1.项目成员

黄绍桦：201521123014
花雨芸：201521123102
码云地址：https://gitee.com/huangsh1/software_pair_programming
结对照片

2.改进现有代码

覆盖率统计截图

发现的问题：

简繁英的切换不完善（鼠标事件监听异常）
代码编码不规范
复习错题集不完善
统计率不正确

改进与扩展（需求分析）：

1）规范代码样式；
2）修正简繁英切换的问题；
3）修改界面左下角正确率显示不正确的问题。
4）加入乘方和括号的表达式
5）优化复习错题集

3.程序设计：针对新开发功能做设计，建议使用思维导图。

·思维导图

代码展示：展示每个功能的核心代码。

语言切换：
Simplified_Chinese.setText("简");
        Simplified_Chinese.addMouseListener(new java.awt.event.MouseAdapter() {
            public void mouseClicked(java.awt.event.MouseEvent evt) {
                Simplified_ChineseMouseClicked(evt);
            }
        });

        Traditional_Chinese.setText("/繁");
        Traditional_Chinese.addMouseListener(new java.awt.event.MouseAdapter() {
            public void mouseClicked(java.awt.event.MouseEvent evt) {
                Traditional_ChineseMouseClicked(evt);
            }
        });

        English.setText("/English");
        English.addMouseListener(new java.awt.event.MouseAdapter() {
            public void mouseClicked(java.awt.event.MouseEvent evt) {
                EnglishMouseClicked(evt);
            }
        });

创建答题历史记录和错题集：
    public void Histroy_create() {
        String path = "f:\\Myapp";
        File f = new File(path);
        if (!f.exists()) {
            f.mkdirs();
            String fileName = "histroy.txt";
            File file = new File(f, fileName);
            if (!file.exists()) {
                Writer writer = null;
                try {
                    writer = new OutputStreamWriter(new FileOutputStream(file), "UTF-8");
                } catch (UnsupportedEncodingException | FileNotFoundException e) {
                    e.printStackTrace();
                }
                try {
                    if (writer != null) {
                        writer.close();
                    }
                } catch (IOException e) {
                    e.printStackTrace();
                }
                
            }
            f.mkdirs();
            String fileName2 = "histroy_num.txt";
            File file2 = new File(f, fileName2);
            if (!file2.exists()) {
                Writer writer = null;
                try {
                    writer = new OutputStreamWriter(new FileOutputStream(file2), "UTF-8");
                } catch (UnsupportedEncodingException | FileNotFoundException e) {
                    e.printStackTrace();
                }
                try {
                    if (writer != null) {
                        writer.close();
                    }
                } catch (IOException e) {
                    e.printStackTrace();
                }

            }
            Histroy_saveNum();
        }

    }

    public void Histroy_save() {
        FileWriter writer;
        String fileName = ("f:\\Myapp\\histroy.txt");
        try {
            writer = new FileWriter(fileName, true);
            writer.write(str);
            writer.write("\r\n");
            writer.close();
        } catch (IOException e) {
            e.printStackTrace();
        }

    }

    public void Histroy_saveNum() {
        FileWriter writer2;
        String fileName2 = ("f:\\Myapp\\histroy_num.txt");
        try {
            writer2 = new FileWriter(fileName2, true);
            writer2.write(str2);
            writer2.write("\r\n");
            writer2.close();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

括号：
        for (int j = 0; j < leftNums; j++) {
                exp += "(";
            }
            
            if (exp.length() > leftNums && exp.charAt(exp.length() - leftNums - 1) == '^') {
                int matchPos = i + 1;
                for (int j = 0; j < leftNums; j++) {
                    exp = exp.substring(0, exp.length() - 1);
                    while (rightPosMap.get(matchPos) <= 0) {
                        matchPos++;
                    }
                    rightPosMap.put(matchPos, rightPosMap.get(matchPos) - 1);
                }
                exp += random.nextInt(4);
            } else {
                int generateNum = (random.nextInt(40) - 20);
                if (generateNum < 0 && (leftPosMap.get(i + 1) == 0 || rightPosMap.get(i + 1) == 0)) {
                    exp += "(" + generateNum;
                    rightPosMap.put(i + 1, rightPosMap.get(i + 1) + 1);
                } else {
                    exp += generateNum;
                }
            }
            int rightNums = rightPosMap.get(i + 1);
            for (int j = 0; j < rightNums; j++) {
                exp += ")";
            }

去除产生除0：
public static ArrayList<ExpAndAns> generateExps(int num) {
        HashSet<MinPreFormat> hashSet = new HashSet<>();
        ArrayList<ExpAndAns> res = new ArrayList<>();
        for (int i = 0; i < num; i++) {
            String exp = generateNewExp();
            String postexp = trans(exp);
            Node root = createExpTree(postexp);
            MinPreFormat minPreFormat = minPre(root);
            if (hashSet.contains(minPreFormat)) {
                i--;
            } else {
                Rational ans = calc(postexp);
                if (ans.getM_down() == 0) {
                    i--;
                } else {
                    hashSet.add(minPreFormat);
                    res.add(new ExpAndAns(exp, ans));
                }
            }
        }
        return res;
    }