Java 创建构造函数、方法和存储数组的混乱规范？_Java_Arrays_Arraylist_Methods_Constructor

Java 创建构造函数、方法和存储数组的混乱规范？

java arrays methods

Java 创建构造函数、方法和存储数组的混乱规范？,java,arrays,arraylist,methods,constructor,Java,Arrays,Arraylist,Methods,Constructor,我正在做一项作业，我对别人要求我做什么感到困惑。规格为：创建一个FlashCard类，该类在其构造函数中包含两个字符串，一个用于问题，一个用于答案。抽认卡应具有getQuestion和getAnswer方法所以他们想让我创建一个构造函数，它有两个参数，一个用于问题，一个用于答案。然后他们希望我创建一个getAnswer和getQuestion方法，其中包含eah flashcard的答案和问题。但是如果flashcard包含两个字符串，那么这不意味着一个flashcard中同时包含答案和

我正在做一项作业，我对别人要求我做什么感到困惑。规格为：

创建一个FlashCard类，该类在其构造函数中包含两个字符串，一个用于问题，一个用于答案。抽认卡应具有getQuestion和getAnswer方法

所以他们想让我创建一个构造函数，它有两个参数，一个用于问题，一个用于答案。然后他们希望我创建一个getAnswer和getQuestion方法，其中包含eah flashcard的答案和问题。但是如果flashcard包含两个字符串，那么这不意味着一个flashcard中同时包含答案和问题吗？这意味着我不能有一个获取答案和获取问题的方法，因为它们不能分开

import java.util.ArrayList;

public class FlashCard {

         ArrayList<FlashCard> cardlist = new ArrayList<FlashCard>();


    FlashCard(String question, String answer)
    {

    }


    public ArrayList<FlashCard> getQuestion() {

    cardlist.add(new FlashCard("1Q - By what initials was Franklin Roosevelt better known?", "1A - FDR"));
    cardlist.add(new FlashCard("2Q - Which number president was Franklin Roosevelt?", "2A - 32"));
    cardlist.add(new FlashCard("3Q - Which state was Franklin Roosevelt3 born in?", "3A - New York"));
    cardlist.add(new FlashCard("4Q - In which year did Roosevelt become Governor of New York?", "4A - 1929"));
    cardlist.add(new FlashCard("5Q - What was the name of Franklin Roosevelt's wife?", "5A - Elenor"));
    cardlist.add(new FlashCard("6Q - How many children did Franklin Roosevelt have?", "6A - 6"));
    cardlist.add(new FlashCard("7Q - From which university did Franklin Roosevelt graduate with an A.B in history?", "7A - Harvard"));
    cardlist.add(new FlashCard("8Q - What was the first name of Franklin Roosevelt's 5th cousin, who was also President?", "8A - Theodore"));
    cardlist.add(new FlashCard("9Q - Which disease is believed to be the causes of Franklin Roosevelt's paralysis?", "9A - Polio"));
    cardlist.add(new FlashCard("10Q - At what age did Franklin Roosevelt die?", "10A - 63"));

    }

    public ArrayList<FlashCard> getAnswer() {

    cardlist.add(new FlashCard("1Q - By what initials was Franklin Roosevelt better known?", "1A - FDR"));
    cardlist.add(new FlashCard("2Q - Which number president was Franklin Roosevelt?", "2A - 32"));
    cardlist.add(new FlashCard("3Q - Which state was Franklin Roosevelt3 born in?", "3A - New York"));
    cardlist.add(new FlashCard("4Q - In which year did Roosevelt become Governor of New York?", "4A - 1929"));
    cardlist.add(new FlashCard("5Q - What was the name of Franklin Roosevelt's wife?", "5A - Elenor"));
    cardlist.add(new FlashCard("6Q - How many children did Franklin Roosevelt have?", "6A - 6"));
    cardlist.add(new FlashCard("7Q - From which university did Franklin Roosevelt graduate with an A.B in history?", "7A - Harvard"));
    cardlist.add(new FlashCard("8Q - What was the first name of Franklin Roosevelt's 5th cousin, who was also President?", "8A - Theodore"));
    cardlist.add(new FlashCard("9Q - Which disease is believed to be the causes of Franklin Roosevelt's paralysis?", "9A - Polio"));
    cardlist.add(new FlashCard("10Q - At what age did Franklin Roosevelt die?", "10A - 63")); 

    }

}

import java.util.ArrayList；
公共类抽认卡{
ArrayList cardlist=新建ArrayList（）；
抽认卡（字符串问题、字符串答案）
{
}
公共数组列表getQuestion（）{
添加（新的抽认卡（“1Q-富兰克林·罗斯福更出名的缩写是什么？”，“1A-FDR”）；
添加（新的抽认卡（“第2季度——哪位总统是富兰克林·罗斯福？”，“2A-32”）；
添加（新的抽认卡（“3Q-富兰克林·罗斯福出生在哪个州？”，“3A-纽约”）；
新增（新的抽认卡（“第4季度——罗斯福在哪一年成为纽约州州长？”，“4A-1929”）；
添加（新的抽认卡（“5Q-富兰克林·罗斯福的妻子叫什么名字？”，“5A-Elenor”）；
添加（新的抽认卡（“6Q-富兰克林·罗斯福有多少个孩子？”，“6A-6”）；
添加（新的抽认卡（“7Q-富兰克林·罗斯福从哪所大学毕业并获得历史学士学位？”，“7A-哈佛”）；
添加（新的抽认卡（“8Q-富兰克林·罗斯福的第五个表弟，也是总统的名字是什么？”，“8A-西奥多”）；
新增（新的抽认卡（“9Q-哪种疾病被认为是富兰克林·罗斯福瘫痪的原因？”，“9A-脊髓灰质炎”）；
添加（新的抽认卡（“10Q-富兰克林·罗斯福死在什么年龄？”，“10A-63”）；
}
公共数组列表getAnswer（）{
添加（新的抽认卡（“1Q-富兰克林·罗斯福更出名的缩写是什么？”，“1A-FDR”）；
添加（新的抽认卡（“第2季度——哪位总统是富兰克林·罗斯福？”，“2A-32”）；
添加（新的抽认卡（“3Q-富兰克林·罗斯福出生在哪个州？”，“3A-纽约”）；
新增（新的抽认卡（“第4季度——罗斯福在哪一年成为纽约州州长？”，“4A-1929”）；
添加（新的抽认卡（“5Q-富兰克林·罗斯福的妻子叫什么名字？”，“5A-Elenor”）；
添加（新的抽认卡（“6Q-富兰克林·罗斯福有多少个孩子？”，“6A-6”）；
添加（新的抽认卡（“7Q-富兰克林·罗斯福从哪所大学毕业并获得历史学士学位？”，“7A-哈佛”）；
添加（新的抽认卡（“8Q-富兰克林·罗斯福的第五个表弟，也是总统的名字是什么？”，“8A-西奥多”）；
新增（新的抽认卡（“9Q-哪种疾病被认为是富兰克林·罗斯福瘫痪的原因？”，“9A-脊髓灰质炎”）；
添加（新的抽认卡（“10Q-富兰克林·罗斯福死在什么年龄？”，“10A-63”）；
}
}

他们还需要返回

ArrayList

，因此我真的不知道如何构造它，以便

getQuestions（）

方法返回与答案相同的抽认卡问题。非常感谢您提供的任何帮助。

让我们尝试清除它：

但是如果flashcard包含两个字符串，那么这不意味着一个flashcard中同时包含答案和问题吗？对这个班有两名成员。问答。它们在调用构造函数的同一时刻绑定在一起。这可以而且应该是最终决定。类似于

私人最后一个字符串问题
这意味着我不能有一个获取答案和获取问题的方法，因为它们不能分开？
否。该类有两个方法，可以随时调用。它们在任何时候都给出相同的结果。类似于公共字符串getQuestion（）{return question；}

你的代码唯一的问题是你创建了两次抽认卡列表。不要那样做。将代码移动到单个点。可能放在一个单独的类中，其中包含抽认卡列表“Deck”。因此，当您创建一个“卡片组”时，它包含一个所有抽认卡的列表。
这意味着一个抽认卡有一个问题和一个答案
这两个构造函数参数都应该存储在FlashCard
对象中。这就是它的属性
getQuestion
和getAnswer
方法是getters，它们只返回相应的属性，这里是FlashCard唯一的问题/答案
但是如果flashcard包含两个字符串，那么这不意味着一个flashcard中同时包含答案和问题吗
是的，这就是卡的用途。如果答案与问题无关，你怎么能得到答案
这意味着我不能有一个获取答案和获取问题的方法，因为它们不能分开
import java.util.ArrayList;

public class FlashCard {

         ArrayList<FlashCard> cardlist = new ArrayList<FlashCard>();


    FlashCard(String question, String answer)
    {

    }


    public ArrayList<FlashCard> getQuestion() {

    cardlist.add(new FlashCard("1Q - By what initials was Franklin Roosevelt better known?", "1A - FDR"));
    cardlist.add(new FlashCard("2Q - Which number president was Franklin Roosevelt?", "2A - 32"));
    cardlist.add(new FlashCard("3Q - Which state was Franklin Roosevelt3 born in?", "3A - New York"));
    cardlist.add(new FlashCard("4Q - In which year did Roosevelt become Governor of New York?", "4A - 1929"));
    cardlist.add(new FlashCard("5Q - What was the name of Franklin Roosevelt's wife?", "5A - Elenor"));
    cardlist.add(new FlashCard("6Q - How many children did Franklin Roosevelt have?", "6A - 6"));
    cardlist.add(new FlashCard("7Q - From which university did Franklin Roosevelt graduate with an A.B in history?", "7A - Harvard"));
    cardlist.add(new FlashCard("8Q - What was the first name of Franklin Roosevelt's 5th cousin, who was also President?", "8A - Theodore"));
    cardlist.add(new FlashCard("9Q - Which disease is believed to be the causes of Franklin Roosevelt's paralysis?", "9A - Polio"));
    cardlist.add(new FlashCard("10Q - At what age did Franklin Roosevelt die?", "10A - 63"));

    }

    public ArrayList<FlashCard> getAnswer() {

    cardlist.add(new FlashCard("1Q - By what initials was Franklin Roosevelt better known?", "1A - FDR"));
    cardlist.add(new FlashCard("2Q - Which number president was Franklin Roosevelt?", "2A - 32"));
    cardlist.add(new FlashCard("3Q - Which state was Franklin Roosevelt3 born in?", "3A - New York"));
    cardlist.add(new FlashCard("4Q - In which year did Roosevelt become Governor of New York?", "4A - 1929"));
    cardlist.add(new FlashCard("5Q - What was the name of Franklin Roosevelt's wife?", "5A - Elenor"));
    cardlist.add(new FlashCard("6Q - How many children did Franklin Roosevelt have?", "6A - 6"));
    cardlist.add(new FlashCard("7Q - From which university did Franklin Roosevelt graduate with an A.B in history?", "7A - Harvard"));
    cardlist.add(new FlashCard("8Q - What was the first name of Franklin Roosevelt's 5th cousin, who was also President?", "8A - Theodore"));
    cardlist.add(new FlashCard("9Q - Which disease is believed to be the causes of Franklin Roosevelt's paralysis?", "9A - Polio"));
    cardlist.add(new FlashCard("10Q - At what age did Franklin Roosevelt die?", "10A - 63")); 

    }

}

答案和问题不能分开，因为它们都包含在FlashCard
对象中。但是您可以调用getQuestion
，而无需调用getAnswer
（另一种方法也是如此）
您在getQuestion
方法中输入的代码不应在此类中，与cardList
的声明相同。列表包含FlashCard
，但FlashCard
不应包含卡片列表。该代码可以创建多个闪存卡。你可以把它放在其他地方，比如在你的main方法中或者其他类中
public class PlaygroundMain {

        public static void main(String... args) {
                Scanner sc = new Scanner(System.in);
                PlaygroundMain gameDemo = new PlaygroundMain();
                System.out.println("Shuffling the cards");
                List<FlashCard> shuffledDeck = gameDemo.getQuestions();
                Collections.shuffle(shuffledDeck);
                System.out.println("Cards Shuffled!");
                int score = 0;

                for (FlashCard card : shuffledDeck) {
                        System.out.println(card.getQuestion());
                        final String answer = sc.nextLine();

                        if (answer.trim().equals(card.getAnswer())) {
                                System.out.println("You have answered right!, giving you a point");
                                score++;
                        } else {
                                System.out.println("Sorry, you have answered wrong, the correct answer is: "+card.getAnswer());
                        }

                        if (shuffledDeck.indexOf(card) != shuffledDeck.size()-1) {
                                System.out.println("Preparing next question...");
                        }
                }

                System.out.println("Your score is: "+score);
        }


        public List<FlashCard> getQuestions() {
                FlashCard c1 = new FlashCard("Q1: What is my name?", "Alfred");
                FlashCard c2 = new FlashCard("Q2: What is my age?", "26");
                return Arrays.asList(c1, c2);
        }

        class FlashCard {
                private final String question;
                private final String answer;

                public FlashCard(String question, String answer) {
                        this.question = question;
                        this.answer = answer;
                }


                public String getQuestion() {
                        return question;
                }

                public String getAnswer() {
                        return answer;
                }

        }
}