一个简单的随机抽题系统，题库以文件的方式读入程序，功能是随机抽题并记录某题抽取次数。刚好有需要，给自己写了个，顺便开源。
没做UI界面。需要的同学自取即可。
使用时将questions.txt文件和src并列放到Project目录下，questions.txt文件就是题库文件。里面录入题干的格式是：
题目内容;0
注意是英文分号，以及末尾加上数字0代表共被抽取了0次。这个数字会在程序运行后更改。
未来可能会迭代带权重的随机抽题程序。
代码：
import java.io.BufferedReader; import java.io.FileReader; import java.io.FileWriter; import java.io.IOException; import java.util.HashMap; import java.util.Map; import java.util.Random; public class RandomQuestionPicker { private static final String FILE_PATH = "questions.txt"; private static final String SEPARATOR = ";"; public static void main(String[] args) { Map<String, Integer> questionCounts = readQuestionCountsFromFile(); if (questionCounts.isEmpty()) { System.out.println("题库为空！"); return; } String selectedQuestion = pickRandomQuestion(questionCounts); System.out.println("随机抽取的题目是：\n" + selectedQuestion); incrementQuestionCount(questionCounts, selectedQuestion); writeQuestionCountsToFile(questionCounts); } private static Map<String, Integer> readQuestionCountsFromFile() { Map<String, Integer> questionCounts = new HashMap<>(); try (BufferedReader reader = new BufferedReader(new FileReader(FILE_PATH))) { String line; while ((line = reader.readLine()) != null) { String[] parts = line.split(SEPARATOR); if (parts.length == 2) { String question = parts[0]; int count = Integer.parseInt(parts[1]); questionCounts.put(question, count); } } } catch (IOException e) { System.err.println("读取文件出错：" + e.getMessage()); } return questionCounts; } private static String pickRandomQuestion(Map<String, Integer> questionCounts) { Random random = new Random(); int randomNumber = random.nextInt(questionCounts.size()) + 1; int accumulatedWeight = 0; for (Map.Entry<String, Integer> entry : questionCounts.entrySet()) { accumulatedWeight += 1; if (randomNumber == accumulatedWeight) { return entry.getKey(); } } return null; } private static void incrementQuestionCount(Map<String, Integer> questionCounts, String question) { int count = questionCounts.getOrDefault(question, 0); questionCounts.put(question, count + 1); } private static void writeQuestionCountsToFile(Map<String, Integer> questionCounts) { try (FileWriter writer = new FileWriter(FILE_PATH)) { for (Map.Entry<String, Integer> entry : questionCounts.entrySet()) { writer.write(entry.getKey() + SEPARATOR + entry.getValue() + "\n"); } } catch (IOException e) { System.err.println("写入文件出错：" + e.getMessage()); } } }
运行：
