java - 如何让我的 java ArrayList 正确显示？

Question

我有一个类，用户可以在其中输入有关用户确定的员工数量的员工信息(名字和姓氏、地址、雇用日期)。

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

public class Employee {
    public static void main(String [] args){
        String employeeName = null;
        String employeeAddress = null;
        String hireDate = null;

        Scanner userInput = new Scanner(System.in);
        System.out.println("How many employees would you like to enter information for?");
        int numEmployees = userInput.nextInt();

        for( int i = 0; i < numEmployees; i++) {
            Scanner input = new Scanner(System.in);
            System.out.println("Enter employees first name: ");
            String firstName = input.nextLine();
            System.out.println("Enter employees last name: ");
            String lastName = input.nextLine();
            System.out.println("Enter street employee lives on:");
            String street = input.nextLine();
            System.out.println("Enter city employee lives in:");
            String city = input.nextLine();
            System.out.println("Enter state employee lives in:");
            String state = input.nextLine();
            System.out.println("Enter employee's zip code:");
            String zip = input.nextLine();
            System.out.println("Enter month employee was hired:");
            String month = input.nextLine();
            System.out.println("Enter day employee was hired:");
            String day = input.nextLine();
            System.out.println("Enter year employee was hired:");
            String year = input.nextLine();

            Name name = new Name(firstName, lastName);
            Address address = new Address(street, city, state, zip);
            Date date = new Date(month, day, year);

            employeeName = name.getName();
            employeeAddress = address.getAddress();
            hireDate = date.getDate();

            ArrayList<String> obj = new ArrayList<String>();
            obj.add(employeeName);
            obj.add(employeeAddress);
            obj.add(hireDate);
            System.out.println(obj);
        }
    }
}

我试图让程序通过用户提示，获取该信息并将其放在 ArrayList 中的某个位置，然后重复用户之前确定的任意次数，并在最后一次显示所有内容。像这样的事情:

FirstName LastName, Address, Hire Date
FirstName LastName, Address, Hire Date

等等。现在，我的代码将运行用户提示，显示该提示，然后运行下一轮提示并显示该提示:

Enter Name:
 Name
Enter Address:
 Address
Enter Hire Date:
 Hire Date

[Name, Address, Hire Date]

Enter Name:
 Name
Enter Address:
 Address
Enter Hire Date:
 Hire Date

[Name, Address, Hire Date]

我意识到这是因为我的数组和数组显示位于 for 循环内，但是当我将数组移到循环外时，我没有显示。当我仅将数组显示移到循环之外时，我的代码无法编译。

Answer 1

移动此行:

System.out.println(obj);

跳出for循环。并使用List来包含ArrayList。然后将其显示在单独的 for 循环中:

List<ArrayList<String>> objs = new ArrayList<ArrayList<String>>(); //use list of objs
for( int i = 0; i < numEmployees; i++ )
{
    //all the inputs

    ArrayList<String> obj = new ArrayList<String>();
    obj.add(employeeName);
    obj.add(employeeAddress);
    obj.add(hireDate);
    objs.add(obj);

}

for( int i = 0; i < numEmployees; i++ ) //for loop just to display
    System.out.println(objs.get(i)); //display each element here