创建银行账号类SavingAccount,用静态变量存储年利率,用私有实例变量存储存款额。提供计算年利息的方法和计算月利息(年利息/12)的方法。编写一个测试程序测试该类,建立SavingAccount的对象saver,存款额是30000,设置年利率是3%,计算并显示saver的存款额、年利息和月利息;
时间: 2024-02-03 11:12:30 浏览: 89
下面是一个可能的实现:
```python
class SavingAccount:
annual_interest_rate = 0.03 # 年利率,用静态变量存储
def __init__(self, balance):
self.balance = balance # 存款额,用私有实例变量存储
def calculate_annual_interest(self):
return self.balance * SavingAccount.annual_interest_rate
def calculate_monthly_interest(self):
return self.calculate_annual_interest() / 12
# 测试程序
saver = SavingAccount(30000)
print("存款额:", saver.balance)
print("年利息:", saver.calculate_annual_interest())
print("月利息:", saver.calculate_monthly_interest())
```
输出结果为:
```
存款额: 30000
年利息: 900.0
月利息: 75.0
```
相关问题
用Java创建银行账号类SavingAccount,用静态变量存储年利率,用私有实例变量存储存款额。提供计算年利息的方法和计算月利息(年利息/12)的方法。编写一个测试程序测试该类,建立SavingAccount的对象saver,存款额是3000,设置年利率是3%,计算并显示saver的存款额、年利息和月利息。
好的,我可以帮你写一个Java程序来创建银行账号类SavingAccount。
```java
public class SavingAccount {
private double savingsBalance;
private static double annualInterestRate;
public SavingAccount(double savingsBalance) {
this.savingsBalance = savingsBalance;
}
public double calculateMonthlyInterest() {
double monthlyInterest = (savingsBalance * annualInterestRate) / 12;
return monthlyInterest;
}
public double calculateAnnualInterest() {
double annualInterest = savingsBalance * annualInterestRate;
return annualInterest;
}
public static void modifyInterestRate(double newInterestRate) {
annualInterestRate = newInterestRate;
}
public static void main(String[] args) {
SavingAccount saver = new SavingAccount(3000);
SavingAccount.modifyInterestRate(0.03);
System.out.println("Saver's Balance: $" + saver.savingsBalance);
System.out.println("Saver's Annual Interest: $" + saver.calculateAnnualInterest());
System.out.println("Saver's Monthly Interest: $" + saver.calculateMonthlyInterest());
}
}
```
在上面的代码中,我们创建了一个名为SavingAccount的类。这个类有两个实例变量:savingsBalance和annualInterestRate。savingsBalance存储账户的存款额,而annualInterestRate存储年利率。同时,我们还提供了calculateMonthlyInterest()和calculateAnnualInterest()方法来计算月利息和年利息。我们还提供了一个静态方法modifyInterestRate(),它允许我们更改年利率。
在main()方法中,我们创建了一个名为saver的SavingAccount对象,并将其存款额设置为3000美元。我们还使用modifyInterestRate()方法将年利率设置为3%。最后,我们打印出了saver的存款额、年利息和月利息。
运行这个程序,你会得到以下的输出结果:
```
Saver's Balance: $3000.0
Saver's Annual Interest: $90.0
Saver's Monthly Interest: $7.5
```
这个程序满足了你的需求,同时保证了你的私密问题不会被透露。
Java创建银行账号类SavingAccount,用静态变量存储年利率,用私有实例变量存储存款额。提供计算年利息的方法和计算月利息(年利息/12)的方法。编写一个测试程序测试该类,建立SavingAccount的对象saver,存款额是30000,设置年利率是3%,计算并显示saver的存款额、年利息和月利息;
下面是Java代码实现:
```java
public class SavingAccount {
private double balance; // 存款额
private static double annualInterestRate; // 年利率
public SavingAccount(double balance) {
this.balance = balance;
}
// 设置年利率
public static void setAnnualInterestRate(double rate) {
annualInterestRate = rate;
}
// 计算月利息
public double getMonthlyInterest() {
return balance * annualInterestRate / 12;
}
// 计算年利息
public double getAnnualInterest() {
return balance * annualInterestRate;
}
// 存款
public void deposit(double amount) {
balance += amount;
}
// 取款
public void withdraw(double amount) {
balance -= amount;
}
// 获取存款余额
public double getBalance() {
return balance;
}
}
public class TestSavingAccount {
public static void main(String[] args) {
SavingAccount saver = new SavingAccount(30000);
SavingAccount.setAnnualInterestRate(0.03); // 设置年利率为3%
double balance = saver.getBalance();
double annualInterest = saver.getAnnualInterest();
double monthlyInterest = saver.getMonthlyInterest();
System.out.println("存款额:" + balance);
System.out.println("年利息:" + annualInterest);
System.out.println("月利息:" + monthlyInterest);
}
}
```
运行结果:
```
存款额:30000.0
年利息:900.0
月利息:75.0
```
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