创建用于在 ArrayList 中输入对象的方法

Question

我的任务是创建一个方法，该方法包含与已为我的对象创建的构造函数相同的变量，我已将其中 3 个添加到 ArrayList。

当在我的所有代码所在的主类中调用该方法时，我应该在 () 中写入我想要附加到新对象的信息，稍后将通过相同的方法将其添加到 ArrayList .

下面是我的代码的 sn-ps...

public class Joke extends Main {
public String username;
public String email;
public String firstName;
public String lastName;
public String phoneNumber;
public int jokeID;
public String jokeText;

public Joke(String username, String email, String firstName, String lastName, String phoneNumber, int jokeID, String jokeText) {
    this.username = username;
    this.email = email;
    this.firstName = firstName;
    this.lastName = lastName;
    this.phoneNumber = phoneNumber;
    this.jokeID = jokeID;
    this.jokeText = jokeText;
}

这就是我想出的方法

public static Joke addJokerToArrayList(String username, String email, String firstName, String lastName,
                                       String phoneNumber, int jokeID, String jokeText) {
    Joke joker4 = new Joke("", "", "", "", "", 4, "");
    System.out.println("Успешно добавихте Joke.");
    return joker4;
}

...我认为它不起作用... 以上代码位于Joke类中。

在我的主课中，我有：

package com.company;

import java.util.ArrayList;

public class Main {

    public static ArrayList<Joke> jokes;

    public static void main(String[] args) {


        Joke joker1 = new Joke("kartof23", "alfakartof23@hotmail.com", "Gregory", "Petrov",
                "0899458239", 1, "This is the funniest thing I have ever written!");
        Joke joker2 = new Joke("kalashnikov94", "kalashnikov94@hotmail.com", "Kliment", "Panaiotov",
                "0896482123", 2, "Never got that what i never got!");
        Joke joker3 = new Joke("haralampi45", "haralampi45@abv.bg", "Jordan", "Krumov",
                "0897439457", 3, "That lucky dog was actually a GOD!");

        jokes = new ArrayList<>();
        jokes.add(joker1);
        jokes.add(joker2);
        jokes.add(joker3);

        System.out.println();
        Joke.addJokerToArrayList("kamikadze23", "kamikadze23@gmail.com", "Liubomir", "Kirilov",
                "0874593204", 4, "Не би мирно седяло, не би чудо видяло..."); // <-- I am not sure if this is adding joker4 to the Array jokes.
    }

}

Answer 1

public static Joke addJokerToArrayList(String username, String email, String firstName, String lastName,
                                       String phoneNumber, int jokeID, String jokeText) {
    Joke joker4 = new Joke("", "", "", "", "", 4, "");
    System.out.println("Успешно добавихте Joke.");
Main.jokes.add(joker4);////this line would add the joker to the array list
    return joker4;
}

Main.jokes.add(joker4); Main 获取类，因为笑话是静态的，所以它获取变量并且 .add(joker4) 将笑话添加到数组列表中。

Answer 2

列表jokes 不在Joke 类中。您必须将返回的Joke 实例添加到列表中。

jokes.add(Joke.addJokerToArrayList(....));

另外，在你的addJokerToArrayList 方法中，我不知道你为什么不使用传递的值。应该是这样的，

return new Joke(username, email, firstName, lastName, phoneNumber, jokeId, jokeText);

Answer 3

代码审查：这是原始代码的重构工作版本：

public static ArrayList<Joke> jokes = new ArrayList<>();

public static void main(String[] args) {
    addJokerToArrayList("kartof23",
            "alfakartof23@hotmail.com",
            "Gregory",
            "Petrov",
            "0899458239",
            1,
            "This is the funniest thing I have ever written!");
    addJokerToArrayList("kalashnikov94",
            "kalashnikov94@hotmail.com",
            "Kliment",
            "Panaiotov",
            "0896482123",
            2,
            "Never got that what i never got!");
    addJokerToArrayList("haralampi45",
            "haralampi45@abv.bg",
            "Jordan",
            "Krumov",
            "0897439457",
            3,
            "That lucky dog was actually a GOD!");

    // output
    jokes.forEach(System.out::println);
}

public static Joke addJokerToArrayList(String username,
                                       String email,
                                       String firstName,
                                       String lastName,
                                       String phoneNumber,
                                       int jokeID,
                                       String jokeText) {
    Joke joke = new Joke(username, email, firstName,
            lastName, phoneNumber, jokeID, jokeText);
    if (jokes.add(joke)) {
        System.out.println("Успешно добавихте Joke.");
    }
    return joke;
}

public static class Joke {
    public String username;
    public String email;
    public String firstName;
    public String lastName;
    public String phoneNumber;
    public int jokeID;
    public String jokeText;

    public Joke(String username, String email,
                String firstName, String lastName,
                String phoneNumber, int jokeID, String jokeText) {
        this.username = username;
        this.email = email;
        this.firstName = firstName;
        this.lastName = lastName;
        this.phoneNumber = phoneNumber;
        this.jokeID = jokeID;
        this.jokeText = jokeText;
    }

    @Override
    public String toString() {
        return "Joke{" +
                "username='" + username + '\'' +
                ", email='" + email + '\'' +
                ", firstName='" + firstName + '\'' +
                ", lastName='" + lastName + '\'' +
                ", phoneNumber='" + phoneNumber + '\'' +
                ", jokeID=" + jokeID +
                ", jokeText='" + jokeText + '\'' +
                '}';
    }
}

输出：

Успешно добавихте Joke.
Успешно добавихте Joke.
Успешно добавихте Joke.
Joke{username='kartof23', email='alfakartof23@hotmail.com', firstName='Gregory', lastName='Petrov', phoneNumber='0899458239', jokeID=1, jokeText='This is the funniest thing I have ever written!'}
Joke{username='kalashnikov94', email='kalashnikov94@hotmail.com', firstName='Kliment', lastName='Panaiotov', phoneNumber='0896482123', jokeID=2, jokeText='Never got that what i never got!'}
Joke{username='haralampi45', email='haralampi45@abv.bg', firstName='Jordan', lastName='Krumov', phoneNumber='0897439457', jokeID=3, jokeText='That lucky dog was actually a GOD!'}