Question

我如何在ArrayList中动态命名对象。所以我有这个：

        optionNum = input.nextInt();
        switch (optionNum) {
            case 1: //Customer Information Retrieval
                    int i = 0;
                    System.out.println("What is the customer ID");
                        customerId = input.next();
                        newCustomer.setcustomerId(customerId);
                    System.out.println("What is the customer first name?");
                        firstName = input.next();
                        newCustomer.setfirstName(firstName);
                    System.out.println("What is the customer last name?");
                        lastName = input.next();
                        newCustomer.setlastName(lastName);
                    System.out.println("What is the customer age?");
                        age = input.nextInt();
                        newCustomer.setAge(age);
                    System.out.println("What is the customer income?");
                        income = input.nextDouble();
                        newCustomer.setIncome(income);
                    System.out.println("What is the customer credit score?");
                        creditScore= input.nextInt();
                        newCustomer.setcreditScore(creditScore);
                    newCustomer.Attributes(customerId, firstName, lastName, age, income, creditScore);
                    customers.add(i, newCustomer);
                    i++;
                    break;

它是在while循环中，但每次我添加一个新客户时它会覆盖旧客户，留下两个拥有相同信息的客户。如何让它在循环的每次迭代中创建一个新对象？

Answer 1

在case块内创建newCustomer对象，而不是在outside。您基本上覆盖了同一个对象，导致先前的值被覆盖，而每次在列表中也会生成一个新条目。

Answer 2

1）在循环之前声明客户：客户newCustomer = null; 2）在循环内创建客户实例并在newCustomer对象中设置。 newCustomer = new Customer（）; 3）填写客户对象 4）将其添加到客户列表

希望这可以帮助你!!!

在Java ArrayLists中动态命名对象

2 个答案: