天津理工大学Java实验3实验报告

天津理工大学

计算机科学与工程学院

实验报告

2016 至2017 学年第一学期

三、实验分析总结

本次实验中，主要练习编译了跟抽象类有关的相关程序。其中主要包括已知抽象方法编写抽象类、抽象类抽象方法实现多态性、通过定义多个子类来实现对类的继承。通过本次实验，基本掌握了实现多态的方法，也练习了抽象类和抽象方法的定义和使用。以后也还需要多加练习，能更加熟悉。同时，编写程序中遇到问题再所难免，应耐心探究其中的原因，从出现问题的地方起，并联系前后程序，仔细推敲，逐个排查。直到最终搞清为止。

package ex3;

public abstract class Account

{

protected double balance;

public Account(double d)

{

this.balance=d;

}

public double getBalance()

{

return this.balance;

}

public void setBalance(double newBalance)

{

this.balance=newBalance;

}

protected void deposit(double amount)

{

this.balance+=amount;

}

protected void withdraw(double amount) throws OverdraftException {

if(balance

{

throw new OverdraftException("取款超过余额");

}

this.balance-=amount;

}

}

package ex3;

import java.util.*;

public class BANK

{

List customers=new ArrayList();

public BANK()

{}

public void addCustomer(String first,String last)

{

CUSTOMER cstm=new CUSTOMER(first,last);

customers.add(cstm);

}

public CUSTOMER getCustomer(int i)

{

List list=new ArrayList();

Iterator it=customers.iterator();

while(it.hasNext())

{

CUSTOMER temp=it.next();

list.add(temp);

}

return list.get(i-1);

}

public int getNumOfCustomers()

{

List list=new ArrayList();

Iterator it=customers.iterator();

while(it.hasNext())

{

CUSTOMER temp=it.next();

list.add(temp);

}

return list.size();

}

public Iterator getCustomers()

{

Iterator it=customers.iterator();

return it;

}

}

package ex3;

public class CHECACCOUNT extends Account

{

public CHECACCOUNT(double bal)

{

super(bal);

canOverdraft=false;

maxOverdraft=0.00;

}

public CHECACCOUNT(double bal,boolean initcan,double initmax) {

super(bal);

canOverdraft=initcan;

maxOverdraft=initmax;

}

protected boolean canOverdraft;

protected double maxOverdraft;

protected void deposit(double amount)

{

this.balance+=amount;

}

public void withdraw(double amount) throws OverdraftException

{

if(balance

throw new OverdraftException("不允许透支！");

}

if(canOverdraft==true && maxOverdraft<(amount-balance))

{

throw new OverdraftException("超过透支限额！");

}

balance-=amount;

if(balance<0)

{

maxOverdraft+=balance;

}

}

}

package ex3;

import java.util.*;

public class CUSTOMER

{

String firstName;

String lastName;

List accounts=new ArrayList();

public CUSTOMER(String first,String last)

{

this.firstName=first;

https://www.360docs.net/doc/5616508752.html,stName=last;

}

String getName()

{

return https://www.360docs.net/doc/5616508752.html,stName+" "+this.firstName;

}

public void addAccount(Account acc)

{

accounts.add(acc);

}

public Account getAccount(int i){

List list=new ArrayList();

Iterator it=accounts.iterator();

while(it.hasNext()){

Account temp=it.next();

list.add(temp);

}

return list.get(i-1);

}

public int getNumOfAccounts()

{

List list=new ArrayList();

Iterator it=accounts.iterator();

while(it.hasNext()){

Account temp=it.next();

list.add(temp);

}

return list.size();

}

public Iterator getAccounts()

{

Iterator it=accounts.iterator();

return it;

}

}

package ex3;

public class CUSTOMERREPORT {

public CUSTOMERREPORT(){}

public void generateReport(BANK bank)

{

System.out.println("CUSTOMERS REPORT");

System.out.println("==================");

System.out.println("储户姓名："+bank.getCustomer(1).getName());

System.out.println("Savings Account：当前余额是

￥"+bank.getCustomer(1).getAccount(1).getBalance());

System.out.println("Checking Account：当前余额是

￥"+bank.getCustomer(1).getAccount(2).getBalance());

System.out.println();

System.out.println("储户姓名："+bank.getCustomer(2).getName());

System.out.println("Checking Account：当前余额是

￥"+bank.getCustomer(2).getAccount(1).getBalance());

System.out.println();

System.out.println("储户姓名："+bank.getCustomer(3).getName());

System.out.println("Savings Account：当前余额是

￥"+bank.getCustomer(3).getAccount(1).getBalance());

System.out.println("Checking Account：当前余额是

￥"+bank.getCustomer(3).getAccount(2).getBalance());

System.out.println();

System.out.println("储户姓名："+bank.getCustomer(4).getName());

System.out.println("Savings Account：当前余额是

￥"+bank.getCustomer(4).getAccount(1).getBalance());

System.out.println("Checking Account：当前余额是

￥"+bank.getCustomer(4).getAccount(2).getBalance());

}

}

package ex3;

public class OverdraftException extends Exception

{

private static final long serialVersionUID = 1L;

public OverdraftException()

{

super();

}

public OverdraftException(String msg)

{

super(msg);

}

}

package ex3;

public class SA VING extends Account

{

double interestRate;

public SA VING(double d, double e)

{

super(d);

this.interestRate=e;

}

}

package ex3;

public class TESTMAIN

{

public static void main(String[] args)

{

BANK bank=new BANK();

bank.addCustomer("Simms", "Jane");

bank.addCustomer("Bryant", "Owen");

bank.addCustomer("Soley", "Tim");

bank.addCustomer("Soley", "Maria");

SA VING saving=new SA VING(500.00,0.05);

CHECACCOUNT checking=new CHECACCOUNT (200.00, true, 400.00);

bank.getCustomer(1).addAccount(saving);

bank.getCustomer(1).addAccount(checking);

checking=new CHECACCOUNT (200.00);

bank.getCustomer(2).addAccount(checking);

saving=new SA VING(1500.00, 0.05);

checking=new CHECACCOUNT (200.00, true, 400.00);

bank.getCustomer(3).addAccount(saving);

计算机科学与工程系

bank.getCustomer(3).addAccount(checking);

saving=new SA VING(150.00, 0.05);

bank.getCustomer(4).addAccount(saving);

bank.getCustomer(4).addAccount(checking);

CUSTOMERREPORT cr=new CUSTOMERREPORT();

cr.generateReport(bank);

}

}