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<String> scoresList = new ArrayList<String>(); 
   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)+"
  ";
    					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+"
  
  
  ";
    						}
    					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。