diff --git a/大作业/Date.cpp b/大作业/Date.cpp
index 1abe538..7812307 100644
--- a/大作业/Date.cpp
+++ b/大作业/Date.cpp
@@ -11,10 +11,12 @@ Date::Date(const tm &_time) : isAny(false) {
 }
 
 void Date::setNewDate(const time_t &newTime) {
+    this->isAny = false;
     this->time = newTime;
 }
 
 void Date::setNewDate(const tm &newTime) {
+    this->isAny = false;
     tm temp = newTime;
     this->time = mktime(&temp);
 }
@@ -29,6 +31,9 @@ time_t Date::getTime() const {
 }
 
 std::string Date::toString() const {
+    if (this->isAny) {
+        return "[Any]";
+    }
     char buffer[20];
     strftime(buffer, 20, "%F", localtime(&this->time));
     return std::string(buffer);
diff --git a/大作业/ListDisplay.cpp b/大作业/ListDisplay.cpp
index 77b5dc1..5958799 100644
--- a/大作业/ListDisplay.cpp
+++ b/大作业/ListDisplay.cpp
@@ -1,21 +1,75 @@
 #include "ListDisplay.hpp"
 #include "Exceptions.hpp"
+#include "Tools.hpp"
+#include <iomanip>
 
-ListDisplay::ListDisplay(const List<BaseRecord> &_allRecords)
-    : allRecords(_allRecords), fromDate(), toDate(), recordNumPerPage(20),
-      currentPage(1), totalPage(allRecords.length() / recordNumPerPage + 1),
-      sortOrder(ASCENT), sortByProp(RecordID){};
+ListDisplay::ListDisplay(const List<BaseRecord *> &_allRecordsPtrList)
+    : allRecordsPtrList(_allRecordsPtrList), fromDate(), toDate(),
+      searchForStu(), recordNumPerPage(20), currentPageIndex(0),
+      maxPageIndex(allRecordsPtrList.length() / recordNumPerPage),
+      sortOrder(ASCENT), sortByProp(RecordID),
+      tableTitleRow(
+          "│ " + setMiddle("Record ID", recordDisplayRowSize.recordID) + " │ " +
+          setMiddle("Date", recordDisplayRowSize.date) + " │ " +
+          setMiddle("Course Name", recordDisplayRowSize.courseName) + " │ " +
+          setMiddle("Stud. ID", recordDisplayRowSize.studentID) + " │ " +
+          setMiddle("Stud. name", recordDisplayRowSize.studentName) + " │ " +
+          setMiddle("Type", recordDisplayRowSize.type) + " │") {
+    this->filteredRecordsPtrList =
+        allRecordsPtrList.filtered([](BaseRecord *const &) { return true; });
+};
 
 bool ListDisplay::hasNext() {
-    return currentPage < totalPage;
+    return currentPageIndex < maxPageIndex;
 }
 
 bool ListDisplay::hasPrev() {
-    return currentPage > 1;
+    return currentPageIndex > 0;
 }
 
 void ListDisplay::displayNext() {
     if (!this->hasNext()) {
-        throw(PageIndexError("No next Page!"));
+        throw(PageIndexError("No next page!"));
+    }
+    this->currentPageIndex++;
+    this->display();
+}
+
+void ListDisplay::displayPrev() {
+    if (!this->hasPrev()) {
+        throw(PageIndexError("No prev page!"));
+    }
+    this->currentPageIndex--;
+    this->display();
+}
+
+void ListDisplay::display() {
+    bool brightBG = true;
+    std::cout << setoutputcolor(ConsoleColorTool::blue) << " Search date: from "
+              << resetOutputColor << this->fromDate.toString()
+              << setoutputcolor(ConsoleColorTool::blue) << " to "
+              << resetOutputColor << this->toDate.toString();
+    std::cout << "    ";
+    std::cout << setoutputcolor(ConsoleColorTool::blue)
+              << "Search for student: ID: " << resetOutputColor
+              << this->searchForStu.getNumberString()
+              << setoutputcolor(ConsoleColorTool::blue)
+              << " Name: " << resetOutputColor << this->searchForStu.getName()
+              << "\n";
+    // std::cout << setbgcolor(ConsoleColorTool::cyan);
+    std::cout << this->tableTitleRow << std::endl;
+    Iterator<BaseRecord *> iter = this->filteredRecordsPtrList.iterate(
+        this->currentPageIndex * this->recordNumPerPage);
+    int i = recordNumPerPage;
+    while (i > 0 && iter) {
+        if (brightBG) {
+            std::cout << setbgcolor(ConsoleColorTool::lightGray);
+        }
+        iter.next()->display();
+        if (brightBG) {
+            std::cout << resetOutputColor;
+        }
+        brightBG = !brightBG;
+        i--;
     }
 }
\ No newline at end of file
diff --git a/大作业/ListDisplay.hpp b/大作业/ListDisplay.hpp
index b7486ee..6a545ad 100644
--- a/大作业/ListDisplay.hpp
+++ b/大作业/ListDisplay.hpp
@@ -15,19 +15,21 @@ enum SortBy {
 
 class ListDisplay {
 private:
-    const List<BaseRecord> &allRecords;
-    List<BaseRecord> filteredRecords;
+    const List<BaseRecord*> &allRecordsPtrList;
+    List<BaseRecord*> filteredRecordsPtrList;
     Date fromDate;
     Date toDate;
+    Student searchForStu;
     int recordNumPerPage;
-    int currentPage;
-    int totalPage;
+    // The current page index, starting from 0
+    int currentPageIndex;
+    int maxPageIndex;
     bool sortOrder;
     SortBy sortByProp;
+    const std::string tableTitleRow;
 
 public:
-    ListDisplay() = delete;
-    ListDisplay(const List<BaseRecord> &_allRecords);
+    ListDisplay(const List<BaseRecord*> &_allRecordsPtrList);
     bool hasNext();
     bool hasPrev();
     void displayNext();
diff --git a/大作业/ListE.hpp b/大作业/ListE.hpp
index 8eaaa7a..9a082c4 100755
--- a/大作业/ListE.hpp
+++ b/大作业/ListE.hpp
@@ -33,9 +33,6 @@ public:
     // Swap the element located at index a and b. Throws IndexError if the given
     // index is beyond length of the list.
     List<E> &swap(int index_a, int index_b);
-    // Sort this list.
-    List<E> &
-    sort(std::function<bool(const E &, const E &)> const &isCorrectOrderFunc);
     E &operator[](const int index);
     const E &operator[](const int index) const;
     List<E> &operator=(const List<E> &otherList);
@@ -51,10 +48,15 @@ public:
     // Only retain item that matches the isTargetFunc
     List<E> &filter(std::function<bool(const E &)> const &isTargetFunc);
     // Returns a new filtered list.
-    List<E> filtered(std::function<bool(const E &)> const &isTargetFunc);
+    List<E> filtered(std::function<bool(const E &)> const &isTargetFunc) const;
+    // Sort this list.
+    List<E> &
+    sort(std::function<bool(const E &, const E &)> const &isCorrectOrderFunc);
     // Returns a sorted NEW list.
     const List<E> sorted(std::function<bool(const E &, const E &)> const
                              &isCorrectOrderFunc) const;
+    Iterator<E> &&iterate();
+    Iterator<E> &&iterate(int index);
 };
 
 template <class E> int List<E>::getIndexInRange(int index) const {
@@ -182,6 +184,9 @@ template <class E> E List<E>::pop(int index) {
 }
 
 template <class E> List<E> &List<E>::clear() {
+    if (this->_length == 0) {
+        return *this;
+    }
     this->head->destruct();
     this->head = NULL;
     this->_length = 0;
@@ -266,12 +271,13 @@ template <class E> List<E> &List<E>::operator=(const List<E> &otherList) {
     if (otherList.length() > 0) {
         this->head = new Node<E>(otherList[0]);
         this->_length = 1;
-        Node<E> *nextPtr = otherList->head->getNextPtr();
+        Node<E> *nextPtr = otherList.head->getNextPtr();
         while (nextPtr != NULL) {
             this->append((*nextPtr).getContent());
             nextPtr = (*nextPtr).getNextPtr();
         }
     }
+    return *this;
 }
 
 template <class E> int List<E>::length() const {
@@ -342,7 +348,7 @@ List<E> &List<E>::filter(std::function<bool(const E &)> const &isTargetFunc) {
     }
 
     Node<E> *current = this->head;
-    while(current->getNextPtr() != NULL) {
+    while (current->getNextPtr() != NULL) {
         if (!isTargetFunc(current->getNextPtr()->getContent())) {
             Node<E> *newNext = current->getNextPtr()->getNextPtr();
             delete current->getNextPtr();
@@ -354,7 +360,8 @@ List<E> &List<E>::filter(std::function<bool(const E &)> const &isTargetFunc) {
     return *this;
 }
 
-template <class E> List<E> List<E>::filtered(std::function<bool(const E&)> const &isTargetFunc) {
+template <class E>
+List<E> List<E>::filtered(std::function<bool(const E &)> const &isTargetFunc) const {
     return List<E>(*this).filter(isTargetFunc);
 }
 
@@ -362,4 +369,18 @@ template <class E>
 const List<E> List<E>::sorted(
     std::function<bool(const E &, const E &)> const &isCorrectOrderFunc) const {
     return List<E>(*this).sort(isCorrectOrderFunc);
+}
+
+template <class E>
+Iterator<E> &&List<E>::iterate() {
+    return std::move(Iterator<E>(this->head));
+}
+
+template <class E>
+Iterator<E> &&List<E>::iterate(int index) {
+    index = this->getIndexInRange(index);
+    if (index == 0) {
+        return std::move(Iterator<E>(this->head));
+    }
+    return std::move(Iterator<E>(&this->head->getByIndex(index)));
 }
\ No newline at end of file
diff --git a/大作业/Makefile b/大作业/Makefile
index 8cc67f7..d994bdd 100644
--- a/大作业/Makefile
+++ b/大作业/Makefile
@@ -1,6 +1,6 @@
-generalArguments = -std=c++11
+generalArguments = -std=c++20
 
-main.out: main.o Tools.o Exceptions.o Record.o Date.o
+main.out: main.o Tools.o Exceptions.o Record.o Date.o Student.o ListDisplay.o
 	clang++ $(generalArguments) -g $^ -o main.out
 
 main.o: main.cpp
@@ -9,11 +9,17 @@ main.o: main.cpp
 Exceptions.o: Exceptions.cpp
 	clang++ $(generalArguments) -g -c Exceptions.cpp -o Exceptions.o
 
-Record.o: Record.cpp
+Record.o: Record.cpp 
 	clang++ $(generalArguments) -g -c Record.cpp -o Record.o
 
 Date.o: Date.cpp
 	clang++ $(generalArguments) -g -c Date.cpp -o Date.o
 
 Tools.o: Tools.cpp
-	clang++ $(generalArguments) -g -c Tools.cpp -o Tools.o
\ No newline at end of file
+	clang++ $(generalArguments) -g -c Tools.cpp -o Tools.o
+
+ListDisplay.o: ListDisplay.cpp
+	clang++ $(generalArguments) -g -c ListDisplay.cpp -o ListDisplay.o
+
+Student.o: Student.cpp
+	clang++ $(generalArguments) -g -c Student.cpp -o Student.o
\ No newline at end of file
diff --git a/大作业/Node.hpp b/大作业/Node.hpp
index 0262639..51d10dd 100755
--- a/大作业/Node.hpp
+++ b/大作业/Node.hpp
@@ -27,6 +27,18 @@ public:
     void destruct();
 };
 
+template <class E> class Iterator {
+private:
+    Node<E> *current;
+
+public:
+    Iterator(Node<E> *pos);
+    bool hasNext();
+    // Return the same as hasNext();
+    operator bool();
+    E &next();
+};
+
 template <class E> Node<E>::Node() : content(0), nextNode(NULL){};
 
 template <class E>
@@ -72,4 +84,23 @@ template <class E> void Node<E>::destruct() {
         this->nextNode->destruct();
     }
     delete this;
+}
+
+template <class E> Iterator<E>::Iterator(Node<E> *start) : current(start){};
+
+template <class E> bool Iterator<E>::hasNext() {
+    return this->current != NULL;
+}
+
+template <class E> Iterator<E>::operator bool() {
+    return this->hasNext();
+}
+
+template <class E> E &Iterator<E>::next() {
+    if (!this->hasNext()) {
+        throw(IndexError("Out of bound!"));
+    }
+    E &temp = this->current->getContent();
+    this->current = this->current->getNextPtr();
+    return temp;
 }
\ No newline at end of file
diff --git a/大作业/Record.cpp b/大作业/Record.cpp
index 289d6f6..63cdd48 100644
--- a/大作业/Record.cpp
+++ b/大作业/Record.cpp
@@ -5,25 +5,19 @@
 
 unsigned BaseRecord::nextRecordID = 1;
 
-std::string BaseRecord::cutToLength(std::string str, int length) const {
-    if (str.length() <= length) {
-        return str;
-    }
-    else {
-        return str.substr(0, length) + "+";
-    }
-}
-
 BaseRecord::BaseRecord(const time_t _date, const std::string _courseName,
                        const int _studentNumber, const std::string _studentName)
     : recordID(nextRecordID++), date(_date), courseName(_courseName),
-      studentNumber(_studentNumber), studentName(_studentName){};
+      student(_studentNumber, _studentName){};
 
 BaseRecord::BaseRecord(const unsigned _recordID, const time_t _date,
                        const std::string _courseName, const int _studentNumber,
                        const std::string _studentName)
     : recordID(_recordID), date(_date), courseName(_courseName),
-      studentNumber(_studentNumber), studentName(_studentName){};
+      student(_studentNumber, _studentName){};
+
+BaseRecord::~BaseRecord() {
+}
 
 const unsigned BaseRecord::getRecordID() const {
     return this->recordID;
@@ -38,11 +32,11 @@ const std::string BaseRecord::getCourseName() const {
 }
 
 const int BaseRecord::getStudentNumber() const {
-    return this->studentNumber;
+    return this->student.getNumber();
 }
 
 const std::string BaseRecord::getStudentName() const {
-    return this->studentName;
+    return this->student.getName();
 }
 
 void BaseRecord::promptForNewDate(bool showOriginal) {
@@ -52,34 +46,35 @@ void BaseRecord::promptForNewDate(bool showOriginal) {
     if (showOriginal) {
         char buffer[20];
         strftime(buffer, 20, "%F", curDate);
-        std::cout << setoutputcolor(green) << "Current date: " << buffer
+        std::cout << setoutputcolor(ConsoleColorTool::green)
+                  << "Current date: " << buffer
                   << ". Enter 0 to retain original value." << resetOutputColor
                   << std::endl;
-        std::cout << setoutputcolor(blue) << "Year: " << resetOutputColor
-                  << std::flush;
+        std::cout << setoutputcolor(ConsoleColorTool::blue)
+                  << "Year: " << resetOutputColor << std::flush;
         std::cin >> tempInput;
         curDate->tm_year =
             (tempInput == 0 ? curDate->tm_year : tempInput - 1900);
-        std::cout << setoutputcolor(blue) << "Month: " << resetOutputColor
-                  << std::flush;
+        std::cout << setoutputcolor(ConsoleColorTool::blue)
+                  << "Month: " << resetOutputColor << std::flush;
         std::cin >> tempInput;
         curDate->tm_mon = (tempInput == 0 ? curDate->tm_mon : tempInput - 1);
-        std::cout << setoutputcolor(blue) << "Day: " << resetOutputColor
-                  << std::flush;
+        std::cout << setoutputcolor(ConsoleColorTool::blue)
+                  << "Day: " << resetOutputColor << std::flush;
         std::cin >> tempInput;
         curDate->tm_mday = (tempInput == 0 ? curDate->tm_mday : tempInput);
     }
     else {
-        std::cout << setoutputcolor(blue) << "Year: " << resetOutputColor
-                  << std::flush;
+        std::cout << setoutputcolor(ConsoleColorTool::blue)
+                  << "Year: " << resetOutputColor << std::flush;
         std::cin >> tempInput;
         curDate->tm_year = tempInput - 1900;
-        std::cout << setoutputcolor(blue) << "Month: " << resetOutputColor
-                  << std::flush;
+        std::cout << setoutputcolor(ConsoleColorTool::blue)
+                  << "Month: " << resetOutputColor << std::flush;
         std::cin >> tempInput;
         curDate->tm_mon = tempInput - 1;
-        std::cout << setoutputcolor(blue) << "Day: " << resetOutputColor
-                  << std::flush;
+        std::cout << setoutputcolor(ConsoleColorTool::blue)
+                  << "Day: " << resetOutputColor << std::flush;
         std::cin >> tempInput;
         curDate->tm_mday = tempInput;
     }
@@ -88,10 +83,10 @@ void BaseRecord::promptForNewDate(bool showOriginal) {
 
 void BaseRecord::promptForNewCourseName(bool showOriginal) {
     if (showOriginal) {
-        std::cout << setoutputcolor(green)
+        std::cout << setoutputcolor(ConsoleColorTool::green)
                   << "Original course name: " << resetOutputColor
                   << this->courseName << "\n"
-                  << setoutputcolor(green)
+                  << setoutputcolor(ConsoleColorTool::green)
                   << "Enter 0 to retain original value." << std::endl;
     }
     std::cout << "Course name: " << std::flush;
@@ -99,56 +94,86 @@ void BaseRecord::promptForNewCourseName(bool showOriginal) {
 }
 
 void BaseRecord::promptForNewStudentInfo(bool showOriginal) {
+    int tempStuID;
+    std::string tempStuName;
     if (showOriginal) {
-        int tempStuID;
-        std::string tempStuName;
-        std::cout << setoutputcolor(green) << "Current student info: \n"
-                  << setoutputcolor(blue) << "Student ID: " << resetOutputColor
-                  << this->studentNumber << "\n"
-                  << setoutputcolor(blue)
-                  << "Student Name: " << resetOutputColor << this->studentName
-                  << "\n"
-                  << setoutputcolor(green)
+        std::cout << setoutputcolor(ConsoleColorTool::green)
+                  << "Current student info: \n"
+                  << setoutputcolor(ConsoleColorTool::blue)
+                  << "Student ID: " << resetOutputColor
+                  << this->student.getNumber() << "\n"
+                  << setoutputcolor(ConsoleColorTool::blue)
+                  << "Student Name: " << resetOutputColor
+                  << this->student.getName() << "\n"
+                  << setoutputcolor(ConsoleColorTool::green)
                   << "Enter 0 to retain original value." << std::endl;
-        std::cout << setoutputcolor(blue) << "Student ID: " << resetOutputColor
-                  << std::flush;
+        std::cout << setoutputcolor(ConsoleColorTool::blue)
+                  << "Student ID: " << resetOutputColor << std::flush;
         std::cin >> tempStuID;
-        this->studentNumber =
-            (tempStuID == 0 ? this->studentNumber : tempStuID);
-        std::cout << setoutputcolor(blue)
-                  << "Studnet Name: " << resetOutputColor << std::flush;
+        this->student.setNumber(tempStuID == 0 ? this->student.getNumber()
+                                               : tempStuID);
+        std::cout << setoutputcolor(ConsoleColorTool::blue)
+                  << "Student Name: " << resetOutputColor << std::flush;
         std::cin >> tempStuName;
-        this->studentName =
-            (tempStuName == "0" ? this->studentName : tempStuName);
+        this->student.setName(tempStuName == "0" ? this->student.getName()
+                                                 : tempStuName);
     }
     else {
-        std::cout << setoutputcolor(blue) << "Student ID: " << resetOutputColor
-                  << std::flush;
-        std::cin >> this->studentNumber;
-        std::cout << setoutputcolor(blue)
-                  << "Studnet Name: " << resetOutputColor << std::flush;
-        std::cin >> this->studentName;
+        std::cout << setoutputcolor(ConsoleColorTool::blue)
+                  << "Student ID: " << resetOutputColor << std::flush;
+        std::cin >> tempStuID;
+        this->student.setNumber(tempStuID);
+        std::cout << setoutputcolor(ConsoleColorTool::blue)
+                  << "Student Name: " << resetOutputColor << std::flush;
+        std::cin >> tempStuName;
+        this->student.setName(tempStuName);
     }
 }
 
 void BaseRecord::display() const {
-    std::cout << std::setfill('0') << std::setw(8) << this->recordID;
-    std::cout << " | ";
-    std::cout << std::setfill(' ') << std::setw(12)
-              << this->cutToLength(this->date.toString(), 12);
-    std::cout << " | ";
-    std::cout << std::setfill(' ') << std::setw(15)
-              << this->cutToLength(this->courseName, 15);
-    std::cout << " | ";
-    std::cout << std::setfill(' ') << std::setw(10) << this->studentNumber;
-    std::cout << " | ";
-    std::cout << std::setfill(' ') << std::setw(15)
-              << this->cutToLength(this->studentName, 15);
-    std::cout << " | ";
-    std::cout << std::setfill(' ') << std::setw(10) << this->getRecordType();
+    std::cout << "│   " << std::setfill('0')
+              << std::setw(recordDisplayRowSize.recordID - 2) << this->recordID;
+    std::cout << " │ ";
+    std::cout << std::setfill(' ') << std::setw(recordDisplayRowSize.date)
+              << cutToLength(this->date.toString(), recordDisplayRowSize.date);
+    std::cout << " │ ";
+    std::cout << std::setfill(' ') << std::setw(recordDisplayRowSize.courseName)
+              << cutToLength(this->courseName, recordDisplayRowSize.courseName);
+    std::cout << " │ ";
+    std::cout << std::setfill(' ') << std::setw(recordDisplayRowSize.studentID)
+              << this->student.getNumber();
+    std::cout << " │ ";
+    std::cout << std::setfill(' ')
+              << std::setw(recordDisplayRowSize.studentName)
+              << cutToLength(this->student.getName(),
+                             recordDisplayRowSize.studentName);
+    std::cout << " │ ";
+    std::cout << std::setfill(' ') << std::setw(recordDisplayRowSize.type)
+              << this->getRecordType() << " │";
     std::cout << std::endl;
 }
 
+void BaseRecord::displayComplete() const {
+    std::cout << setoutputcolor(true) << setbgcolor(ConsoleColorTool::cyan)
+              << "Record ID " << this->recordID << resetOutputColor << "\n";
+    std::cout << setoutputcolor(ConsoleColorTool::green)
+              << "Date: " << resetOutputColor << this->date.toString() << "\n";
+    std::cout << setoutputcolor(ConsoleColorTool::green)
+              << "Course name: " << resetOutputColor << this->courseName
+              << "\n";
+    std::cout << setoutputcolor(ConsoleColorTool::green)
+              << "Student: " << resetOutputColor << "\n";
+    std::cout << "├─" << setoutputcolor(ConsoleColorTool::blue)
+              << "ID: " << resetOutputColor << this->student.getNumber()
+              << "\n";
+    std::cout << "└─" << setoutputcolor(ConsoleColorTool::blue)
+              << "Name: " << resetOutputColor << this->student.getName()
+              << "\n";
+    std::cout << setoutputcolor(ConsoleColorTool::green)
+              << "Type: " << resetOutputColor << this->getRecordType()
+              << std::endl;
+}
+
 LateRecord::LateRecord(const time_t _date, const std::string _courseName,
                        const int _studentNumber, const std::string _studentName)
     : BaseRecord(_date, _courseName, _studentNumber, _studentName){};
@@ -162,6 +187,17 @@ std::string LateRecord::getRecordType() const {
     return "Late";
 }
 
+LateRecord::operator SaveRecord() const {
+    return SaveRecord{.recordID = this->recordID,
+                      .date = this->date.getTime(),
+                      .courseNameLength = this->courseName.length(),
+                      .studentNumber = this->student.getNumber(),
+                      .studentNameLength = this->student.getName().length(),
+                      .recordType = StuRecord::Late};
+}
+
+LateRecord::~LateRecord(){};
+
 AbsentRecord::AbsentRecord(const time_t _date, const std::string _courseName,
                            const int _studentNumber,
                            const std::string _studentName)
@@ -177,6 +213,17 @@ std::string AbsentRecord::getRecordType() const {
     return "Absent";
 }
 
+AbsentRecord::operator SaveRecord() const {
+    return SaveRecord{.recordID = this->recordID,
+                      .date = this->date.getTime(),
+                      .courseNameLength = this->courseName.length(),
+                      .studentNumber = this->student.getNumber(),
+                      .studentNameLength = this->student.getName().length(),
+                      .recordType = StuRecord::Absent};
+}
+
+AbsentRecord::~AbsentRecord(){};
+
 PersonalLeaveRecord::PersonalLeaveRecord(const time_t _date,
                                          const std::string _courseName,
                                          const int _studentNumber,
@@ -194,27 +241,13 @@ std::string PersonalLeaveRecord::getRecordType() const {
     return "Personal";
 }
 
-SaveRecord::SaveRecord(const unsigned _recordID, const time_t _date,
-                       const std::string &courseName, const int _studentNumber,
-                       const std::string &studentName, RecordType _recordType)
-    : recordID(_recordID), date(_date), courseNameLength(courseName.length()),
-      studentNumber(_studentNumber), studentNameLength(studentName.length()),
-      recordType(_recordType){};
+PersonalLeaveRecord::operator SaveRecord() const {
+    return SaveRecord{.recordID = this->recordID,
+                      .date = this->date.getTime(),
+                      .courseNameLength = this->courseName.length(),
+                      .studentNumber = this->student.getNumber(),
+                      .studentNameLength = this->student.getName().length(),
+                      .recordType = StuRecord::PersonalLeave};
+}
 
-BaseRecord *SaveRecord::convertToRecord(const char *_courseName,
-                                        const char *_name) const {
-    switch (this->recordType) {
-    case Late:
-        return new LateRecord(this->recordID, this->date,
-                              std::string(_courseName), this->studentNumber,
-                              std::string(_name));
-    case Absent:
-        return new AbsentRecord(this->recordID, this->date,
-                                std::string(_courseName), this->studentNumber,
-                                std::string(_name));
-    case PersonalLeave:
-        return new PersonalLeaveRecord(this->recordID, this->date,
-                                       std::string(_courseName),
-                                       this->studentNumber, std::string(_name));
-    }
-}
\ No newline at end of file
+PersonalLeaveRecord::~PersonalLeaveRecord(){};
\ No newline at end of file
diff --git a/大作业/Record.hpp b/大作业/Record.hpp
index 7702539..d984f82 100644
--- a/大作业/Record.hpp
+++ b/大作业/Record.hpp
@@ -1,5 +1,6 @@
 #pragma once
 #include "Date.hpp"
+#include "Student.hpp"
 #include <ctime>
 
 /*
@@ -14,19 +15,33 @@ stduentName char[]
 SaveRecord
 courseName char[]
 */
-
+const struct {
+    int recordID = 10;
+    int date = 10;
+    int courseName = 15;
+    int studentID = 10;
+    int studentName = 15;
+    int type = 10;
+} recordDisplayRowSize;
+namespace StuRecord {
 enum RecordType { Late, Absent, PersonalLeave };
+};
+
+struct SaveRecord {
+    unsigned recordID;
+    time_t date;
+    unsigned long courseNameLength;
+    int studentNumber;
+    unsigned long studentNameLength;
+    StuRecord::RecordType recordType;
+};
 
 class BaseRecord {
-private:
+protected:
     unsigned recordID;
     Date date;
     std::string courseName;
-    int studentNumber;
-    std::string studentName;
-    // If the string is shorter than length, returns the string; if the string
-    // is longer than length, takes the first lenght - 1 letters and add a "+".
-    std::string cutToLength(std::string str, int length) const;
+    Student student;
 
 public:
     static unsigned nextRecordID;
@@ -38,6 +53,7 @@ public:
     BaseRecord(const unsigned _recordID, const time_t _date,
                const std::string _courseName, const int _studentNumber,
                const std::string _studentName);
+    virtual ~BaseRecord();
     const unsigned getRecordID() const;
     const Date &getDate() const;
     const std::string getCourseName() const;
@@ -46,11 +62,12 @@ public:
     void promptForNewDate(bool showOriginal = true);
     void promptForNewCourseName(bool showOriginal = true);
     void promptForNewStudentInfo(bool showOriginal = true);
+    // Show the infomation in a line.
     void display() const;
+    // Show the infomation in multiple lines.
     void displayComplete() const;
-    const char *getCourseNameChar() const;
-    const char *getStudentNameChar() const;
     virtual std::string getRecordType() const = 0;
+    virtual operator SaveRecord() const = 0;
 };
 
 class LateRecord : public BaseRecord {
@@ -60,7 +77,9 @@ public:
     LateRecord(const unsigned _recordID, const time_t _date,
                const std::string _courseName, const int _studentNumber,
                const std::string _studentName);
+    virtual ~LateRecord();
     virtual std::string getRecordType() const;
+    virtual operator SaveRecord() const;
 };
 
 class AbsentRecord : public BaseRecord {
@@ -70,7 +89,9 @@ public:
     AbsentRecord(const unsigned _recordID, const time_t _date,
                  const std::string _courseName, const int _studentNumber,
                  const std::string _studentName);
+    virtual ~AbsentRecord();
     virtual std::string getRecordType() const;
+    virtual operator SaveRecord() const;
 };
 
 class PersonalLeaveRecord : public BaseRecord {
@@ -81,23 +102,7 @@ public:
     PersonalLeaveRecord(const unsigned _recordID, const time_t _date,
                         const std::string _courseName, const int _studentNumber,
                         const std::string _studentName);
+    virtual ~PersonalLeaveRecord();
     virtual std::string getRecordType() const;
-};
-
-class SaveRecord {
-private:
-    unsigned recordID;
-    time_t date;
-    int courseNameLength;
-    int studentNumber;
-    int studentNameLength;
-    RecordType recordType;
-
-public:
-    SaveRecord() = delete;
-    SaveRecord(const unsigned _recordID, const time_t _date,
-               const std::string &courseName, const int _studentNumber,
-               const std::string &studentName, RecordType _recordType);
-    BaseRecord *convertToRecord(const char *_courseName,
-                               const char *_name) const;
+    virtual operator SaveRecord() const;
 };
\ No newline at end of file
diff --git a/大作业/Student.cpp b/大作业/Student.cpp
new file mode 100644
index 0000000..68c74f8
--- /dev/null
+++ b/大作业/Student.cpp
@@ -0,0 +1,59 @@
+#include "Student.hpp"
+
+Student::Student() : number(0), name(""), isAnyName(true), isAnyNumber(true) {};
+
+Student::Student(const int _number, const std::string _name) : number(_number), name(_name), isAnyNumber(false), isAnyName(false) {};
+
+const int Student::getNumber() const {
+    return this->number;
+}
+
+const std::string Student::getNumberString() const {
+    if (this->isAnyNumber) {
+        return "[Any]";
+    }
+    return std::to_string(this->number);
+}
+
+const std::string Student::getName() const {
+    if (this->isAnyName) {
+        return "[Any]";
+    }
+    return this->name;
+}
+
+void Student::setNumber(const int newNumber) {
+    this->isAnyNumber = false;
+    this->number = newNumber;
+}
+
+void Student::setName(const std::string newName) {
+    this->isAnyName = false;
+    this->name = newName;
+}
+
+void Student::setAnyNumber() {
+    this->isAnyNumber = true;
+    this->number = 0;
+}
+
+void Student::setAnyName() {
+    this->isAnyName = true;
+    this->name = "";
+}
+
+bool Student::matchesNumber(const Student &otherStu) const {
+    return this->isAnyNumber || this->number == otherStu.number;
+}
+
+bool Student::matchesName(const Student &otherStu) const {
+    return this->isAnyName || this->name == otherStu.name;
+}
+
+bool Student::matches(const Student &otherStu) const {
+    return this->matchesNumber(otherStu) && this->matchesName(otherStu);
+}
+
+bool Student::operator==(const Student &otherStu) const {
+    return this->matches(otherStu);
+}
\ No newline at end of file
diff --git a/大作业/Student.hpp b/大作业/Student.hpp
index 9643777..bd8d561 100644
--- a/大作业/Student.hpp
+++ b/大作业/Student.hpp
@@ -4,19 +4,29 @@ class Student {
 private:
     int number;
     std::string name;
+    bool isAnyNumber;
+    bool isAnyName;
 
 public:
     Student();
     Student(const int _number, const std::string _name);
-    Student(const Student &otherStudent);
-    // Return the student in format 'number name'.
-    std::string toString();
     // Returns student number.
-    int getNumber();
+    const int getNumber() const;
+    // Returns the string from of the number, so as to display "any"
+    const std::string getNumberString() const;
     // Returns student name.
-    std::string getName();
-    // Set the new name (especially when reading from file)
+    const std::string getName() const;
+    // Set the new number
+    void setNumber(const int newNumber);
+    // Set the new name
     void setName(const std::string newName);
-    void setName(const char *newName);
+    // Set the number to "any"
+    void setAnyNumber();
+    // Set the name to "any"
+    void setAnyName();
+    bool matchesNumber(const Student &otherStu) const;
+    bool matchesName(const Student &otherStu) const;
+    bool matches(const Student &otherStu) const;
+    bool operator==(const Student &otherStu) const;
 };
 
diff --git a/大作业/Tools.cpp b/大作业/Tools.cpp
index cfca06b..3efc4b0 100644
--- a/大作业/Tools.cpp
+++ b/大作业/Tools.cpp
@@ -1,4 +1,5 @@
 #include "Tools.hpp"
+using namespace ConsoleColorTool;
 
 setoutputcolor::setoutputcolor(ConsoleColors _color)
     : color(_color), bold(false){};
@@ -30,6 +31,9 @@ std::ostream &operator<<(std::ostream &out, setoutputcolor setOutput) {
     case green:
         out << ";32m";
         break;
+    case brown:
+        out << ";33m";
+        break;
     case blue:
         out << ";34m";
         break;
@@ -59,6 +63,9 @@ std::ostream &operator<<(std::ostream &out, setbgcolor setbg) {
     case green:
         out << "\033[7;32m";
         break;
+    case brown:
+        out << "\033[7;33m";
+        break;
     case blue:
         out << "\033[7;34m";
         break;
@@ -84,4 +91,31 @@ setbgcolor::setbgcolor(ConsoleColors _color) : color(_color){};
 std::ostream &resetOutputColor(std::ostream &out) {
     out << setoutputcolor(clear);
     return out;
+}
+
+const std::string cutToLength(const std::string str, const int length) {
+    if (str.length() <= length) {
+        return str;
+    }
+    else {
+        return str.substr(0, length - 3) + "...";
+    }
+}
+
+const std::string setMiddle(const std::string str, const int targetLength, char fillChar) {
+    if (str.length() >= targetLength) {
+        return cutToLength(str, targetLength);
+    }
+    int left, right;
+    right = (targetLength - str.length()) / 2;
+    left = targetLength - str.length() - right;
+    std::string result;
+    for (int i = 0; i < left; i++) {
+        result += fillChar;
+    }
+    result += str;
+    for (int i = 0; i < right; i++) {
+        result += fillChar;
+    }
+    return result;
 }
\ No newline at end of file
diff --git a/大作业/Tools.hpp b/大作业/Tools.hpp
index 12ffadd..41efa15 100644
--- a/大作业/Tools.hpp
+++ b/大作业/Tools.hpp
@@ -3,28 +3,46 @@
 
 // Reference: https://cplusplus.com/forum/unices/36461/
 
-enum ConsoleColors { black, red, green, blue, magenta, cyan, lightGray, clear };
+namespace ConsoleColorTool {
+enum ConsoleColors {
+    black,
+    red,
+    green,
+    brown,
+    blue,
+    magenta,
+    cyan,
+    lightGray,
+    clear
+};
+};
 
 class setoutputcolor {
 private:
-    ConsoleColors color;
+    ConsoleColorTool::ConsoleColors color;
     bool bold;
     friend std::ostream &operator<<(std::ostream &out,
                                     setoutputcolor setOutput);
 
 public:
-    setoutputcolor(ConsoleColors _color);
+    setoutputcolor(ConsoleColorTool::ConsoleColors _color);
     setoutputcolor(bool bold);
-    setoutputcolor(ConsoleColors _color, bool bold);
+    setoutputcolor(ConsoleColorTool::ConsoleColors _color, bool bold);
 };
 
 class setbgcolor {
 private:
-    ConsoleColors color;
+    ConsoleColorTool::ConsoleColors color;
     friend std::ostream &operator<<(std::ostream &out, setbgcolor setbg);
 
 public:
-    setbgcolor(ConsoleColors _color);
+    setbgcolor(ConsoleColorTool::ConsoleColors _color);
 };
 
-std::ostream &resetOutputColor(std::ostream &out);
\ No newline at end of file
+std::ostream &resetOutputColor(std::ostream &out);
+
+// If the string is shorter than length, returns the string; if the string
+// is longer than length, takes the first lenght - 1 letters and add a "+".
+const std::string cutToLength(const std::string str, const int length);
+
+const std::string setMiddle(const std::string str, const int targetLength, char fillChar = ' ');
\ No newline at end of file
diff --git a/大作业/main.cpp b/大作业/main.cpp
index 82c644f..ff81fb3 100644
--- a/大作业/main.cpp
+++ b/大作业/main.cpp
@@ -1,8 +1,9 @@
+#include "ListDisplay.hpp"
 #include "ListE.hpp"
-#include "Tools.hpp"
 #include "Record.hpp"
-#include <iostream>
+#include "Tools.hpp"
 #include <iomanip>
+#include <iostream>
 
 template <class E> void display(List<E> list) {
     for (int i = 0; i < list.length(); i++) {
@@ -25,12 +26,12 @@ int main() {
     aList.swap(0, 3);
     display(aList);
 
-    // aList.sort([=](const int &a, const int &b) { return a > b; });
+    // aList.sort([](const int &a, const int &b) { return a > b; });
 
     // display(aList);
 
     List<int> bList =
-        aList.sorted([=](const int &a, const int &b) { return a > b; });
+        aList.sorted([](const int &a, const int &b) { return a > b; });
 
     display(bList);
 
@@ -38,17 +39,34 @@ int main() {
 
     display(bList);
 
-    bList.filter([=](const int &a) { return a > 6; });
+    bList.filter([](const int &a) { return a > 6; });
     display(bList);
-    std::cout << "hhh" << setoutputcolor(blue, true) << "aaa" << setoutputcolor(blue, false) << "bbb" << resetOutputColor << std::endl;
-    LateRecord la(125534456, "SomeCourse", 10821398, "SomeStu");
-    AbsentRecord lb(2874238743, "SomeotherCourse", 10239944, "SomeotherStu");
+    std::cout << "hhh" << setoutputcolor(ConsoleColorTool::blue, true) << "aaa"
+              << setoutputcolor(ConsoleColorTool::blue, false) << "bbb"
+              << resetOutputColor << std::endl;
+    LateRecord la(125534456, "SomeCourselonglonglonglonglong", 10821398, "SomeStu");
+    AbsentRecord lb(2874238743, "SomeOtherCourse", 10239944, "SomeotherStu");
     la.display();
-    std::cout << setbgcolor(lightGray);
+    std::cout << setbgcolor(ConsoleColorTool::lightGray);
     lb.display();
     std::cout << resetOutputColor;
 
-    la.promptForNewStudentInfo();
-    la.display();
+    // la.promptForNewStudentInfo();
+
+    // la.display();
+    la.displayComplete();
+
+    std::cout << "------------" << std::endl;
+    List<BaseRecord *> recordPtrList;
+
+    recordPtrList.append(new LateRecord(122333, "hhhh", 10394, "aneiei"));
+    recordPtrList.append(new AbsentRecord(123994994, "aadkfk", 129939948, "adiorrr"));
+    recordPtrList.append(new PersonalLeaveRecord(132934949, "mumu", 129293, "s999"));
+    ListDisplay displayer(recordPtrList);
+    displayer.display();
+    Iterator<BaseRecord *> it = recordPtrList.iterate();
+    while (it) {
+        delete it.next();
+    }
     return 0;
 }
\ No newline at end of file