题库管理。管理员对试题信息的增、删、改、查、导入、导出管理。试题包括单选题、多选题和判断题3种题型。选择题包括题干、选项A、选项B、选项C、选项D、答案、题目解析等。判断题包括题干、选项A、选项B、答案、题目解析等。Java代码

以下是一个简单的Java代码示例，实现了题库管理系统中的增、删、改、查、导入、导出等功能：

import java.io.*;
import java.util.*;

class Question {
    private int id;
    private String content;
    private String optionA;
    private String optionB;
    private String optionC;
    private String optionD;
    private String answer;
    private String analysis;
    private String type;

    public Question(int id, String content, String optionA, String optionB, String optionC, String optionD,
                    String answer, String analysis, String type) {
        this.id = id;
        this.content = content;
        this.optionA = optionA;
        this.optionB = optionB;
        this.optionC = optionC;
        this.optionD = optionD;
        this.answer = answer;
        this.analysis = analysis;
        this.type = type;
    }

    public int getId() {
        return id;
    }

    public String getContent() {
        return content;
    }

    public String getOptionA() {
        return optionA;
    }

    public String getOptionB() {
        return optionB;
    }

    public String getOptionC() {
        return optionC;
    }

    public String getOptionD() {
        return optionD;
    }

    public String getAnswer() {
        return answer;
    }

    public String getAnalysis() {
        return analysis;
    }

    public String getType() {
        return type;
    }

    public String toString() {
        return id + "," + content + "," + optionA + "," + optionB + "," + optionC + "," + optionD + ","
                + answer + "," + analysis + "," + type;
    }
}

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

    public void addQuestion(Question question) {
        questions.add(question);
    }

    public void deleteQuestion(int id) {
        for (Question question : questions) {
            if (question.getId() == id) {
                questions.remove(question);
                break;
            }
        }
    }

    public void updateQuestion(Question question) {
        for (int i = 0; i < questions.size(); i++) {
            if (questions.get(i).getId() == question.getId()) {
                questions.set(i, question);
                break;
            }
        }
    }

    public List<Question> getQuestions() {
        return questions;
    }

    public List<Question> getQuestionsByType(String type) {
        List<Question> result = new ArrayList<>();
        for (Question question : questions) {
            if (question.getType().equals(type)) {
                result.add(question);
            }
        }
        return result;
    }

    public void importQuestions(String filename) throws IOException {
        BufferedReader reader = new BufferedReader(new FileReader(filename));
        String line;
        while ((line = reader.readLine()) != null) {
            String[] fields = line.split(",");
            int id = Integer.parseInt(fields[0]);
            String content = fields[1];
            String optionA = fields[2];
            String optionB = fields[3];
            String optionC = fields[4];
            String optionD = fields[5];
            String answer = fields[6];
            String analysis = fields[7];
            String type = fields[8];
            Question question = new Question(id, content, optionA, optionB, optionC, optionD, answer, analysis, type);
            questions.add(question);
        }
        reader.close();
    }

    public void exportQuestions(String filename) throws IOException {
        BufferedWriter writer = new BufferedWriter(new FileWriter(filename));
        for (Question question : questions) {
            writer.write(question.toString());
            writer.newLine();
        }
        writer.close();
    }
}

public class Test {
    public static void main(String[] args) throws IOException {
        QuestionBank questionBank = new QuestionBank();

        // add question
        questionBank.addQuestion(new Question(1, "2+2=?", "A. 1", "B. 2", "C. 3", "D. 4", "D", "解析1", "单选题"));
        questionBank.addQuestion(new Question(2, "1+1=?", "A. 1", "B. 2", "C. 3", "D. 4", "B", "解析2", "单选题"));
        questionBank.addQuestion(new Question(3, "2+3=?", "A. 4", "B. 5", "C. 6", "D. 7", "B", "解析3", "单选题"));
        questionBank.addQuestion(new Question(4, "1+1=?", "A. 1", "B. 2", "C. 3", "D. 4", "B", "解析4", "多选题"));
        questionBank.addQuestion(new Question(5, "2+2=?", "A. 1", "B. 2", "C. 3", "D. 4", "ABCD", "解析5", "多选题"));
        questionBank.addQuestion(new Question(6, "1+1=?", "正确", "错误", "", "", "正确", "解析6", "判断题"));

        // delete question
        questionBank.deleteQuestion(1);

        // update question
        Question question = new Question(2, "1+1=?", "A. 1", "B. 2", "C. 3", "D. 4", "C", "解析7", "单选题");
        questionBank.updateQuestion(question);

        // get questions
        List<Question> questions = questionBank.getQuestions();
        for (Question q : questions) {
            System.out.println(q);
        }

        // get questions by type
        List<Question> singleQuestions = questionBank.getQuestionsByType("单选题");
        for (Question q : singleQuestions) {
            System.out.println(q);
        }

        // import questions
        questionBank.importQuestions("questions.txt");

        // export questions
        questionBank.exportQuestions("questions_backup.txt");
    }
}

这个例子定义了Question类和QuestionBank类，其中Question类包含了题目的各种信息，QuestionBank类用于管理题目，包括增、删、改、查、导入、导出等功能。在main方法中，初始化了一些题目，然后演示了各种功能的调用，包括添加、删除、更新、查询、导入、导出等。实际的题库管理系统需要更多的功能和复杂的实现。