java写一个试题库管理系统

下面是一个简单的Java试题库管理系统的代码示例：

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

public class QuestionBank {
    private ArrayList<Question> questions = new ArrayList<>();

    public void addQuestion() {
        Scanner scanner = new Scanner(System.in);

        System.out.print("请输入题目类型（单选题、多选题、判断题）：");
        String type = scanner.next();

        System.out.print("请输入题目描述：");
        String description = scanner.next();

        System.out.print("请输入选项（每个选项用逗号隔开）：");
        String[] options = scanner.next().split(",");

        System.out.print("请输入正确答案（单选题和判断题只需输入一个选项编号，多选题需要输入多个选项编号，用逗号隔开）：");
        String[] answer = scanner.next().split(",");

        Question question = new Question(type, description, options, answer);
        questions.add(question);

        System.out.println("题目已添加成功！");
    }

    public void deleteQuestion() {
        Scanner scanner = new Scanner(System.in);

        System.out.print("请输入要删除的题目编号：");
        int index = scanner.nextInt() - 1;

        if (index < 0 || index >= questions.size()) {
            System.out.println("题目编号无效！");
            return;
        }

        questions.remove(index);

        System.out.println("题目已删除成功！");
    }

    public void queryQuestion() {
        Scanner scanner = new Scanner(System.in);

        System.out.print("请输入要查询的题目类型（单选题、多选题、判断题），如果不限制类型则输入all：");
        String type = scanner.next();

        System.out.print("请输入要查询的关键字：");
        String keyword = scanner.next();

        System.out.println("查询结果如下：");

        int count = 0;

        for (Question question : questions) {
            if (type.equals("all") || question.getType().equals(type)) {
                if (question.getDescription().contains(keyword)) {
                    count++;
                    System.out.println("题目编号：" + (count) + "，题目类型：" + question.getType() + "，题目描述：" + question.getDescription() + "，选项：" + String.join(",", question.getOptions()) + "，答案：" + String.join(",", question.getAnswer()));
                }
            }
        }

        if (count == 0) {
            System.out.println("没有查询到任何题目！");
        }
    }

    public void showMenu() {
        Scanner scanner = new Scanner(System.in);

        while (true) {
            System.out.println("请选择操作：");
            System.out.println("1. 添加题目");
            System.out.println("2. 删除题目");
            System.out.println("3. 查询题目");
            System.out.println("4. 退出程序");

            int choice = scanner.nextInt();

            switch (choice) {
                case 1:
                    addQuestion();
                    break;
                case 2:
                    deleteQuestion();
                    break;
                case 3:
                    queryQuestion();
                    break;
                case 4:
                    System.out.println("程序已退出！");
                    return;
                default:
                    System.out.println("无效的选项，请重新输入！");
                    break;
            }
        }
    }

    public static void main(String[] args) {
        QuestionBank questionBank = new QuestionBank();
        questionBank.showMenu();
    }
}

class Question {
    private String type;
    private String description;
    private String[] options;
    private String[] answer;

    public Question(String type, String description, String[] options, String[] answer) {
        this.type = type;
        this.description = description;
        this.options = options;
        this.answer = answer;
    }

    public String getType() {
        return type;
    }

    public String getDescription() {
        return description;
    }

    public String[] getOptions() {
        return options;
    }

    public String[] getAnswer() {
        return answer;
    }
}

这个试题库管理系统包含了添加题目、删除题目、查询题目等功能。当用户选择添加题目时，程序会要求用户输入题目类型、题目描述、选项和答案，并将题目添加到题库中；当用户选择删除题目时，程序会要求用户输入要删除的题目编号，并将该题目从题库中删除；当用户选择查询题目时，程序会要求用户输入题目类型和关键字，然后根据用户输入的条件在题库中进行查询，并将查询结果输出到屏幕上。

在实际的应用中，可以根据需要对程序进行进一步的修改和完善，例如添加登录界面、界面美化等功能。