一、介绍

本博客是对结对编程队友王同学编写的个人项目的分析评价，编写语言为java。

二、项目需求

用户：小学、初中、高中数学老师。

主要功能：输入用户名和密码登录，可以操作生成小初高数学卷子，题目不重复，保存在.TXT文件中。

题目要求：

三、代码分析

User类

import java.util.HashMap;
import java.util.List;

public class user {
    private String name;
    private String password;
    private String grade;

    public void setName(String name) {
        this.name = name;
    }
    public void setPassword(String password) {
        this.password = password;
    }
    public void setGrade(String grade) {
        this.grade = grade;
    }
    public String getName() {
        return name;
    }
    public String getPassword() {
        return password;
    }
    public String getGrade() {
        return grade;
    }
    public static HashMap<String, List<String>> userHashMap = new HashMap<>();

    static {
        userHashMap.put("张三1", List.of("123", "小学"));
        userHashMap.put("张三2", List.of("123", "小学"));
        userHashMap.put("张三3", List.of("123", "小学"));
        userHashMap.put("李四1", List.of("123", "初中"));
        userHashMap.put("李四2", List.of("123", "初中"));
        userHashMap.put("李四3", List.of("123", "初中"));
        userHashMap.put("王五1", List.of("123", "高中"));
        userHashMap.put("王五2", List.of("123", "高中"));
        userHashMap.put("王五3", List.of("123", "高中"));
    }

}

Paper类

import java.io.*;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.HashSet;
import java.util.Random;
import java.util.Scanner;
public class paper {
private int state;
public static String dir=".//";
public static String buf = "";
public void setState(int state) {
this.state = state;
}
static String getProblem(int state){
String[] symbol = new String[]{"+","-","*","/","^2","√","sin","cos","tan"};
Random r = new Random();
String problem = new String();
if(state == 1){
while (true){
problem = "";
int length = 0;
int kuohao = r.nextInt(3);
int left = 0;
int gap = 0;
while (true){
if(r.nextInt(2) == 0 && kuohao > 0){
problem += "(";
kuohao--;
left++;
gap = 0;
}
int number = r.nextInt(100)+1;
problem += String.valueOf(number);
gap++;
if(r.nextInt(2) == 0 && left > 0 && gap >= 2){
problem += ")";
left--;
}
if(length >= 2 && kuohao <= 0 && left <= 0){
break;
}
problem += symbol[r.nextInt(4)];
length++;
}
if(length < 5 && gap < 3){
break;
}
}
}
else if(state == 2){
while (true) {
problem = "";
int length = 0;
int sym = r.nextInt(2) + 1;
int kuohao = r.nextInt(2);
int left = 0;
int gap = 0;
while (true) {
if (r.nextInt(2) == 0 && kuohao > 0) {
problem += "(";
kuohao--;
left++;
gap = 0;
}
gap++;
int number = r.nextInt(100) + 1;
if (r.nextInt(2) == 0) {
if (r.nextInt(2) == 0) {
problem += (String.valueOf(number) + symbol[4]);
} else {
problem += (symbol[5] + String.valueOf(number));
}
sym--;
} else {
problem += String.valueOf(number);
}
if (r.nextInt(2) == 0 && left > 0 && gap >= 2) {
problem += ")";
left--;
}
if (length >= 2 && kuohao <= 0 && left <= 0) {
break;
}
problem += symbol[r.nextInt(4)];
length++;
}
if (length < 5 && gap < 5) {
break;
}
}
}
else if(state ==3){
while (true) {
problem = "";
int length = 0;
int sym = 1;
int sym2 = r.nextInt(3) + 1;
int kuohao = r.nextInt(3);
int left = 0;
int gap = 0;
while (true) {
if (r.nextInt(2) == 0 && kuohao > 0) {
problem += "(";
kuohao--;
left++;
gap = 0;
}
gap++;
int number = r.nextInt(100) + 1;
if (r.nextInt(3) == 0) {
if (r.nextInt(2) == 0) {
problem += (String.valueOf(number) + symbol[4]);
} else {
problem += (symbol[5] + String.valueOf(number));
}
sym--;
} else {
if(r.nextInt(2) == 0){
int symloc = r.nextInt(3)+6;
problem += (symbol[symloc] + String.valueOf(number));
sym2--;
}
else {
problem += String.valueOf(number);
}
}
if (r.nextInt(2) == 0 && left > 0 && gap >= 2) {
problem += ")";
left--;
}
if (length >= 2 && sym <= 0 && sym2 <= 0 && kuohao <= 0 && left <= 0) {
break;
}
problem += symbol[r.nextInt(4)];
length++;
}
if (length < 5 && gap < 5) {
break;
}
}
}
problem += "=";
return problem;
}
static HashSet<String> getPast(String name){
String path = dir+name;		//要遍历的路径
File file = new File(path);		//获取其file对象
if(!file.exists()){//如果没有该文件夹进行创建
file.mkdir();
}
File[] fs = file.listFiles();	//遍历path下的文件和目录，放在File数组中
HashSet<String> pastProblem= new HashSet<String>();
for(File f:fs) {                    //遍历File[]数组
if (!f.isDirectory())        //若非目录(即文件)，则读入
{
try {
BufferedReader br = new BufferedReader(new FileReader(f));
String line;
while ((line = br.readLine()) != null) {
// 一次读入一行数据并加入到结果的hashset中
pastProblem.add(line);
}
br.close();
} catch (Exception e) {
e.printStackTrace();
}
}
}
return pastProblem;
}
public void createF(user userInput)  {
while (true){
System.out.println("准备生成"+userInput.getGrade()+"题目，请输入生成题目数量：");
Scanner scanner = new Scanner(System.in);
buf = scanner.next();
try {
int num = Integer.parseInt(buf);
while(num < 10 || num > 30){
if(num == -1){
System.out.println("退出");
Main.state = 0;
return ;
}
else {
System.out.println("输入范围有误，请重新输入");
}
scanner = new Scanner((System.in));
num = scanner.nextInt();
}
String name = userInput.getName();
//state = userInput.getGrade();
HashSet<String> past = getPast(name);
String time = new SimpleDateFormat("yyyy-MM-dd-hh-mm-ss").format(new Date().getTime());
File file = new File(userInput.getName());
if(!file.exists()){
file.mkdir();
}
String path = file + "//" + time + ".txt";
try {
FileWriter fw = new FileWriter(path,true);
for(int i =0; i < num;i++){
String problem = getProblem(state);
if(!past.contains(problem)){
problem = String.valueOf(i+1) + "." + problem;
fw.write(problem + "/n" + "/n");
}
}
System.out.println("卷子生成完毕");
fw.close();
}
catch (IOException e) {
e.printStackTrace();
}
} catch (Exception e) {
return;
}
}
}
}

main

import javax.swing.*;
import java.util.List;
import java.util.Scanner;
public class Main {
public static int choice = 1;
public static int state = 0;
public static void main(String[] args) throws Exception {
user userNow = new user();
paper paperTmp = new paper();
while (true){
if(choice == 1){ //login
System.out.println("请输入用户名和密码：");
Scanner input = new Scanner(System.in);
String str[] = input.nextLine().split("//s+");
if(str.length < 2){
System.out.println("请输入正确的用户名、密码");
choice = 1;
continue;
}
String name = str[0];
String password = str[1];
if(user.userHashMap.containsKey(name) && user.userHashMap.get(name).contains(password)){
userNow.setName(name);
userNow.setGrade(user.userHashMap.get(name).get(1));
if(user.userHashMap.get(userNow.getName()).get(1) == "小学"){
state = 1;
}
if(user.userHashMap.get(userNow.getName()).get(1) == "初中"){
state = 2;
}
if(user.userHashMap.get(userNow.getName()).get(1) == "高中"){
state = 3;
}
paperTmp.setState(state);
paperTmp.createF(userNow);
choice = 2;
}
else { //cannot login
System.out.println("请输入正确的用户名、密码");
choice = 1;
continue;
}
}
else if(choice == 2){
Scanner inputChange = new Scanner(System.in);
String strChange = paper.buf;
if(strChange.equals("切换为小学")){
state = 1;
userNow.setGrade("小学");
}
else if(strChange.equals("切换为初中")){
state = 2;
userNow.setGrade("初中");
}
else if(strChange.equals("切换为高中")){
state = 3;
userNow.setGrade("高中");
}
else{
System.out.println("输入错误，请重新输入");
}
paperTmp.setState(state);
paperTmp.createF(userNow);
choice = 1;
}
if(state == 0){
userNow.setGrade(null);
userNow.setName(null);
choice = 1;
continue;
}
}
}
}

四、优缺点分析

优点

·类的封装性好 由于我使用的是c++设计，虽然相对简洁明了，但封装是没有java优越的，类逻辑很好有利于代码复用
·功能实现非常完美，简洁的操作界面
·使用哈希表查重，有数据结构的功底

缺点

·对java语言的使用不太规范，例如类名大写，拼音命名法
·几乎没有注释，对于他人阅读来说是一大困难