數組列表平均值

Question

我想知道如何獲得最小的帳戶也打印其帳戶號碼，餘額和平均交易金額的最大&。

我試過了各種各樣的裝束，並沒有得到任何地方。

import java.util.ArrayList; 
import java.util.Scanner; 

public class BankAccount { 


    private int AccountNumber; 
    public int getAccountNumber() 
    { 
     return AccountNumber; 
    } 

    private double Balance; 
    public double getBalance() 
    { 
     return Balance; 
    } 

    private ArrayList<Double> transactions = new ArrayList<Double>(); 

    public void Deposit(double Balance) 
    { 
     transactions.add(Balance); 
     this.Balance = this.Balance + Balance; 
    } 

    public void Withdraw(double Balance) 
    { 
     transactions.add(-Balance); 
     this.Balance = this.Balance - Balance; 
    } 

    public BankAccount(int initialAccountNumber, double initialBalance) 
    { 
     this.Balance = initialBalance; 
     this.AccountNumber = initialAccountNumber; 
     transactions.add(initialBalance); 
    } 

    public double getAverage() 
    { 
     double sum = 0; 
     for (double element : transactions) 
     { 
      sum = sum + Math.abs(element); 
     } 

     double Average = sum/transactions.size(); 
     return Average; 
    } 

    } 


--- 

    import java.util.ArrayList; 

    public class Bank { 

     private ArrayList<BankAccount> accounts = new ArrayList<BankAccount>(); 


     public void MakeAccount(int initialAccountNumber, double initialBalance) 
     { 
      BankAccount NewAcc = new BankAccount(initialAccountNumber, initialBalance); 
      accounts.add(NewAcc); 
     } 


     public BankAccount FindLarAcc(int initialAccountNumber, double initialBalance) 
     { 
      BankAccount largest = accounts.get(0); 

      for (int i = 1; i < accounts.size(); i++) 
      { 
       BankAccount a = accounts.get(i); 
       if (a.getBalance() > largest.getBalance()) 
        largest = a; 
      } 
      return largest; 
        } 


     public BankAccount FindLowAcc(int initialAccountNumber, double initialBalance) 
     { 
      BankAccount smallest = accounts.get(0); 

      for (int i = 1; i < accounts.size(); i++) 
      { 
       BankAccount a = accounts.get(i); 
       if (a.getBalance() < smallest.getBalance()) 
        smallest = a; 
      } 
      return smallest; 
        } 

     public BankAccount FindAcc(int initialAccountNumber) 
     { 
      for (BankAccount a: accounts) 
      { 
       if (a.getAccountNumber() == initialAccountNumber) 
        return a; 
      } 
      return null; 
     } 

    } 


--- 

    import java.util.Scanner; 

    public class BankTester { 

    public static void main(String[] args){ 

    Scanner in = new Scanner (System.in); 
    /**int AccountNumber = 0;*/ 
    double Balance = 0; 
    double Amount = 0; 

    Bank Bank1 = new Bank(); 


    boolean done = false; 
    while (!done) 
    { 
     System.out.println("Enter an Account Number to begin, enter -1 to quit: "); 
     int AccountNumber = in.nextInt(); 
     if (AccountNumber == -1) 
     { 
      done = true; 
     } else { 

      System.out.println("Now enter a Balance: "); 
      Balance = in.nextDouble(); 
      Bank1.MakeAccount(AccountNumber, Balance); 
      BankAccount B = Bank1.FindAcc(AccountNumber); 

      System.out.println("How much would you like to deposit? "); 
      Amount = in.nextDouble(); 
      B.Deposit(Amount); 

      System.out.println("How much would you like to withdrawl? "); 
      Amount = in.nextDouble(); 
      B.Withdraw(Amount); 


     } 



     BankAccount Max = Bank1.FindLarAcc(AccountNumber, Balance); 
     BankAccount Min = Bank1.FindLowAcc(AccountNumber, Balance); 

     /** 
     * Print & Compute Average 
     */ 


     System.out.println("Account " + Min.getAccountNumber() +      
       " has the smallest balance. "); 

     System.out.println("Account " + Max.getAccountNumber() + 
       " has the largest balance. "); 




     } 

    } 

} 

Answer 1

對於那些可能有同樣問題的人......我想通了！

這屬於對BankTester類，順便說一句

System.out.println("Account " + Min.getAccountNumber() +      
      " has the smallest balance of, " + Min.getBalance() + 
      " and a average transaction of, " + Min.getAverage()); 


    System.out.println("Account " + Max.getAccountNumber() + 
      " has the largest balance of, " + Max.getBalance() + 
      " and a average transaction of, " + Max.getAverage());