任务描述：基于模板的文档产生、基于复用的软件构造 (1) 生成Word格式的习题， 口算习题练习得分的可视化展示，给出java代码

以下是一个简单的Java示例代码，用于生成口算习题和计算得分，并将得分可视化展示：

import java.io.File;
import java.io.FileOutputStream;
import java.util.ArrayList;
import java.util.List;
import java.util.Random;

import org.apache.poi.xwpf.usermodel.*;

public class ExercisesGenerator {

    public static void main(String[] args) {
        // 生成习题
        int maxNum = 100;
        int numCount = 10;
        String[] operators = {"+", "-", "*", "/"};
        List<String> questions = new ArrayList<>();
        List<Integer> answers = new ArrayList<>();
        Random random = new Random();
        for (int i = 0; i < numCount; i++) {
            int num1 = random.nextInt(maxNum) + 1;
            int num2 = random.nextInt(maxNum) + 1;
            String operator = operators[random.nextInt(4)];
            int result = 0;
            switch (operator) {
            case "+":
                result = num1 + num2;
                break;
            case "-":
                result = num1 - num2;
                break;
            case "*":
                result = num1 * num2;
                break;
            case "/":
                result = num1 / num2;
                break;
            }
            questions.add((i+1) + ". " + num1 + " " + operator + " " + num2 + " = ____");
            answers.add(result);
        }
        // 生成Word文档
        try {
            XWPFDocument doc = new XWPFDocument();
            XWPFParagraph title = doc.createParagraph();
            title.setAlignment(ParagraphAlignment.CENTER);
            XWPFRun run = title.createRun();
            run.setText("口算习题");
            run.setBold(true);
            run.setFontSize(16);
            run.addBreak();
            for (int i = 0; i < numCount; i++) {
                XWPFParagraph para = doc.createParagraph();
                para.setAlignment(ParagraphAlignment.LEFT);
                XWPFRun qRun = para.createRun();
                qRun.setText(questions.get(i));
                qRun.setFontSize(12);
                para.setSpacingAfter(150);
            }
            XWPFParagraph scorePara = doc.createParagraph();
            scorePara.setAlignment(ParagraphAlignment.CENTER);
            XWPFRun scoreRun = scorePara.createRun();
            scoreRun.addBreak();
            scoreRun.setText("得分：____ 分");
            scoreRun.setFontSize(12);
            // 计算得分
            int score = 0;
            for (int i = 0; i < numCount; i++) {
                int answer = answers.get(i);
                System.out.println("请输入第" + (i+1) + "题的答案：");
                int userAnswer = new java.util.Scanner(System.in).nextInt();
                if (userAnswer == answer) {
                    score++;
                }
            }
            // 可视化展示得分
            scoreRun.setText("得分：" + score + " 分");
            scoreRun.setColor("FF0000");
            FileOutputStream out = new FileOutputStream(new File("Exercises.docx"));
            doc.write(out);
            out.close();
            System.out.println("习题已生成，得分为：" + score + " 分");
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}

以上代码使用了Apache POI库，生成了一个包含口算习题和得分的Word文档。具体实现过程包括：定义习题内容和参数，生成习题，创建Word文档，设置文本样式和排版，将习题内容插入文档，计算得分并可视化展示，保存文档到指定位置。