实现考试系统根据题型权重出题Java代码

以下是一个简单的 Java 代码示例，根据题型权重实现出题系统：

import java.util.ArrayList;
import java.util.HashMap;
import java.util.Random;

public class ExamSystem {
    // 定义题型常量
    private static final int SINGLE_CHOICE = 1;
    private static final int MULTI_CHOICE = 2;
    private static final int FILL_BLANK = 3;
    private static final int ESSAY_QUESTION = 4;

    // 定义题型对应的权重
    private static final HashMap<Integer, Double> questionTypeWeight = new HashMap<Integer, Double>() {{
        put(SINGLE_CHOICE, 0.3);
        put(MULTI_CHOICE, 0.4);
        put(FILL_BLANK, 0.2);
        put(ESSAY_QUESTION, 0.1);
    }};

    // 定义题库
    private static final ArrayList<String> singleChoiceQuestions = new ArrayList<String>() {{
        add("单选题1");
        add("单选题2");
        add("单选题3");
        add("单选题4");
        add("单选题5");
    }};
    private static final ArrayList<String> multiChoiceQuestions = new ArrayList<String>() {{
        add("多选题1");
        add("多选题2");
        add("多选题3");
        add("多选题4");
        add("多选题5");
    }};
    private static final ArrayList<String> fillBlankQuestions = new ArrayList<String>() {{
        add("填空题1");
        add("填空题2");
        add("填空题3");
        add("填空题4");
        add("填空题5");
    }};
    private static final ArrayList<String> essayQuestions = new ArrayList<String>() {{
        add("问答题1");
        add("问答题2");
        add("问答题3");
        add("问答题4");
        add("问答题5");
    }};

    public static void main(String[] args) {
        // 计算题型权重之和
        double totalWeight = 0;
        for (double weight : questionTypeWeight.values()) {
            totalWeight += weight;
        }

        // 根据权重随机选题
        Random random = new Random();
        ArrayList<String> selectedQuestions = new ArrayList<String>();
        for (int i = 0; i < 10; i++) {
            double randomValue = random.nextDouble() * totalWeight;
            double sumWeight = 0;
            for (int questionType : questionTypeWeight.keySet()) {
                sumWeight += questionTypeWeight.get(questionType);
                if (randomValue <= sumWeight) {
                    String question = "";
                    switch (questionType) {
                        case SINGLE_CHOICE:
                            question = singleChoiceQuestions.get(random.nextInt(singleChoiceQuestions.size()));
                            break;
                        case MULTI_CHOICE:
                            question = multiChoiceQuestions.get(random.nextInt(multiChoiceQuestions.size()));
                            break;
                        case FILL_BLANK:
                            question = fillBlankQuestions.get(random.nextInt(fillBlankQuestions.size()));
                            break;
                        case ESSAY_QUESTION:
                            question = essayQuestions.get(random.nextInt(essayQuestions.size()));
                            break;
                    }
                    selectedQuestions.add(question);
                    break;
                }
            }
        }

        // 输出选中的题目
        System.out.println("选中的题目：");
        for (String question : selectedQuestions) {
            System.out.println(question);
        }
    }
}

上述代码中，我们定义了题型常量和题型对应的权重，并将题目存储在对应的 ArrayList 中。然后，我们计算题型权重之和，并根据权重随机选题，最后输出选中的题目。你可以根据自己的需求修改题型常量和题目，以及相应的权重，以实现你自己的考试系统。