A Bank Account Class

Question

根据以下要求完善Account.java，注意在未完成ManageAccounts.java前程序无法运行。

n  完善toString方法，返回一个字符串包含name, account number, balance.

n  完善chargeFee方法，从账户中扣除10元的服务费

n  修改chargeFee方法，原方法返回值类型为void，修改后让它返回新的balance

n  完善changeName方法，用string类型作为参数名来修改账户名

public class Account
{
private double balance;
private String name;
private long acctNum;
//----------------------------------------------
//Constructor -- initializes balance, owner, and account number
//----------------------------------------------
public Account(double initBal, String owner, long number)
{
balance = initBal;
name = owner;
acctNum = number;
}
//----------------------------------------------
// Checks to see if balance is sufficient for withdrawal.
// If so, decrements balance by amount; if not, prints message.
//----------------------------------------------
public void withdraw(double amount)
{
if (balance >= amount)
balance -= amount;
else
System.out.println("Insufficient funds");
}
//----------------------------------------------
// Adds deposit amount to balance.
//52 Chapter 4: Writing Classes
//----------------------------------------------
public void deposit(double amount)
{
balance += amount;
}
//----------------------------------------------
// Returns balance.
//----------------------------------------------
public double getBalance()
{
return balance;
}
//----------------------------------------------
// Returns a string containing the name, account number, and balance.
//----------------------------------------------
public String toString()
{
 return string
}
//----------------------------------------------
// Deducts $10 service fee
//----------------------------------------------
public void chargeFee()
{
}
//----------------------------------------------
// Changes the name on the account
//----------------------------------------------
public void changeName(String newName)
{
}
}