Java帐户类计划

Question

这个程序我写了一遍又一遍，能不能有人告诉我，我错过了什么，它看起来是一个小错误，我没有抓住。

以下是我正在努力完成的：

设计一个名为Account的类,该类包含：

• 名为id的帐户专用int数据字段（默认值0)
• 帐户的名为balance的私有双数据字段（默认值为0)
• 一个名为annualInterestRate的私有双数据字段，用于存储当前利率（默认值为0）。假设所有账户的利率相同。
• 名为dateCreated的专用日期数据字段，用于存储创建帐户的日期。创建默认帐户的无参数构造函数。
• 使用特定id和初始余额创建帐户的构造函数。
• id、balance和AnnualInterestRate的访问器和赋值器方法。
• dateCreated的访问器方法
• 一个名为getMonthlyInterestRate（）的方法，它返回月利率。
• 从帐户中提取指定金额的方法名为revact，将指定金额存入帐户的方法名为revact，将指定金额存入帐户的方法名为revact，将指定金额存入帐户。
• 编写一个测试程序，创建一个帐户ID为1122、余额为20,000美元、年利率为4.5%的帐户对象。使用提取方法提取2,500美元，使用存款方法存款3,000美元，并打印余额、月息和创建此帐户的日期。

以下是我目前掌握的情况：

import java.util.Date;

public class Assign22 {

public static void main(String[] args) {
    // TODO Auto-generated method stub

Account account1 = new Account(1122, 20000, .045);
account1.withdraw(2500);
account1.deposit(3000);
System.out.println("Date Created:" + java.util.Date dateCreated = new java.util.Date());
System.out.println("Account ID:" + account1.id);
System.out.println("Balance:" + account1.getBalance());
System.out.println("Interest Rate:" + account1.getAnnualInterestRate());
System.out.println("Balance after withdraw of 2500:" +       account1.getAnnualInterestRate());
System.out.println("Balance after deposit of 3000:" + account1.getAnnualInterestRate());
System.out.println("Monthly Interest:" + account1.id);

System.out.println("Process completed.");
}

class Account {
//define variables
private int id;
private double balance; // balance for account
private double annualInterestRate; //stores the current interest rate
private Date dateCreated; //stores the date account created

//no arg construtor
Account () {
    id = 0;
    balance = 0.0;
    annualInterestRate = 0.0;
}
//constructor with specific id and initial balance
Account(int newId, double newBalance) {
    id = newId;
    balance = newBalance;
}
Account(int newId, double newBalance, double newAnnualInterestRate) {
    id = newId;
    balance = newBalance;
    annualInterestRate = newAnnualInterestRate;
}
//accessor/mutator methods for id, balance, and annualInterestRate
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;
}
//accessor method for dateCreated
public void setDateCreated(Date newDateCreated) {
    dateCreated = newDateCreated;
}
//define method getMonthlyInterestRate
double getMonthlyInterestRate() {
    return annualInterestRate/12;
}
//define method withdraw
double withdraw(double amount) {
    return balance -= amount;
}   
//define method deposit
double deposit(double amount) {
    return balance += amount;   
}
}

}

这是我收到的错误：不确定我错过了什么：

无法将此令牌dateCreated之后预期的令牌“date”的语法错误解析为Assign22.Main处的变量(Assign22.:12）

Answer 1

不能将变量声明作为string级联表达式的一部分

System.out.println("Date Created:" + java.util.Date dateCreated = new java.util.Date());

把它分开

java.util.Date dateCreated = new java.util.Date()
System.out.println("Date Created:" + dateCreated);