卡在无法查看数组列表的内容

Question

我对 java 很陌生，发现很难习惯这些术语，我已经搜索了互联网，但我尝试的所有方法都不起作用，因为我不知道如何在我的代码中正确实现它......如何我可以简单地让控制台显示我在数组列表中输入的内容吗？谢谢

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

public class Account {
    List<String> name = new ArrayList<>();
    List<String> address = new ArrayList<>();
    List<String> createOption = new ArrayList<>();
    List<String> sortCode = new ArrayList<>();
    List<Integer> deposit = new ArrayList<>();
    List<Double> accountNumber = new ArrayList<>();

    Scanner keyboard = new Scanner(System.in);

    public void accountCreation() {
        String name = "", address = "", createOption = "", sortCode = "", deposit = "";
        double accountNumber = 0;
        boolean valid = false;
        while (!valid) {
            System.out.println("What account would you like to create?");
            System.out.println("Current or savings?");
            createOption = keyboard.nextLine();
            if (createOption.equalsIgnoreCase("current") || createOption.equalsIgnoreCase("savings")) {
                valid = true;
            } else {
                System.out.println("Please enter checking or savings");
            }
        }
        System.out.print("Please enter your name:");
        name = keyboard.nextLine();
        System.out.print("Please enter your address");
        address = keyboard.nextLine();
        System.out.print("Please enter an initial deposit");
        deposit = keyboard.nextLine();
        System.out.print("Please enter an sort code ");
        sortCode = keyboard.nextLine();
        System.out.print("Please enter an account number");
        accountNumber = Double.parseDouble(keyboard.nextLine());
        valid = false;

        System.out.println();
    }
}

Answer 1

我更改了您的完整名称，因为您的代码无法打印任何内容，因为缺少 ma​​in 方法：

public class Account {
public static void main(final String[] args) {
    new Account().accountCreation();
}

List<String> names = new ArrayList<String>();

public void accountCreation() {

    final Scanner keyboard = new Scanner(System.in);

    System.out.print("Please enter your name:");
    names.add(keyboard.nextLine());
    for (final String name : names) {
        System.out.println("Name: " + name);
    }
}

}

您可以以类似的方式完成其余的工作。 （ArrayList 只有在你想要有很多条目时才有意义；如果你需要循环的话。） ....

Answer 2

你做错了。您必须使用 add() 将项目添加到 ArrayList。

例如：

name.add(keyboard.nextLine());

为了显示ArrayList 中的项目，您可以使用如下循环：

for(String n : name) {
    System.out.println("Name: " + n);
}

您必须为程序中的所有其他 ArrayLists 更正它。