 banking 包2 在 banking 包下创建 Account 类。该类必须实现上述 UML 框图中的模型。a. 声明一个私有对象属性：balance，这个属性保留了银。

2、行帐户的当前(或 即时)余额。b. 声明一个带有一个参数(init_balance)的公有构造器，这个参数为 balance 属性赋值。c. 声明一个公有方法 geBalance，该方法用于获取经常余额。d. 声明一个公有方法 deposit,该方法向当前余额增加金额。e. 声明一个公有方法 withdraw 从当前余额中减去金额。3打开TestBanking.java文件，按提示完成编写，并编译 TestBanking.java 文件。4 运行 TestBanking 类。可以看到下列输出结果：Creating an account with a 500.00 balanceWithdraw。

3、 150.00Deposit 22.50Withdraw 47.62The account has a balance of 324.88/TestBanking.java 文件/* This class creates the program to test the banking classes.* It creates a new Bank, sets the Customer (with an initial balance),* and performs a series of transactions with the Account object.*/package test;i。

4、mport banking.*;public class TestBanking public static void main(String args) Account account;/ Create an account that can has a 500.00 balance.System.out.println(Creating an account with a 500.00 balance.);/codeSystem.out.println(Withdraw 150.00);/codeSystem.out.println(Deposit 22.50);/codeSystem.o。

5、ut.println(Withdraw 47.62);/code/ Print out the final account balanceSystem.out.println(The account has a balance of + account.getBalance();Java 基础实战Bank 项目实验题目 2：扩展银行项目，添加一个 Customer 类。Customer 类将包含一个 Account对象。实验目的：使用引用类型的成员变量。提 示：1. 在banking包下的创建Customer类。该类必须实现上面的UML图表中的模型。a. 声明三个私有对象属性：firstNam。

6、e、lastName 和 account。b. 声明一个公有构造器，这个构造器带有两个代表对象属性的参数(f 和 l)c. 声明两个公有存取器来访问该对象属性，方法 getFirstName 和 getLastName 返回相应的属性。d. 声明 setAccount 方法来对 account 属性赋值。e. 声明 getAccount 方法以获取 account 属性。2. 在 exercise2 主目录里，编译运行这个 TestBanking 程序。应该看到如下输出结果:Creating the customer Jane Smith.Creating her account with a。

7、 500.00 balance.Withdraw 150.00Deposit 22.50Withdraw 47.62Customer Smith, Jane has a balance of 324.88/TestBanking.java 文件/* This class creates the program to test the banking classes.* It creates a new Bank, sets the Customer (with an initial balance),* and performs a series of transactions with th。

8、e Account object.*/import banking.*;public class TestBanking public static void main(String args) Customer customer;Account account;/ Create an account that can has a 500.00 balance.System.out.println(Creating the customer Jane Smith.);/codeSystem.out.println(Creating her account with a 500.00 balan。

9、ce.);/codeSystem.out.println(Withdraw 150.00);/codeSystem.out.println(Deposit 22.50);/codeSystem.out.println(Withdraw 47.62);/code/ Print out the final account balanceSystem.out.println(Customer + customer.getLastName()+ , + customer.getFirstName()+ has a balance of + account.getBalance();Java 基础实战B。

10、ank 项目实验题目 3：修改 withdraw 方法以返回一个布尔值，指示交易是否成功。实验目的：使用有返回值的方法。提 示：1 修改 Account 类a. 修改 deposit 方法返回 true(意味所有存款是成功的)。b. 修改 withdraw 方法来检查提款数目是否大于余额。如果amt小于 balance, 则从余额中扣除提款数目并返回 true，否则余额不变返回 false。2 在 exercise3 主目录编译并运行 TestBanking 程序，将看到下列输出;Creating the customer Jane Smith.Creating her account wit。

11、h a 500.00 balance. Withdraw 150.00: trueDeposit 22.50: true Withdraw 47.62: true Withdraw 400.00: falseCustomer Smith, Jane has a balance of 324.88/TestBanking.java 文件/* This class creates the program to test the banking classes.* It creates a new Bank, sets the Customer (with an initial balance),*。

12、 and performs a series of transactions with the Account object.*/import banking.*;public class TestBanking public static void main(String args) Customer customer;Account account;/ Create an account that can has a 500.00 balance.System.out.println(Creating the customer Jane Smith.);/codeSystem.out.pr。

13、intln(Creating her account with a 500.00 balance.);/code/ Perform some account transactionsSystem.out.println(Withdraw 150.00: + account.withdraw(150.00);System.out.println(Deposit 22.50: + account.deposit(22.50);System.out.println(Withdraw 47.62: + account.withdraw(47.62);System.out.println(Withdra。

14、w 400.00: + account.withdraw(400.00);/ Print out the final account balanceSystem.out.println(Customer + customer.getLastName()+ , + customer.getFirstName()+ has a balance of + account.getBalance();Java 基础实战Bank 项目实验题目 4：将用数组实现银行与客户间的多重关系。实验目的：在类中使用数组作为模拟集合操作。提示：对银行来说，可添加 Bank 类。 Bank 对象跟踪自身与其客户间的关系。。

15、用 Customer 对象的数组实现这个集合化的关系。还要保持一个整数属性来跟踪银 行当前有多少客户。a. 创建 Bank 类b. 为 Bank 类 增 加 两 个 属 性 ： customers(Customer对象的数组 ) 和 numberOfCustomers(整数，跟踪下一个 customers 数组索引)c. 添加公有构造器，以合适的最大尺寸(至少大于 5)初始化 customers 数组。d. 添加 addCustomer 方法。该方法必须依照参数(姓，名)构造一个新的 Customer对象然后把它放到 customer 数组中。还必须把 numberofCustomers 属性。

16、的值加 1。e. 添加 getNumOfCustomers 访问方法，它返回 numberofCustomers 属性值。f. 添加 getCustomer方法。它返回与给出的index参数相关的客户。g. 编译并运行 TestBanking 程序。可以看到下列输出结果：Customer 1 is Simms,JaneCustomer 2 is Bryant,OwenCustomer 3 is Soley,TimCustomer 4 is Soley,Maria/TestBanking.java 文件/* This class creates the program to test the b。

17、anking classes.* It creates a new Bank, sets the Customer (with an initial balance),* and performs a series of transactions with the Account object.*/import banking.*;public class TestBanking public static void main(String args) Bank bank = new Bank();/ Add Customer Jane, Simms/code/Add Customer Owe。

18、n, Bryant/code/ Add Customer Tim, Soley/code/ Add Customer Maria, Soley/codefor ( int i = 0; i bank.getNumOfCustomers(); i+ ) Customer customer = bank.getCustomer(i);System.out.println(Customer + (i+1) + is + customer.getLastName()+ , + customer.getFirstName();Java 基础实战Bank 项目实验题目 5：在银行项目中创建 Account。

19、 的两个子类：SavingAccount 和 CheckingAccount实验目的：继承、多态、方法的重写。提 示：创建 Account 类的两个子类：SavingAccount 和 CheckingAccount 子类a. 修改 Account 类；将 balance 属性的访问方式改为 protectedb. 创建 SavingAccount 类，该类继承 Account 类c. 该类必须包含一个类型为 double 的 interestRate 属性d. 该类必须包括带有两个参数(balance 和 interest_rate)的公有构造器。该构 造器必须通过调用 super(bala。

20、nce)将 balance 参数传递给父类构造器。实现 CheckingAccount 类1 CheckingAccount 类必须扩展 Account 类2 该类必须包含一个类型为 double 的 overdraftProtection 属性。3 该类必须包含一个带有参数(balance)的共有构造器。该构造器必须通过调 用 super(balance)将 balance 参数传递给父类构造器。4 给类必须包括另一个带有两个参数(balance 和 protect)的公有构造器。该 构造器必须通过调用 super(balance)并设置 overdragtProtection 属性，将 b。

21、alance 参数传递给父类构造器。5 CheckingAccount 类必须覆盖 withdraw 方法。此方法必须执行下列检查。如 果当前余额足够弥补取款 amount,则正常进行。如果不够弥补但是存在透支 保护，则尝试用 overdraftProtection 得值来弥补该差值(balance-amount). 如果弥补该透支所需要的金额大于当前的保护级别。则整个交易失败，但余 额未受影响。6 在主 exercise1 目录中，编译并执行 TestBanking 程序。输出应为：Creating the customer Jane Smith.Creating her Savings A。

22、ccount with a 500.00 balance and 3% interest.Creating the customer Owen Bryant.Creating his Checking Account with a 500.00 balance and no overdraft protection.Creating the customer Tim Soley.Creating his Checking Account with a 500.00 balance and 500.00 in overdraft protection.Creating the customer 。

23、Maria Soley.Maria shares her Checking Account with her husband Tim.Retrieving the customer Jane Smith with her savings account.Withdraw 150.00: trueDeposit 22.50: trueWithdraw 47.62: trueWithdraw 400.00: falseCustomer Simms, Jane has a balance of 324.88Retrieving the customer Owen Bryant with his ch。

24、ecking account with no overdraft protection.Withdraw 150.00: trueDeposit 22.50: trueWithdraw 47.62: trueWithdraw 400.00: falseCustomer Bryant, Owen has a balance of 324.88Retrieving the customer Tim Soley with his checking account that has overdraft protection.Withdraw 150.00: trueDeposit 22.50: tru。

25、eWithdraw 47.62: trueWithdraw 400.00: trueCustomer Soley, Tim has a balance of 0.0Retrieving the customer Maria Soley with her joint checking account with husband Tim.Deposit 150.00: trueWithdraw 750.00: falseCustomer Soley, Maria has a balance of 150.0/TestBanking 程序/* This class creates the progra。

26、m to test the banking classes.* It creates a new Bank, sets the Customer (with an initial balance),* and performs a series of transactions with the Account object.*/import banking.*;public class TestBanking public static void main(String args) Bank bank = new Bank();Customer customer;Account account。

27、;/ Create bank customers and their accounts/System.out.println(Creating the customer Jane Smith.);bank.addCustomer(Jane, Simms);/codeSystem.out.println(Creating her Savings Account with a 500.00 balance and 3% interest.);/codeSystem.out.println(Creating the customer Owen Bryant.);/codecustomer = ban。

28、k.getCustomer(1);System.out.println(Creating his Checking Account with a 500.00 balance and no overdraft protection.);/codeSystem.out.println(Creating the customer Tim Soley.);bank.addCustomer(Tim, Soley);customer = bank.getCustomer(2);System.out.println(Creating his Checking Account with a 500.00 b。

29、alance and 500.00 in overdraft protection.);/codeSystem.out.println(Creating the customer Maria Soley.);/codecustomer = bank.getCustomer(3);System.out.println(Maria shares her Checking Account with her husband Tim.);customer.setAccount(bank.getCustomer(2).getAccount();System.out.println();/ Demonstr。

30、ate behavior of various account types/ Test a standard Savings AccountSystem.out.println(Retrieving the customer Jane Smith with her savings account.);customer = bank.getCustomer(0);account = customer.getAccount();/ Perform some account transactionsSystem.out.println(Withdraw 150.00: + account.withd。

31、raw(150.00);System.out.println(Deposit 22.50: + account.deposit(22.50);System.out.println(Withdraw 47.62: + account.withdraw(47.62);System.out.println(Withdraw 400.00: + account.withdraw(400.00);/ Print out the final account balanceSystem.out.println(Customer + customer.getLastName()+ , + customer.g。

32、etFirstName()+ has a balance of + account.getBalance();System.out.println();/ Test a Checking Account w/o overdraft protectionSystem.out.println(Retrieving the customer Owen Bryant with his checking account with no overdraft protection.);customer = bank.getCustomer(1);account = customer.getAccount()。

33、;/ Perform some account transactionsSystem.out.println(Withdraw 150.00: + account.withdraw(150.00);System.out.println(Deposit 22.50: + account.deposit(22.50);System.out.println(Withdraw 47.62: + account.withdraw(47.62);System.out.println(Withdraw 400.00: + account.withdraw(400.00);/ Print out the fi。

34、nal account balanceSystem.out.println(Customer + customer.getLastName()+ , + customer.getFirstName()+ has a balance of + account.getBalance();System.out.println();/ Test a Checking Account with overdraft protectionSystem.out.println(Retrieving the customer Tim Soley with his checking account that ha。

35、s overdraft protection.);customer = bank.getCustomer(2);account = customer.getAccount();/ Perform some account transactionsSystem.out.println(Withdraw 150.00: + account.withdraw(150.00);System.out.println(Deposit 22.50: + account.deposit(22.50);System.out.println(Withdraw 47.62: + account.withdraw(4。

36、7.62);System.out.println(Withdraw 400.00: + account.withdraw(400.00);/ Print out the final account balanceSystem.out.println(Customer + customer.getLastName()+ , + customer.getFirstName()+ has a balance of + account.getBalance();System.out.println();/ Test a Checking Account with overdraft protectio。

37、nSystem.out.println(Retrieving the customer Maria Soley with her joint checking account with husband Tim.);customer = bank.getCustomer(3);account = customer.getAccount();/ Perform some account transactionsSystem.out.println(Deposit 150.00: + account.deposit(150.00);System.out.println(Withdraw 750.00。

38、: + account.withdraw(750.00);/ Print out the final account balanceSystem.out.println(Customer + customer.getLastName()+ , + customer.getFirstName()+ has a balance of + account.getBalance();实验题目：5_续1创建客户账户实验目的：instanceof 运算符的应用提示：修改Customer类1 修改Customer类来处理具有多种类型的联合账户。(例如用数组表示多重性一节所作的，该类必须包括以下的公有方法：a。

39、ddAccount(Account)，getAccount(int)和getNumOfAccounts()。每个Customer可以有多个Account。(声明至少有5个)2 完成TestBanking程序该程序创建一个客户和账户的集合，并生成这些客户及其账户余额的报告。在TestBanking.Java文件中，你会发现注释块以/*/来开头和结尾。这些注释只是必须提供的代码的位置。3 使用instanceof操作符测试拥有的账户类型，并且将account_type设置为适当的值，例如：“SavingsAccount”或“CheckingAccount”。4 编译并运行该程序，将看到下列结果CU。

40、STOMERS REPORT=Customer: Simms, JaneSavings Account: current balance is ￥500.00Checking Account: current balance is ￥200.00Customer: Bryant, OwenChecking Account: current balance is ￥200.00Customer: Soley, TimSavings Account: current balance is ￥1,500.00Checking Account: current balance is ￥200.00Cu。

41、stomer: Soley, MariaChecking Account: current balance is ￥200.00Savings Account: current balance is ￥150.00/TestBanking程序/* This class creates the program to test the banking classes.* It creates a set of customers, with a few accounts each,* and generates a report of current account balances.*/impo。

42、rt banking.*;import java.text.NumberFormat;public class TestBanking public static void main(String args) NumberFormat currency_format = NumberFormat.getCurrencyInstance();Bank bank = new Bank();Customer customer;/ Create several customers and their accountsbank.addCustomer(Jane, Simms);customer = ba。

43、nk.getCustomer(0);customer.addAccount(new SavingAccount(500.00, 0.05);customer.addAccount(new CheckingAccount(200.00, 400.00);bank.addCustomer(Owen, Bryant);customer = bank.getCustomer(1);customer.addAccount(new CheckingAccount(200.00);bank.addCustomer(Tim, Soley);customer = bank.getCustomer(2);cust。

44、omer.addAccount(new SavingAccount(1500.00, 0.05);customer.addAccount(new CheckingAccount(200.00);bank.addCustomer(Maria, Soley);customer = bank.getCustomer(3);/ Maria and Tim have a shared checking accountcustomer.addAccount(bank.getCustomer(2).getAccount(1);customer.addAccount(new SavingAccount(150。

45、.00, 0.05);/ Generate a reportSystem.out.println(tttCUSTOMERS REPORT);System.out.println(ttt=);for ( int cust_idx = 0; cust_idx bank.getNumOfCustomers(); cust_idx+ ) customer = bank.getCustomer(cust_idx);System.out.println();System.out.println(Customer: + customer.getLastName() + , + customer.getFir。

46、stName();for ( int acct_idx = 0; acct_idx customer.getNumOfAccounts(); acct_idx+ ) Account account = customer.getAccount(acct_idx);String account_type = ;/ Determine the account type/* Step 1:* Use the instanceof operator to test what type of account* we have and set account_type to an appropriate v。

47、alue, such* as Savings Account or Checking Account.*/ Print the current balance of the account/* Step 2:* Print out the type of account and the balance.* Feel free to use the currency_format formatter* to generate a currency string for the balance.*/实验题目：5_续2实现更为复杂的透支保护机制注释-这是练习1的选择练习。它包括了更为复杂的透支保护机。

48、制模型。它使用客户储蓄。它使用客户储蓄账户完成透支保护。本练习必须在完成上述两个练习后进行。实验目的：继承、多态、方法的重写。说明：修改SavingAccount类1.仿照练习1“Account类的两个子类”一节实现SavingsAccount类。2.SavingAccount类必须扩展Account类。3.该类必须包含一个类型为double的interestRate属性4.该类必须包括一个带有两个参数(balance和interest_rate)的公有构造器。该构造器必须通过调用super(balance)来将balance参数传递给父类构造器修改CheckingAccount类1.仿照练习。

49、1“Account类的两个子类”一节实现CheckingAccount类。2.CheckingAccount类必须扩展Account类3.该类必须包括一个关联属性，称作protectedBy，表示透支保护。该属性的类型为SavingAccount，缺省值必须是null。除此之外该类没有其他的数据属性。4.该类必须包括一个带有参数(balance)的公有构造器，该构造器必须通过调用super(balance)将balance参数传递到父类构造器。5.修改构造器为CheckingAccount(double balance,SavingAccount protect)构造器。该构造器必须通过调用s。

50、uper(balance)将balance参数传递给父类构造器。6. CheckingAccount类必须覆盖withdraw方法。该类必须执行下面的检查：如果当前余额足够弥补取款amount，则正常进行。如果不够弥补但是存在透支保护则尝试用储蓄账户来弥补这个差值(balance-amount)。如果后一个交易失败，则整个交易一定失败，但余额未受影响。修改Customer类，使其拥有两个账户：一个储蓄账户和一个支票账户：两个都是可选的。1.在练习5_续1修改，原来的Customer类包含一个称作account的关联属性，可用该属性控制一个Account对象。重写这个类，使其包含两个关联属性：s。

51、avingAccount和checkingAccount，这两个属性的缺省值是null2.包含两个访问方法：getSaving和getChecking，这两个方法分别返回储蓄和支票总数。3. 包含两个相反的方法：SetSaving和setChecking，这两个方法分别为savingAccount和checkingAccount这两个关联属性赋值。完成TestBanking程序Customer Simms, Jane has a checking balance of 200.0 and a savings balance of500.0Checking Acct Jane Simms : w。

52、ithdraw 150.00 succeeds? trueChecking Acct Jane Simms : deposit 22.50 succeeds? trueChecking Acct Jane Simms : withdraw 147.62 succeeds? trueCustomer Simms, Jane has a checking balance of 0.0 and a savings balance of 424.88Customer Bryant, Owen has a checking balance of 200.0Checking Acct Owen Bryan。

53、t : withdraw 100.00 succeeds? trueChecking Acct Owen Bryant : deposit 25.00 succeeds? trueChecking Acct Owen Bryant : withdraw 175.00 succeeds? falseCustomer Bryant, Owen has a checking balance of 125.0/TestBanking程序/* This class creates the program to test the banking classes.* It creates a new Ban。

54、k, sets the Customer (with an initial balance),* and performs a series of transactions with the Account object.*/import banking.*;public class TestBanking public static void main(String args) Bank bank = new Bank();Customer customer;Account account;/ Create two customers and their accountsbank.addCu。

55、stomer(Jane, Simms);customer = bank.getCustomer(0);account = customer.getChecking();customer.setSavings(new SavingsAccount(500.00, 0.05);customer.setChecking(new CheckingAccount(200.00, customer.getSavings();bank.addCustomer(Owen, Bryant);customer = bank.getCustomer(1);customer.setChecking(new Check。

56、ingAccount(200.00);/ Test the checking account of Jane Simms (with overdraft protection)customer = bank.getCustomer(0);System.out.println(Customer + customer.getLastName()+ , + customer.getFirstName() + + has a checking balance of + customer.getChecking().getBalance()+ and a savings balance of + customer.getSavings().getBalance();System.out.println(Checking Acct Jane Simms : withdraw 150.00 succeeds? + account.withdraw(150.00);System.out.println(Checking Acct Jane Simms : deposit 22.50 succeeds? + account.deposit(22.5。