11.8 新的Account类
先补充9.7的Account类：
代码：
public class Exercise09_07 {
public static void main(String[] args) {
//创建一个账户对象
Account account = new Account(1122,20000);
account.setAnnualInterestRate(4.5);
//使用withdraw取款
account.withDraw(2500);
//存款
account.deposit(3000);
//打印
System.out.println("Balance is "+account.getBalance());
System.out.println("Monthly interest is "+account.getMonthlyInterest());
System.out.println("This account was created at "
+account.getDateCreated());
}
}
class Account{
private int id;
private double balance;
private double annualInterestRate=0;
private java.util.Date dateCreated;//注意此处要使用Date的包
//创建默认账户的无参构造方法，名字和类一样
public Account(){
dateCreated = new java.util.Date();
}
//带参构造方法
public Account(int id,double balance){
this.id = id;
this.balance =balance;//余额
dateCreated = new java.util.Date();
}
//访问器和修改器get和set
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;
}
//dateCreated的访问器
public java.util.Date getDateCreated() {
return dateCreated;
}
//返回月利率
public double getMonthlyInterest() {
return balance*(annualInterestRate/1200);
}
//withDraw从账户提取特定数额
public void withDraw(double amount) {
balance-=amount;
}
//deposit向账户存储特定数额
public void deposit(double amount) {
balance +=amount;
}
}
11.8题目要求：
代码：
public class Exercise11_08 {
public static void main(String[] args) {
//创建一个账户对象
Account account = new Account("George",1122,20000);
account.setAnnualInterestRate(5.5);
//存款
account.deposit(30);
account.deposit(40);
account.deposit(50);
//使用withdraw取款
account.withDraw(5);
account.withDraw(4);
account.withDraw(2);
//打印
System.out.println("Name "+account.getName());
System.out.println("Annual interest rate: "+account.getAnnualInterestRate());
System.out.println("Balance is "+account.getBalance());
java.util.ArrayList list = account.getTransactions();
//打印清单
System.out.printf("%-35s%-15s%-15s%-15s\n","Date","Type","Account","Balance");
for(int i=0;i<list.size();i++) {
Transaction transaction = (Transaction)(list.get(i));
System.out.printf("%-35s%-15s%-15s%-15s\n",transaction.getDate(),
transaction.getType(),transaction.getAmount(),transaction.getBalance());
}
}
}
class Account{
private int id;
//新加的名字数据
private String name;
private double balance;
private double annualInterestRate=0;
private java.util.Date dateCreated;
//新加的transactions用于为账户存储交易
private java.util.ArrayList transactions = new java.util.ArrayList();
public java.util.ArrayList getTransactions() {
return transactions;
}
public void setTransactions(java.util.ArrayList transactions) {
this.transactions = transactions;
}
//创建默认账户的无参构造方法，名字和类一样
public Account(){
dateCreated = new java.util.Date();
}
//带参构造方法
public Account(String name,int id,double balance){
this.id = id;
this.name = name;
this.balance =balance;//余额
dateCreated = new java.util.Date();
}
//访问器和修改器get和set
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
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;
}
//dateCreated的访问器
public java.util.Date getDateCreated() {
return dateCreated;
}
//返回月利率
public double getMonthlyInterest() {
return balance*(annualInterestRate/1200);
}
//withDraw从账户提取特定数额
public void withDraw(double amount) {
balance-=amount;
transactions.add(new Transaction('W',amount,balance," "));
}
//deposit向账户存储特定数额
public void deposit(double amount) {
balance +=amount;
transactions.add(new Transaction('D',amount,balance," "));
}
}
class Transaction{
private java.util.Date date;
private char type;
private double amount;
private double balance;
private String description;
public Transaction(char Type,double amount,double balance,String description) {
date = new java.util.Date();
this.type =type;
this.balance = balance;
this.description = description;
}
public java.util.Date getDate() {
return date;
}
public char getType() {
return type;
}
public double getAmount() {
return amount;
}
public double getBalance() {
return balance;
}
public String getDescription() {
return description;
}
}