20165205 2017-2018-2 "Java programming" a first week summary of pair programming

20165205 2017-2018-2 "Java programming" a first-week summary of requirements analysis

The calculation of the input formula requires that the condition be met:

1. Integer operations such as 2+5,47+7865 are supported.
2. Supports multi-operator operations, such as 6/9+4/9,4+7*9.
3. Supports fractional operations (true fractions), such as 3/4.
4. High correct rate
5. have input prompt
6. Ability to handle illegal input (return exception)

Expansion requirements:

1. Support automatic generation of topics

2. Multi-lingual support

   Design ideas
3. Writing the main classArithmetic4

4. Write the ArithmeticFunc class to implement the calculation, including: Add, subtract, multiply, divide, Zhifang, prescribe the method, also contains the method that throws the exception.

Core code and comments

1. To calculate the content, take the addition method as an example:

   public void Add (String s)//addition {string[] Str=s.split ("\\+");        if (Str[0].indexof ("/") >-1 | | str[1].indexof ("/") >-1)//score {string[] Str1=str[0].split ("[/]");        String[] Str2=str[1].split ("[/]"); if (Integer.parseint (str1[1])! = 0 && integer.parseint (str2[1])! = 0)//denominator not zero {result =simplefrac tion (((Integer.parseint (str1[0) *integer.parseint (str2[1]) + (Integer.parseint (str2[0]) *integer.parseint (str1[1        ])), (Integer.parseint (str1[1]) *integer.parseint (str2[1])); }else{throw new IllegalArgumentException ("Divisor cannot be zero!"); /divisor is zero throw exception}} else{//integer if (integer.parseint (str[0]) <1000&&integer.parseint (str[1]) <100 0&&integer.parseint (Str[0]) >-1000&&integer.parseint (str[1]) >-1000) {result = Inte        Ger.parseint (Str[0]) +integer.parseint (str[1]) + ""; } else{throw new IllegalArgumentException ("overrun!");} Throw exception when value range exceeds}} 

3. Throw exception operator: Take subtraction as an example

       if(s.indexOf("-")>-1){        int i=s.indexOf("-");        if(s.indexOf("-",i+1)==i+1){            throw new IllegalArgumentException("Input error! Don‘t like 1--1");//格式错误时抛出异常        }else{            substract(s);        }

Test method

Code hosting reviews for pair of small partners

• Pair of partners: 20165233 Zhang Yuxin
• I've been talking to my partner for a long time. The design of the code, after learning the teacher for the stack of code to get some inspiration, so write out the first frame, the different operators to filter, and then for the different operators to do the operation, so that the completion of this code.

PSP Table

Psp	Personal Software Process Stages	Estimated time-consuming (minutes)	Actual time elapsed (minutes)
Planning	Plan	30	45
Estimate	Estimate how long this task will take	180	180
Development	Development	100	130
Analysis	Demand analysis (including learning new technologies)	130	140
Design Spec	Creating a design Document	100	65
Design Review	Design Review (and colleagues review design documents)	30	20
Coding Standard	Code specification (to develop appropriate specifications for current development)	20	40
Design	Specific design	50	60
Coding	Specific code	45	30
Code Review	Code review	15	15
Reporting	Report	60	90
Test Report	Test report	30	45
Postmortem & Process Improvement Plan	Summarize afterwards and propose process improvement plan	10	25
	Total	880	985

Feelings

For this pair to write code, I feel the 1+1>2 feeling, in the process of writing code two people can timely rewrite the incorrect code, and can get new ideas, and make our code more perfect, more rigorous. At the same time also can find their own knowledge of loopholes, to supplement, really is wonderful AH.

20165205 2017-2018-2 "Java programming" a first week summary of pair programming