优化一下，要求自定义顾客汇款次数和金额，每个顾客每次汇款金额相同

好的，以下是优化后的Java代码：

import java.util.ArrayList;
import java.util.Collections;
import java.util.Random;

public class BankAccount {
    private double totalAmount;
    private ArrayList<Customer> customers;
    private Random random;

    public BankAccount() {
        totalAmount = 0.0;
        customers = new ArrayList<Customer>();
        random = new Random();
    }

    public void addCustomer(Customer customer) {
        customers.add(customer);
    }

    public void simulate() {
        ArrayList<Integer> indices = new ArrayList<Integer>();
        for (int i = 0; i < customers.size(); i++) {
            indices.add(i);
        }
        Collections.shuffle(indices, random);
        for (int index : indices) {
            Customer customer = customers.get(index);
            for (int i = 0; i < customer.getNumOfTransactions(); i++) {
                double amount = customer.getTransactionAmount();
                totalAmount += amount;
            }
        }
        System.out.println("Total amount: " + totalAmount);
    }

    public static void main(String[] args) {
        BankAccount bankAccount = new BankAccount();
        int numOfCustomers = 5;
        int numOfTransactions = 3;
        double transactionAmount = 100.0;
        for (int i = 1; i <= numOfCustomers; i++) {
            Customer customer = new Customer(i, numOfTransactions, transactionAmount);
            bankAccount.addCustomer(customer);
        }
        bankAccount.simulate();
    }
}

class Customer {
    private int id;
    private int numOfTransactions;
    private double transactionAmount;

    public Customer(int id, int numOfTransactions, double transactionAmount) {
        this.id = id;
        this.numOfTransactions = numOfTransactions;
        this.transactionAmount = transactionAmount;
    }

    public int getId() {
        return id;
    }

    public int getNumOfTransactions() {
        return numOfTransactions;
    }

    public double getTransactionAmount() {
        return transactionAmount;
    }
}

现在，您可以自定义顾客的数量，每个顾客的汇款次数和金额。在这个程序中，我们将顾客的每次汇款金额设为100，汇款次数设为3。您可以根据需要修改这些值。