Question

我对java很新，发现很难习惯这些术语，我已经搜索了互联网，但我尝试的一切都不起作用，因为我不知道如何在我的代码中正确实现它......我可以简单地让控制台显示我输入到数组列表中的内容吗？感谢

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

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，您可以按如下方式使用循环：

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

您必须为您计划中的所有其他ArrayLists更正此内容。

Answer 2

我更改了您的完整名称，因为您的代码无法打印任何内容，因为主方法丢失了：

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);
    }
}

}

你可以用类似的方式完成剩下的工作。（只有当你想要有很多条目时，ArrayList才有意义;如果你需要，你应该循环。）....

坚持无法查看数组列表的内容

2 个答案: