自带测试类
源代码：

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package testaccount;
public class TestAccount{
public static void main(String args[]){
Account ss=new Account(1122,20000);
ss.setannualInterestRate(4.5);
ss.withDraw(2500);
ss.deposit(3000);
System.out.println("The ss's id is "+ ss.getid());
System.out.println("The ss's balance is "+ ss.getbalance());
System.out.println("The ss's dateCreated is "+ ss.getdateCreated());
}
}

class Account{
private int id=0;
private double balance=0;
private double annualInterestRate=0;
private java.util.Date dateCreated=new java.util.Date();
public Account(){
}
public Account(int newid,int newbalance){
id=newid;
balance=newbalance;
}
public int getid(){
return id;
}
public double getbalance(){
return balance;
}
public double getannualInterestRate(){
return annualInterestRate;
}
public void setid(int newid){
id=newid;
}
public void setbalance(double newbalance){
balance=newbalance;
}
public void setannualInterestRate(double newannualInterestRate){
annualInterestRate=newannualInterestRate;
}
public double getMonthlyInterest(){
return (annualInterestRate/12)/100;
}
public String getdateCreated(){
return dateCreated.toString();
}
public void withDraw(double draw){
balance-=draw;
}
public void deposit(double draw){
balance+=draw;
}
}

运行结果：

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