Question

我正在上课。到目前为止我已经完成了1-3次，但我无法确定如何实现4和5.我已经坚持了一段时间。必须使用两个类。

银行中有多少银行帐户

2）创建一个新数组以保存指定数量的BankAccounts

3）在循环中，询问用户银行帐号和余额，使用帐号和余额构建BankAccount对象，并将新的BankAccount对象放入数组中

4）用户输入所有银行账户后，使用for循环（或每个循环一次）来计算数组中账户的总余额

5）打印帐户的计算总余额和平均余额。

package Hw2;
import java.util.Scanner;
import java.util.ArrayList;

public class BankArrayTester {
public static void main(String[] args){
      Scanner in = new Scanner(System.in);
      System.out.println("Please enter the number bank accounts:");
      int accounts= in.nextInt();
      BankAccount [] accountinfo = new BankAccount [accounts];
      int c=0;
      while(c<accounts){
          c++;
         System.out.println("Enter account number for account "+c);
        int number=in.nextInt();
        System.out.println("Enter balance for account "+c);
        double balance=in.nextDouble();
        int a=0;
        BankAccount numberbalance = new BankAccount(number,balance);
        accountinfo [a]=numberbalance;
        double test1;
        for (int i = 0; i < accountinfo.length; i++) {
            test1 = accountinfo[a].getBalance(); 
            System.out.println(test1);
        }
      }
    }
}

其他班级

    package Hw2;
     /**
     A bank account has a balance that can be changed by 
   deposits and withdrawals.
  */
  public class BankAccount
  {
    private double balance;
    private int accountNumber;

/**
   Constructs a bank account with a zero balance.
*/
public BankAccount(int _accountNumber)
{   
   balance = 0;
}

/**
   Constructs a bank account with a given balance.
   @param initialBalance the initial balance
*/
public BankAccount(int _accountNumber, double initialBalance)
{   
   accountNumber = _accountNumber;
   balance = initialBalance;
}

/**
   Deposits money into the bank account.
   @param amount the amount to deposit
*/
public void deposit(double amount)
{  
   double newBalance = balance + amount;
   balance = newBalance;
}

/**
   Withdraws money from the bank account.
   @param amount the amount to withdraw
*/
public void withdraw(double amount)
{   
   double newBalance = balance - amount;
   balance = newBalance;
}

/**
   Gets the current balance of the bank account.
   @return the current balance
*/
public double getBalance()
{   
   return balance;
}
}

/**
   Gets the account number of the bank account.
   @return the account number
*/

Answer 1

使用以下方法查找余额总和

double sum=0;
for (int i = 0; i < accountinfo.length; i++) {
        test1 = accountinfo[i].getBalance(); 
        sum+=test1;
        System.out.println(test1);
    }

打印总和和平均值

System.out.println("Total ::"+sum);
System.out.println("Average ::"+sum/accounts);

Answer 2

你需要知道如何平均计算（至少）。如果将所有元素的总和除以元素的数量，您将获得平均值。我的建议是使用一个for循环，它会起作用：）

获得Array的总和和平均值

2 个答案: