三次大作业总结
一.分析与总结
这三次大作业我完成的情况并不好，整体得分情况都很差劲，甚至离及格都相差好远，总结反思之后，发现在我的学习代码的过程中存在诸多问题。在习题结束后，我深刻总结了代码得分情况不尽人意的原因，并且在和同学的交流过程中，得到了新的理解和体会，为弥补之前所学知识的漏洞，巩固所学知识，更好进行下一阶段的学习，对前三次大作业出现的问题做出以下总结：
1.第一次大作业
第一次作业是设计。实现答题程序，模拟一个小型的测试。第一次很简单，只用到了三个类，题目类，试卷类，答卷类，整体思路是通过一排排输入，即input.nextLine()来输入，每一行就相当于是一个类，当检测到哪一行字符串是“end”得时候就结束。由于第一次大作业很简单，没有错误格式得测试，并且第一行还输入要输入几个题目得数字，即将每行代码用split拆分一下，再分别将拆分出来得数据存入类里，最后再遍历题目和答案，看是否相同，相同输出true，不相同输出false。由于第一次大作业很简单，所以只用了100多行代码就解决了。
2.第二次大作业
第二次大作业同样是答卷类作业，但是多了一个分数类，即每一题赋予了一个分值，判断每一题对错得时候要给每一题得得分赋分，最后输出，在这里我用了一个sco数组去存储每一题得分数，最后用循环printf出每一题得分数，总分则用totalsco分别加上对的题目的分数。另外分数类答卷不止一个这里要加一个循环。还要考虑answer is null的情况，即答案比题目少的情况，如果这个题目没有匹配到对应的答案，则输出answer is null。这里我用了一个整型n，每循环一次赋分的map就加一，然后每次都和answer类MAP的size做对比，当对应的题目没有answer时，其对应的size，即n就会大于answer的size，即后面都输出answer is null。
3.第三次大作业
第三次大作业难度更大了，主要是复杂程度大大增加。不仅新加了两个类，一个学生信息类，一个删除类，而且考虑的情况也更多了，比如增加了wrong format的输入，这里就要求要用到正则表达式去检验格式，并且每一行的输入情况可能有多种，就比如答卷类，它可能是wrong format 也可能是answer is null 所以我用了两个正则表达式去检验两种情况，先检验是不是answer is null，再检验是不是wrong format，其他类一样，都要用到相应的正则表达式，而且这次的正则表达式的运用与前面大不相同，属于是天差地别，为此我特意去网上搜索查询并且不停的询问自己的室友，最后才确定了每个类的正则表达式。这是难点1。难点2就是要想到遍历的顺序，从哪开始遍历，我的设计思路是先从赋分类开始遍历，即#T：类开始，先遍历问题类，即#N：类，再遍历#S：类，即答卷类，它的难点在于每一题有四种情况，即“answer is null”，“题目不存在”，“题目被删除”，“题目true or false”，这四种情况有优先级，并且还要设计一个比较复杂的算法去判断，当判断到优先级最高的则continue，直接把后面的判断省去。最后的输出我也是用一个数组sco去记录每一题的得分，用循环输出出来，并且在算法判断的时候我用了一个类去实现所有的计算功能，并在这个类里开了所有类的数组用来遍历，把这些类分别放到对应的数组里。来依次遍历。还有一点就是用到map的遍历。对应的题号与分值存入map，对应的题号与答案存入map，到第三次作业我就用了400行代码。
总结：因为是第一次写大作业集，所以感觉老师布置的作业难度是不大的，所以总是以一种漫不经心的态度来对待这些作业，大作业发布后总是拖拉，开始写代码的时间总是一拖再拖，导致在完成作业时时间紧张，再加上对所学内容的掌握也并不熟练，在运用过程中问题重重，使得最终得分很低，排名情况也就不尽人意，并且在每次大作业结束后缺乏对之前问题的总结归纳，导致问题越积越多。
二.设计检查
1.第一次大作业
import java.util.*;
class Question
{
private int number;
private String content;
private String standardAnswer;
public Question(int number, String content, String standardAnswer)
{
this.number = number;
this.content = content;
this.standardAnswer = standardAnswer;
}
public int getNumber()
{
return number;
}
public String getContent()
{
return content;
}
public String getStandardAnswer()
{
return standardAnswer;
}
public boolean checkAnswer(String answer)
{
return standardAnswer.equals(answer);
}
}
class ExamPaper
{
private List
public void addQuestion(Question question)
{
questions.add(question);
}
public Question getQuestionByNumber(int number)
{
for (Question question : questions)
{
if (question.getNumber() == number)
{
return question;
}
}
return null;
}
}
class AnswerSheet
{
private ExamPaper examPaper;
private List
private List
public AnswerSheet(ExamPaper examPaper)
{
this.examPaper = examPaper;
}
public void addAnswer(String answer)
{
answers.add(answer);
}
public void gradeAnswers()
{
for (int i = 0; i < answers.size(); i++)
{
String answer = answers.get(i);
Question question = examPaper.getQuestionByNumber(i + 1);
if (question != null)
{
boolean result = question.checkAnswer(answer);
results.add(result);
}
}
}
public void printResults()
{
for (int i = 0; i < answers.size(); i++)
{
Question question = examPaper.getQuestionByNumber(i + 1);
if (question != null)
{
System.out.println(question.getContent().replace("#Q:", "") + "~" + answers.get(i));
}
}
for (boolean result : results)
{
System.out.print(result);
}
}
}
public class Main
{
public static void main(String[] args)
{
Scanner scanner = new Scanner(System.in);
int questionCount = Integer.parseInt(scanner.nextLine());
ExamPaper examPaper = new ExamPaper();
for (int i = 0; i < questionCount; i++)
{
String line = scanner.nextLine();
String[] parts = line.split(" ");
int number = Integer.parseInt(parts[0].replace("#N:", ""));
String content = parts[1].replace("#Q:", "");
String standardAnswer = parts[2].replace("#A:", "");
Question question = new Question(number, content, standardAnswer);
examPaper.addQuestion(question);
}
AnswerSheet answerSheet = new AnswerSheet(examPaper);
while (scanner.hasNextLine())
{
String line = scanner.nextLine();
if (line.equals("end"))
{
break;
}
String answer = line.replace("#A:", "");
answerSheet.addAnswer(answer);
}
answerSheet.gradeAnswers();
answerSheet.printResults();
}
}
2.第二次大作业：
import java.util.*;
class Question
{
private int number;
private String content;
private String standardAnswer;
public Question(int number, String content, String standardAnswer)
{
this.number = number;
this.content = content;
this.standardAnswer = standardAnswer;
}
public int getNumber()
{
return number;
}
public String getContent()
{
return content;
}
public String getStandardAnswer()
{
return standardAnswer;
}
public boolean checkAnswer(String answer)
{
return standardAnswer.equals(answer);
}
}
class ExamPaper
{
private List
public void addQuestion(Question question)
{
questions.add(question);
}
public Question getQuestionByNumber(int number)
{
for (Question question : questions)
{
if (question.getNumber() == number)
{
return question;
}
}
return null;
}
}
class AnswerSheet
{
private ExamPaper examPaper;
private List
private List
public AnswerSheet(ExamPaper examPaper)
{
this.examPaper = examPaper;
}
public void addAnswer(String answer)
{
answers.add(answer);
}
public void gradeAnswers()
{
for (int i = 0; i < answers.size(); i++)
{
String answer = answers.get(i);
Question question = examPaper.getQuestionByNumber(i + 1);
if (question != null)
{
boolean result = question.checkAnswer(answer);
results.add(result);
}
}
}
public void printResults()
{
for (int i = 0; i < answers.size(); i++)
{
Question question = examPaper.getQuestionByNumber(i + 1);
if (question != null)
{
System.out.println(question.getContent().replace("#Q:", "") + "~" + answers.get(i));
}
}
for (boolean result : results)
{
System.out.print(result);
}
}
}
public class Main
{
public static void main(String[] args)
{
Scanner scanner = new Scanner(System.in);
int questionCount = Integer.parseInt(scanner.nextLine());
ExamPaper examPaper = new ExamPaper();
for (int i = 0; i < questionCount; i++)
{
String line = scanner.nextLine();
String[] parts = line.split(" ");
int number = Integer.parseInt(parts[0].replace("#N:", ""));
String content = parts[1].replace("#Q:", "");
String standardAnswer = parts[2].replace("#A:", "");
Question question = new Question(number, content, standardAnswer);
examPaper.addQuestion(question);
}
AnswerSheet answerSheet = new AnswerSheet(examPaper);
while (scanner.hasNextLine())
{
String line = scanner.nextLine();
if (line.equals("end"))
{
break;
}
String answer = line.replace("#A:", "");
answerSheet.addAnswer(answer);
}
answerSheet.gradeAnswers();
answerSheet.printResults();
}
}
3.第三次大作业
public class Main {
public static void main(String[] args) {
Scanner scanner = new Scanner(System.in);
LinkedList<Student> student = new LinkedList<>();
LinkedList<AnswerPaper[]> answer = new LinkedList<>();
LinkedList<Boolean> judgeToAnswer = new LinkedList<>();
LinkedList<String[]> list = new LinkedList<>();
}
}
class Tool {
public static void processingString(LinkedList<String[]> allInformation, String str) {}
public static void manageLinkQuestion(LinkedList<String[]> list) {}
public static void manage100points(String[] element) {}
public static void manageToStudent(LinkedList<String[]> list, LinkedList<Student> student) {}
public static void manageToDelete(LinkedList<String[]> list) {}
public static String[] find_S_Answer(LinkedList<String[]> list) {}
public static String[] find_T_TestPaper(LinkedList<String[]> list, String temp) {}
public static int manageIsOrNo(LinkedList<String[]> list) {}
public static void manageConsist(LinkedList<String[]> list, LinkedList<Student> student,
LinkedList<AnswerPaper[]> answer, LinkedList<Boolean> judgeToAnswer) {}
public static void judgmentQuestion(LinkedList<String[]> list, LinkedList<Student> student,
LinkedList<AnswerPaper[]> answer, LinkedList<Boolean> judgeToAnswer) {}
}
class AnswerPaper {// 答卷类，判题结果将在这里产生
private int num = 1;
private String student_Answer;
private int mark = 0;
private boolean judge = false;
private String studentID;
private String studentName;
private boolean key = true;
public static TestPaper allProblems = new TestPaper();
public AnswerPaper(int num, String student_Answer, int mark, String studentID, String studentName) {}
public void setKey() {}
public String judgeToAnswer() {}
public int getMark() {}
public boolean matchIDandName() {}
public String getStudentID() {}
public void setStudentID(String studentID) {}
public String getStudentName() {}
public void setStudentName(String studentName) {}
public String get_A() {}
public void setNum(int num) {}
public AnswerPaper() {}
}
class TestPaper {// 试卷类，将存储所有题目，
private int num = 1;
public Topic[] questions;
public void setNum(int num) {}
public TestPaper() {}
public void set_Q_and_A(int i, String num, String question, String standardAnswer) {}
public String getTestPaperAnswer(int count) {}
public void deleteQuestion(String count) {}
public String getAllQuestion(int count) {}
}
class Topic {// 单独存储一个题目的类
private String num;
private String question;
private String standardAnswer;
private boolean condition = true;
public Topic() {}
public Topic(String num, String question, String standardAnswer) {}
public boolean getCondition() {}
public void setCondition(boolean condition) {}
public String getStandarAnswer() {}
public String getQuestion() {}
public String getNum() {}
}
class Student {
private String ID;
private String name;
public Student() {}
public Student(String ID, String name) {}
public String getID() {}
public void setID(String ID) {}
public String getName() {}
public void setName(String name) {}
}