如何获得一个类的实例？ [英] How to get an instance of a class?

问题描述

我有以下代码

class driver{
        static BankAccount GetAccount(Customer customer, char c) {
            BankAccount accSrc = customer.S;
            // savings account
            if (c =='S') {
                accSrc = customer.S;
            // loan account
            } else if (c =='L') {
                accSrc = customer.L;
            // checking account
            } else if (c =='C') {
                accSrc = customer.C;
            // auto loan account
            } else if (c =='A') {
                accSrc = customer.A;
            }
            return accSrc;
        }
        public static void main(String[] args) {
            // TODO Auto-generated method stub
            Customer forrest = new Customer("Forrest Gump", 1, "42 New Street, New York, New York"); // me
            Customer random = new Customer("Random Name", 2, "44 New Street, New York, New York"); // imaginary partner
            //try{
                String input = JOptionPane.showInputDialog("Please enter your transaction information: ");
                Scanner s = new Scanner(input);
                int id  = Integer.parseInt(s.next());
                char action = Character.toUpperCase((s.next().charAt(0)));
                char accSrc = ' ';
                char accDest = ' ';
                double amount = 0;

                if(action == 'T'){
                    amount = s.nextDouble();
                    accSrc = s.next().charAt(0);
                    accDest = s.next().charAt(0);
                }else if(action == 'G' || action == 'I'){
                    accSrc = s.next().charAt(0);
                }else{
                    //if D,W
                    amount = s.nextDouble();
                    accSrc = s.next().charAt(0);
                }

            //}catch (IOException e){

            //}
                if(id==1){
                    return forrest;
                }else if(id == 2){
                    return random;
                }
                BankAccount src = GetAccount(forrest,  accSrc);
                System.out.print(src.getOwner().name);
                if(action == 'T'){
                    BankAccount dst = GetAccount(forrest, accDest);
                    src.transfer(amount, dst);
.

    ..
    }

    class Customer{
        protected String name;
        protected int id;
        protected String address;
        protected BankAccount C = new BankAccount(id, this, 0);
        protected BankAccount S = new BankAccount(id, this, 0);
        protected BankAccount A = new BankAccount(id, this, 0);
        protected BankAccount L = new BankAccount(id, this, 0);
    ...
    }

当前正在对银行帐户<$ c $进行硬编码c> src = GetAccount（forrest，accSrc）; 我该如何继续编写代码，以便它返回给定id号的客户实例（例如1个给定的forrest回报，2个给定的随机回报）？

currently im hard coding BankAccount src = GetAccount(forrest, accSrc); how can I proceed to writing code so it returns an instance of the customers given an id number (say 1 given returns forrest, 2 given returns random) ?

推荐答案

更好的

Customer customers[] = { forrest, random };

我可以使用 customer [id]

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