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java
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import java.util.ArrayList; import java.util.LinkedList; import java.util.Stack; import java.util.List; public class Student implements Borrower { private String UID; private String firstName; private String lastName; private MyDate joinDate; private String department; StudentSnapshot s; public static ArrayList<Borrower> students = new ArrayList<Borrower>(); public Student() { } public Borrower setUID(String UID) { this.UID = UID; s.snapshot(); return this; } public Borrower setFirstName(String firstName) { this.firstName = firstName; s.snapshot(); return this; } public Borrower setLastName(String lastName) { this.lastName = lastName; s.snapshot(); return this; } public Borrower setJoinDate(MyDate joinDate) { this.joinDate = joinDate; s.snapshot(); return this; } public Borrower setDepartment(String department) { this.department = department; s.snapshot(); return this; } public void add(Borrower s) { students.add(s); } public String getUID() { return this.UID; } public String getFirstName() { return this.firstName; } public String getLastName() { return this.lastName; } public MyDate getJoinDate() { return this.joinDate; } public String getDepartment() { return this.department; } public static void printArr() { for (Borrower student : students) { System.out.println(student); } } public static boolean checkRegistered(String UID) { for (Borrower student : students) { if (UID.equals(student.getUID())) { return true; } } return false; } @Override public String toString() { return "{" + " UID='" + getUID() + "'" + ", firstName='" + getFirstName() + "'" + ", lastName='" + getLastName() + "'" + ", joinDate='" + getJoinDate() + "'" + ", department='" + getDepartment() + "'" + "}"; } } class StudentSnapshot { private String UID; private String firstName; private String lastName; private MyDate joinDate; private String department; List <Object> dll = new LinkedList<Object> (); public void snapshot(){ Student s = new Student(); s.setUID(this.UID); s.setFirstName(this.firstName); s.setLastName(this.lastName); s.setJoinDate(this.joinDate); s.setDepartment(this.department); } public void undo(){ Student snap = dll.head; this.UID = snap.UID; } }
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