##Java 类和对象的实验
一 实验内容
1、设计一个名为Account的类，它包括：
（1）一个名为id的int类型私有账户数据域（默认值为0）；
（2）一个名为balance的double类型私有账户数据域（默认值为0）；
（3）一个名为annualInterestRate的double类型私有数据域存储当前利率（默认值为0）。假设所有的账户都有相同的利率。
（4）一个名为dateCreate的Date类型私有数据域存储账户的开户日期；
（5）一个能创建默认账户的无参构造方法；
（6）一个能创建带特定id和初始余额的账户的构造方法；
（7）id、balance和annualInterestRate的访问器和修改器；
（8）dateCreated的访问器；
（9）一个名为getMonthInterestRate()的方法返回月利率；
（10）一个名为withDraw的方法从账户提取特定数额；
（11）一个名为deposit的方法向账户存储特定数额；
画出该类的UML图，实现这个类，编写一个测试程序，创建一个账户ID为1122、余额为20000元，年利率为5%的Account对象，使用withDraw方法取款3000元，使用deposit方法存款5000元，然后打印余额、月利息以及这个账户的开户日期。
2、定义一个Account类来建模一个银行账户。一个账户有账号、余额、年利率、开户日期等属性，以及存款和取款等方法，创建两个检测支票账户（checking account）和储蓄账户（saving account）的子类，支票账户有个透支限定额，但储蓄账户不能透支。
画出这些类的UML图，实现这些类，编写一个测试程序，创建Account、SavingAccount和CheckingAccount的对象，然后调用它们的toString()方法。
3、根据要求设计一个新的Account类：
（1）添加一个String类型的新数据name类存储客户的名字；
（2）添加一个新的构造方法，该方法创建一个带指定名字、id和收支额的账户；
（3）添加一个名为transactions的新数据域，它的类型是ArrayList，可以为账户存储交易，每笔交易都是一个Transaction类的实例，Transaction类的定义如下图所示。
（4）修改withdraw和deposit方法，向transactions数组线性表添加一笔交易。
（5）其它所有属性和方法都和练习题2一样。
编写一个测试程序，创建一个年利率为1.5%、收支额为10000、id为1122而名字为江山的Account。向该账户存入500元、1000元和5000元并从该账户中取出100元、2000元和3000元。打印账户清单，显示账户持有者名字、利率、收支额和所有交易。
Transaction类描述银行账户的一笔交易
4、利用上述的Account类，模拟一台ATM机。创建一个有10个账户的数组，其id为0,1，…,9，并初始化收支为100元人民币，系统提示用户输入一个id，如果输入的id不正确，提示用户输入正确的id，一旦接受一个id，就显示下图所示的主菜单，可以选择1来查看当前的收支，选择2表示取钱，选择3表示存钱，选择4表示退出主菜单。一旦退出，系统就会提示再次输入id。因此系统一旦启动就不会停止。
画出类的UML图，实现这个类，编写一个测试程序完成上述功能。
Enter an id: 3
Main menu
1: check balance
2: withdraw
3: deposit
4: exit
Enter a choice: 1
The balance is 100.0Main menu
1: check balance
2: withdraw
3: deposit
4: exit
Enter a choice: 2
Enter an amount to withdraw: 1000
The amount is too large, ignored
Main menu
1: check balance
2: withdraw
3: deposit
4: exit
Enter a choice: 2
Enter an amount to withdraw: 30Main menu
1: check balance
2: withdraw
3: deposit
4: exit
Enter a choice: 3
Enter an amount to deposit: 12Main menu
1: check balance
2: withdraw
3: deposit
4: exit
Enter a choice: 4
Enter an id: 3import java.util.Date;
public class Account {
protected int id;//账户数据域
protected double balance=0;//账户余额数据域
protected double annualInterestRate=0;//数据域存储当前率,假设每个账户都有相同的利率
protected Date dateCreate;//开户日期
public Account()//创建默认账户的无参构造
{
super();
this.dateCreate=new Date();
}
protected Account(int id,double balance) {
this.id = id;
this.balance = balance;
dateCreate = new Date();
}
protected Account(int id,double balance,double annualIntegerRate) {
this(id,balance);
dateCreate = new Date();
this.annualInterestRate = annualIntegerRate;
}
//账户，余额，利率访问器和修改器
public int getId()
{
return id;
}
public void setId(int id)
{
this.id=id;
}
public double getBalance()
{
return balance;
}
public void setBalance(double balancce)
{
this.balance=balance;
}
public double getAnnualInterestRate()
{
return annualInterestRate;
}
public void setAnnualInterestRate(double annualInterestRate)
{
this.annualInterestRate=annualInterestRate;
}
//访问器和修改器结束
//开户日期访问器
public Date getDateCreate()
{
return dateCreate;
}
public void setDateCreate(Date dateCreate)
{
this.dateCreate=dateCreate;
}
public double getMonthInterRate()
{
return annualInterestRate;
}
public void withDraw(double Decreasemoney)//取钱
{
if(Decreasemoney>balance)
{
System.out.println("您的账户余额不足！");
}
else
this.balance-=Decreasemoney;
}
public void deposit(double Increasemoney)//存钱
{
this.balance+=Increasemoney;
}
}
public class Checking_account extends Account {//支票账户,有透支限定额
public Checking_account() {
}
public Checking_account(int id,double balance) {
super(id,balance);
}
public Checking_account(int id,double balance,double annualInterestRate)
{
super(id,balance,annualInterestRate);
}
public String toString() {
return "Account typte：CheckingAccount\n"+super.toString();
}
}
public class Saving_account extends Account {//储蓄账户,不能透支
public Saving_account() {
}
public Saving_account(int id,double balance) {
super(id,balance);
}
public Saving_account(int id,double balance,double annualIntegerRate) {
super(id,balance,annualIntegerRate);
}
protected void withDaraw(double withDarawBalance) {
if(balance-withDarawBalance<0) {
System.out.println("账户余额不足！余额为："+getBalance());
}
else {
balance = balance - withDarawBalance;
}
}
public String toString() {
return "Account typte：SavingAccount\n"+super.toString();
}
}
package tu;
public class Test_Account {
public static void main(String args[])
{
int id1 = 1122;
int id2 = 2211;
double balance = 10000;
double annualInterestRate = 0.0025;
System.out.println("*****************************************Checking_account*************************************\n");
Checking_account check1 = new Checking_account();
Checking_account check2 = new Checking_account(id1,balance);
Checking_account check3 = new Checking_account(id2,balance,annualInterestRate);
System.out.println("---------------------Check1---------------------\n");
System.out.println(check1.getDateCreate());
System.out.println(check1.getId());
System.out.println(check1.getBalance());
System.out.println(check1.getAnnualInterestRate());
double depositBalance = 1000;
check1.deposit(depositBalance);
System.out.println(check1.getBalance());
double withDarawBalance = 1000;
check1.withDraw(withDarawBalance);
System.out.println(check1.getBalance());
System.out.println();
System.out.println(check1.toString());
System.out.println("---------------------Check2---------------------\n");
System.out.println(check2.getDateCreate());
System.out.println(check2.getId());
System.out.println(check2.getBalance());
System.out.println(check2.getAnnualInterestRate());
check2.deposit(depositBalance);
System.out.println(check2.getBalance());
check2.withDraw(withDarawBalance);
System.out.println(check2.getBalance());
System.out.println();
System.out.println(check2.toString());
System.out.println("---------------------Check3---------------------\n");
System.out.println(check3.getDateCreate());
System.out.println(check3.getId());
System.out.println(check3.getBalance());
System.out.println(check3.getAnnualInterestRate());
check3.deposit(depositBalance);
System.out.println(check2.getBalance());
check3.withDraw(withDarawBalance);
System.out.println(check3.getBalance());
System.out.println();
System.out.println(check3.toString());
System.out.println("---------------------Check3---------------------\n");
System.out.println(check3.getDateCreate());
System.out.println(check3.getId());
System.out.println(check3.getBalance());
System.out.println(check3.getAnnualInterestRate());
check3.deposit(depositBalance);
System.out.println(check2.getBalance());
check3.withDraw(200000);
System.out.println(check3.getBalance());
System.out.println();
System.out.println(check3.toString());
System.out.println("*****************************************Saving_account*************************************");
Saving_account saving1 = new Saving_account();
Saving_account saving2 = new Saving_account(id1,balance);
Saving_account saving3 = new Saving_account(id2,balance,annualInterestRate);
System.out.println("---------------------saving1---------------------\n");
System.out.println(saving1.getDateCreate());
System.out.println(saving1.getId());
System.out.println(saving1.getBalance());
System.out.println(saving1.getAnnualInterestRate());
saving1.deposit(depositBalance);
System.out.println(check1.getBalance());
saving1.withDaraw(withDarawBalance);
System.out.println(saving1.getBalance());
System.out.println();
System.out.println(saving1.toString());
System.out.println("---------------------saving2---------------------\n");
System.out.println(saving2.getDateCreate());
System.out.println(saving2.getId());
System.out.println(saving2.getBalance());
System.out.println(saving2.getAnnualInterestRate());
saving2.deposit(depositBalance);
System.out.println(check2.getBalance());
saving2.withDraw(withDarawBalance);
System.out.println(saving2.getBalance());
System.out.println();
System.out.println(saving2.toString());
System.out.println("---------------------saving3---------------------\n");
System.out.println(saving3.getDateCreate());
System.out.println(saving3.getId());
System.out.println(saving3.getBalance());
System.out.println(saving3.getAnnualInterestRate());
saving3.deposit(depositBalance);
System.out.println(saving3.getBalance());
saving3.withDraw(withDarawBalance);
System.out.println(saving3.getBalance());
System.out.println();
System.out.println(saving3.toString());
System.out.println("---------------------saving4---------------------\n");
System.out.println(saving1.getDateCreate());
System.out.println(saving1.getId());
System.out.println(saving1.getBalance());
System.out.println(saving1.getAnnualInterestRate());
saving1.deposit(depositBalance);
System.out.println(check1.getBalance());
saving1.withDraw(20000);
System.out.println(saving1.getBalance());
System.out.println();
System.out.println(saving1.toString());
}
}
3.
public class Account {
private String name;
private int id;
private double balance;
private double annualInterestRate;
private Date dateCreate=new Date();
public List<Integer> transactions=new ArrayList<Integer>();
public Account() {
;
}
public Account(String name,int id,double balance)
{
this.name=name;
this.id=id;
this.balance=balance;
}
public double getMonthInterestRate()
{
return balance*annualInterestRate/12;
}
public void withDraw(int money) {
transactions.add(-money);
this.balance-=money;
}
public void deposit(int money) {
transactions.add(money);
this.balance+=money;
}
public int getId() {
return id;
}
public void setId(int id) {
this.id = id;
}
public double getBalance() {
return balance;
}
public void setBalance(double balance) {
this.balance = balance;
}
public double getAnnualInterestRate() {
return annualInterestRate;
}
public void setAnnualInterestRate(double annualInterestRate) {
this.annualInterestRate = annualInterestRate;
}
public Date getDateCreate() {
return dateCreate;
}
class checkingAccount{
checkingAccount(int money)
{
balance-=money;
}
@Override
public String toString() {
return "checkingAccount [toString()=" + "可以透支限额度" + "]";
}
}
class savingAccount{
savingAccount(int money)
{
if(money>balance)
System.out.println("透支银行账户余额");
else
balance-=money;
}
@Override
public String toString() {
return "savingAccount [toString()=" +" 不可以透支限额度 "+ "]";
}
}
public static void main(String[] args) {
Account people=new Account("江山",1122,10000);
people.setAnnualInterestRate(1.5*0.01);
people.deposit(500);
people.deposit(1000);
people.deposit(5000);
people.withDraw(100);
people.withDraw(2000);
people.withDraw(3000);
SimpleDateFormat sdf = new SimpleDateFormat();// 格式化时间
sdf.applyPattern("yyyy-MM-dd HH:mm:ss a");// a为am/pm的标记
System.out.println("名字:"+people.name+" id:"+people.id);
System.out.println("余额 "+people.getBalance()+"月利息 "+people.getMonthInterestRate()
+"开户日期 "+sdf.format(people.getDateCreate()));
for(Integer money:people.transactions)
{
int i=1;
System.out.println("第"+i+"笔交的交易金额为:"+money);
i++;
}
}
}
4.
public class Account {
private int id;
private double balance;
private double annualInterestRate;
private Date dateCreate=new Date();
public List<Integer> transactions=new ArrayList<Integer>();
public Account() {
;
}
public Account(int id,double balance)
{
this.id=id;
this.balance=balance;
}
public double getMonthInterestRate()
{
return balance*annualInterestRate/12;
}
public void withDraw(int money) {
transactions.add(-money);
this.balance-=money;
}
public void deposit(int money) {
transactions.add(money);
this.balance+=money;
}
public int getId() {
return id;
}
public void setId(int id) {
this.id = id;
}
public double getBalance() {
return balance;
}
public void setBalance(double balance) {
this.balance = balance;
}
public double getAnnualInterestRate() {
return annualInterestRate;
}
public void setAnnualInterestRate(double annualInterestRate) {
this.annualInterestRate = annualInterestRate;
}
public Date getDateCreate() {
return dateCreate;
}
class checkingAccount{
checkingAccount(int money)
{
balance-=money;
}
@Override
public String toString() {
return "checkingAccount [toString()=" + "可以透支限额度" + "]";
}
}
class savingAccount{
savingAccount(int money)
{
if(money>balance)
System.out.println("透支银行账户余额");
else
balance-=money;
}
@Override
public String toString() {
return "savingAccount [toString()=" +" 不可以透支限额度 "+ "]";
}
}
public static void main(String[] args) {
Scanner input=new Scanner(System.in);
List<Account> list=new ArrayList<Account>();
for(int i=0;i<=9;i++)
{
list.add(new Account(i,100));
}
System.out.println("请输入你要选择的id:");
int id=input.nextInt();
while(true) {
System.out.println("Main menu\r\n" +
"1: check balance\r\n" +
"2: withdraw\r\n" +
"3: deposit\r\n" +
"4: exit\r\n" +
"Enter a choice: ");
int n=input.nextInt();
if(n==1)
{
System.out.println("账户余额"+list.get(id).balance);
}
if(n==2)
{
System.out.println("请输入你要取出的钱:");
int money=input.nextInt();
if(money>list.get(id).balance)
System.out.println("超过最大余额");
else
list.get(id).withDraw(money);
}
if(n==3)
{
System.out.println("请输入你要存入的钱:");
int money=input.nextInt();
list.get(id).deposit(money);
}
if(n==4)break;
}
}
}运行结果截图：
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