1.链接

• 学号：201521123076 博客链接：http://www.cnblogs.com/slickghost/p/8645842.html
• 学号：201521123078 博客链接：http://www.cnblogs.com/onetruck/p/8641053.html
• 结对编程码云项目链接：https://gitee.com/534160110/Arithmetic

2.改进现有代码

• 所选择的博客地址：http://www.cnblogs.com/shizhuangde
• 源代码：https://coding.net/u/lhl1212/p/work2/git

一、分析初始代码

类图

覆盖率统计

单元测试

所发现的不足之处

• 类没有注释，减少易读性
• 源程序中使用驼峰命名法，但是一些方法的命名有缺陷，如Fraction类中的creatfraction()，应改为createFraction()
• 不能让用户选择题目的数量
• 没有统计正确率
• 只有两个数之间的运算

二、功能改进与扩展

• 为每个类增加注释，修改不恰当的命名

  

• 重构Calculator类，增加calc()方法

  //Class Calculator       public static String calc(String op,Fraction a,Fraction b){           switch (op) {              case "+":                  System.out.println("+");                  return add(a,b);              case "-":                  return sub(a,b);              case "×":                  return mul(a,b);              case "÷":                  return div(a,b);              default :                  return null;              }       }

• 扩展了三位数之间的运算

  public static String createRandomOp(){     String operator = null;     Random random = new Random();     switch (random.nextInt(4)) {     case 0:         operator = "+";          break;     case 1:         operator = "-";         break;     case 2:         operator = "×";         break;     case 3:         operator = "÷";         break;     }     return operator; }    public class Createformula { public static int testNum = 5;  private String[] result = new String[testNum];  private String[] number_1 = new String[testNum];  private String[] number_2 = new String[testNum]; private String[] number_3 = new String[testNum]; private String[] operator1 = new String[testNum];  private String[] operator2 = new String[testNum];  private ArrayList
        
          scoresList = new ArrayList
         
          ();  private BufferedWriter writer; public Createformula() { } public void createTest() {     Random random = new Random();     Fraction f1 = new Fraction();     Fraction f2 = new Fraction();     Fraction f3 = new Fraction();     for (int i = 0; i < testNum; i++) {            f1.creatfraction();            f2.creatfraction();            f3.creatfraction();         number_1[i] = f1.getFraction();         number_2[i] = f2.getFraction();         number_3[i] = f3.getFraction();         operator1[i] = createRandomOp();         operator2[i] = createRandomOp();         Fraction temp = new Fraction();  //put the result of f1f2     if(operator1[i].equals("+")||operator1[i].equals("-") ){         temp.setFraction(Calculator.calc(operator2[i],f2,f3));         temp.convertResult();         result[i] = Calculator.calc(operator1[i],f1,temp);     }     else{         temp.setFraction(Calculator.calc(operator1[i],f1,f2));         temp.convertResult();         result[i] = Calculator.calc(operator2[i],temp,f3);     }     } }    //Class Fraction public  void convertResult(){     if(fraction != null){     if(fraction.contains("/")){         String str[] = fraction.split("/");         this.numerator = Integer.parseInt(str[0]);         this.denominator = Integer.parseInt(str[1]);             }     else{         this.numerator = Integer.parseInt(fraction);         this.denominator = 1;     } }     else System.out.println("fraction null"); }
         
        

• 增加用户选择题目数量功能

  //Class Background  public void setFormulaNum() {      String str;       str = JOptionPane.showInputDialog("请输入题目数量");       this.formulaNum = Integer.parseInt(str);  }

• 增加正确率统计功能

  //Class Background  public void actionPerformed(ActionEvent e) {          btnExit.addMouseListener(new MouseAdapter() {              @Override              public void mouseClicked(MouseEvent arg0) {                  // TODO Auto-generated method stub                  System.exit(0);              }          });          btnSubmit.addMouseListener(new MouseAdapter() {              @Override              public void mouseClicked(MouseEvent arg0) {                  // TODO Auto-generated method stub                  isEnd=!isEnd;                   for (int i = 0; i < formulaNum; i++) {                      answers[i]=tfdAnswer[i].getText();                    }                  wrong= background.checkAnswer(answers);                  String s=null;                  if(wrong.length==0)                      s=tips.get(5);                  else{                      s=tips.get(6)+"\n";                      String standardAnswer[]=new String[formulaNum];                      standardAnswer=background.getStandardAnswer();                      questions = background.getQuestions();                      for(int i=0;i

• 运行结果截图：

  

3.两人合作

一、编码规范

• 1.使用驼峰命名法
• 2.缩进：tab
• 3.类的开头注释

二、结对照片

三、码云提交记录

四、心得体会

结对编程确实能够带来1+1>2的效果，两个人互相讨论后各司其职，其中遇到问题互相帮助。