软件工程网络15结对编程1——四则运算优化

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<wrong.length;i++){
  s=s+questions[new Integer(wrong[i])-1]+standardAnswer[new Integer(wrong[i])-1];
  s=s+"\n\n\n";
  }
  s = s + tips.get(7)+
  String.valueOf(background.getRightAnswer()*100/background.testNum) +"%";
  }

  JOptionPane.showMessageDialog(null, s, "错题",JOptionPane.PLAIN_MESSAGE);;
  }

  });

• 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。