20165232 "Java Programming" Experiment 3 (Agile Development and XP Practice) Experiment Report
lab report cover
Instructor: Lou Jiapeng Experiment Date: April 30, 2018
Experiment Time: 15:45 - 17:20
Experiment Number: Experiment 3
Experiment Name: Agile Development and XP Practice
Experiment content:
- Refer to http://www.cnblogs.com/rocedu/p/6371315.html#SECCODESTANDARD to install the alibaba plugin to solve the specification problem in the code.
Use the tool (Code->Reformate Code) in IDEA to reformat the following code, and then study the Code menu to find a function that makes you feel the best. Submit a screenshot and add your student ID watermark.
- Add your learning partner to your own project on the code cloud. After confirming that the partner's project is added to yourself, download the Complex code of partner experiment 2, add no less than three JUnit unit test cases, and git add .; git after the test is successful commit -m "Add content to your student number"; git push;
- Complete the refactoring exercises, download your partner's code, perform at least three refactorings, submit a screenshot of the refactored code, and add your own student ID watermark. Submit your partner's code cloud project link.
- Refer to http://www.cnblogs.com/rocedu/p/6683948.html to complete the learning of Java cryptography related content in pairs, combining refactoring, git, and code standards .
Experimental procedure
(1) alibaba plugin and Code menu
Move Line/statement Down/Up: Move a line or expression down or up one line
Surround with: wrap statements with try-catch, for, if, etc.
comment with line/block comment: Turn the selected area into a comment
show reformat file dialog: automatically align according to the format
Optimize imports: optimize imports
Insert Live Template: Insert Live Template abbreviation
(2) Complex code to add test cases
pairing partner code
import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.PrintStream;
import java.util.Random;
import java.util.Scanner;
public class SizeYunsuan {
/**
* @param args
*/
public static Random rand=new Random();
public static class Qst
{
static int Operand(int Range)//产生操作数
{
int Opd=rand.nextInt(Range*2+1)-Range;
return Opd;
}
public static char OperatorKind(char Operator)//生成运算符
{
int OperatorPossible=rand.nextInt(3);
switch(OperatorPossible)
{
case 0:
Operator='+';
break;
case 1:
Operator='-';
break;
case 2:
Operator='*';
break;
default:
System.out.print("Error!");
}
return Operator;
}
public static boolean IfRepeated(String str[],int Location)//判断是否重复
{
for(int i=0;i<Location;i++)
{
if(str[i].equals(str[Location]))
return true;
}
return false;
}
public static int Ans(int ans,int Operand1,int Operand2,char Operator)//生成答案
{
switch(Operator)
{
case '+':
ans=Operand1+Operand2;
break;
case '-':
ans=Operand1-Operand2;
break;
case '*':
ans=Operand1*Operand2;
break;
default:
System.out.print("Error!");
}
return ans;
}
//生成一道运算题
public static void CreateStr(int Range,char Operator,String str[],int i,int QstNum,int ans[])
{ int answer = 0;
Qst.OperatorKind(Operator);
int Operand1=Qst.Operand(Range);
int Operand2=Qst.Operand(Range);
str[i]=Integer.toString(Operand1);
str[i]+=Operator;
str[i]+=Integer.toString(Operand2);
str[i]+="=";
while(IfRepeated(str,i))//判断是否重复
{
Operand1=Qst.Operand(Range);
Operand2=Qst.Operand(Range);
str[i]=Integer.toString(Operand1);
str[i]+=Operator;
str[i]+=Integer.toString(Operand2);
str[i]+="=";
}
ans[i]=Qst.Ans(answer,Operand1,Operand2,Operator);
}
public static void Display(String str[])//输出生成的运算题
{
for(int j=0;j<str.length;j++)
{
System.out.print(str[j]);
if(j%4==3)
{
System.out.println();
}
else
{
System.out.print('\t');
}
}
}
public static void Writefile(String str[],String filePath){
try {
File file = new File(filePath);
PrintStream ps = new PrintStream(new FileOutputStream(file));
for(int j=1;j<str.length;j++){
ps.println(j+"、"+str[j]);// 往文件里写入字符串
}
} catch (FileNotFoundException e) {
// TODO: handle exception
e.printStackTrace();
}
}
public static void Input(int Input[],int QstNum)//输入问题答案
{
Scanner sca=new Scanner(System.in);
for(int j=0;j<QstNum;j++)
{
Input[j]=sca.nextInt();
}
}
public static void OutAns(int ans[],int QstNum)//输出答案
{
for(int j=0;j<QstNum;j++)
{
System.out.print(ans[j]);
if(j%4==3)
{
System.out.println();
}
else
{
System.out.print('\t');
}
}
}
public static void ConfirmAns(int ans[],int Input[],int QstNum,int count)
{ int a[] = new int[QstNum];
count=0;
for(int i=0;i<QstNum;i++)
{
if(ans[i]==Input[i]){
count++;
a[i]=i;
}else{
a[i]=-1;
}
}
try {
File file = new File("D:\\Grade.txt");
PrintStream ps = new PrintStream(new FileOutputStream(file));
System.out.print("Correct:");
ps.print("Correct:");
System.out.print(count);
ps.print(count);
System.out.print("(");
ps.print("(");
for(int i=0;i<a.length;i++){
if(a[i]!=-1){
System.out.print(i+1+",");
ps.print(i+1+",");
}
}
System.out.println(")");
ps.println(")");
System.out.print("Wrong：");
ps.print("Wrong：");
System.out.print(QstNum-count);
ps.print(QstNum-count);
System.out.print("(");
ps.print("(");
for(int i=0;i<a.length;i++){
if(a[i]==-1){
System.out.print(i+1+",");
ps.print(i+1+",");
}
}
System.out.println(")");
ps.println(")");
} catch (FileNotFoundException e) {
// TODO: handle exception
}
}
}
public static void main(String[] args) {
// TODO Auto-generated method stub
int Range,QstNum=0,count=0;
char Operator = '+';
Scanner sca=new Scanner(System.in);
System.out.println("请输入生成题目的数量:");
QstNum=sca.nextInt();
System.out.println("请输入算数范围:");
Range=sca.nextInt();
String str[] = new String[QstNum];
int ans[]=new int[QstNum];
int Input[]=new int[QstNum];
for( int i=0;i<QstNum;i++)
{
try
{
Qst.CreateStr(Range,Qst.OperatorKind(Operator),str,i,QstNum,ans);
}
catch(Exception e)
{
i--;
};
}
Qst.Display(str);
String filePath;
filePath="D:\\Exercises.txt";
Qst.Writefile(str, filePath);
System.out.println();
System.out.println("输入答案：");
Qst.Input(Input, QstNum);
System.out.println("正确答案：");
Qst.OutAns(ans,QstNum);
System.out.println();
Qst.ConfirmAns(ans,Input,QstNum,count);
}
}Screenshot of running through
Screenshot of partner project git log
(3) Refactoring
- Rename can rename classes, packages, methods, and variables to increase code readability.
- Refactor->Encapsulate Field... used to encapsulate member variables
- Source->Generate toString()... used to generate a toString method
(4) Complete the learning of Java cryptography in pairs
The encryption process of the Caesar cipher can be recorded as the following transformation:
c≡m+k mod n (where n is the number of basic characters)
Likewise, the decryption process can be expressed as:
m≡c+k mod n (where n is the number of basic characters)
After refactoring, set Code and Rename to Caesar, and assign an initial value of 0 to p
Experimental experience
Through this experiment, I understood the importance of code standardization, and also learned some basic standard code operations.
PSP
| step | time consuming | percentage |
|---|---|---|
| demand analysis | 25min | 8% |
| design | 75min | 25% |
| Code | 150min | 50% |
| test | 12.5min | 4% |
| analysis Summary | 37.5min | 13% |