java - Mooc Helsinki Part 1 第 4 周练习 18 Java

Question

此处描述的程序应在 PersonalInformationCollection 类中实现。注意!不要修改 PersonalInformation 类。

在用户输入最后一组详细信息后(他们输入一个空的名字)，退出重复语句。

然后打印收集到的个人信息，以便每个输入的对象都按以下格式打印:名字和姓氏用空格分隔(您不打印标识号)。下面给出了一个工作程序的例子:

Sample output
First name: Jean
Last name: Bartik
Identification number: 271224
First name: Betty
Last name: Holberton
Identification number: 070317
First name:

Jean Bartik
Betty Holberton

PersonalInformation类(class):

public class PersonalInformation {

    private String firstName;
    private String lastName;
    private String identificationNumber;

    public PersonalInformation(String firstName, String lastName, String identificationNumber) {
        this.firstName = firstName;
        this.lastName = lastName;
        this.identificationNumber = identificationNumber;
    }

    public String getFirstName() {
        return firstName;
    }

    public String getLastName() {
        return lastName;
    }

    public String getIdentificationNumber() {
        return identificationNumber;
    }

    @Override
    public String toString() {
        return this.lastName + ", " + this.firstName + " (" + this.identificationNumber + ")";
    }
}

我的解决方案只能打印所有值，而不仅仅是数组中的名字和姓氏:

public class Main {

    public static void main(String[] args) {
        // write your code here
        Scanner scanner = new Scanner(System.in);
        ArrayList<PersonalInformation> infoCollection = new ArrayList<>();


        while (true) {
            System.out.println("First name: ");
            String firstName = scanner.nextLine();
            if (firstName.equals("")) {
                break;
            }
            System.out.println("Last name: ");
            String lastName = scanner.nextLine();
            System.out.println("Identification number: ");
            String identificationNumber = scanner.nextLine();

            infoCollection.add(new PersonalInformation(firstName, lastName, identificationNumber));


        }
        System.out.println(infoCollection);


    }


}

我需要修改代码。我是一个初学者，一个解释性的建议将不胜感激。

Answer 1

代替

System.out.println(infoCollection);

你会有

infoCollection.stream().forEach(p -> System.out.println(p.getFirstName() + " " + p.getLastName()));