Java实验报告图书管理系统1. 管理员界面密码验证展示所有图书查找图书添加书籍删除书籍修改密码返回上一层结束2. 学生界面身份识别查找图书借阅图书归还书籍返回上一层结束3. 退出程序源代码：Main.javapackage com.company;import java.util.Date;import java.util.Scanner;public class Main public static void main(String args) / write your code here User U; Library L=new Library(东北大学图书馆); System.out.println(欢迎来到东北大学图书馆); Book b1=new Book(java编程思想,sdhf,554532,new Date(2016,12,13),15); Book b2=new Book(C+编程,nimei,15654,new Date(2017,5,13),5); Students s1=new Undergraduate(黎明,20175821); Students s2=new Master(狭隘,20164545); b1.BookUser.add(s2); b1.BookUser.add(s1); b2.BookUser.add(s2); b2.BookUser.add(s1); L.addBook(b1); L.addBook(b2); /在以上的代码中都是为了增加图书馆中的藏书 Scanner sc=new Scanner(System.in); String order; /命令操作板 while(true) System.out.println(命令操作符nAccessADInterfacenAccessSTInterfacenover); System.out.print(); order=sc.next(); if(order.equals(AccessADInterface) Administrators A=new Administrators(); if (A.getPassWord() = 1) while(true) System.out.println(命令操作符nShowAllBooknSearchBooknAddBooknDeleteBooknChangePassWordnGoBacknover); System.out.print(); order = sc.next(); if (order.equals(ShowAllBook) L.ShowBook(); else if (order .equals( SearchBook) L.ShowBook(L.SearchBook(); else if (order.equals( AddBook) ) L.addBook(); else if (order .equals( DeleteBook) L.DeleteBook(); else if(order.equals(ChangePassWord) A.changePassWord(); else if (order .equals( GoBack) break; else if (order .equals( over) System.out.println(已退出图书管理系统); System.exit(0); else System.exit(0); else if(order.equals(AccessSTInterface) U=L.UserComing(); while (true) System.out.println(SearchBooknBorrowBooknReturnBooknGoBacknover); System.out.print(); order=sc.next(); if(order.equals(SearchBook) L.ShowBook(L.SearchBook(); else if(order.equals(BorrowBook) L.SearchBook().BookBorrow(U); else if(order.equals(ReturnBook) L.ReturnBook(U); else if(order.equals(GoBack) break; else if(order.equals(over) System.out.println(已退出图书管理系统); System.exit(0); else System.out.println(输入了错误的指令); continue; Library.javapackage com.company;import java.util.Scanner;import java.util.Vector;public class Library public static final int OK=1; public static final int ERROR=1; Vector book= new Vector();/用来存储书类 丹书类中也存有用户类 private String Libraryname; Scanner sc=new Scanner(System.in); Library (String name) this.Libraryname=name; public User UserComing() int kind; User U; Scanner sc = new Scanner(System.in); System.out.println(如果你是老师请输入1，若是学生请输入2); while (true) while(true) kind = sc.nextInt(); if (kind = 1) U = new Teacher(); return U; else if (kind = 2) System.out.println(如果你是本科生请输入1，若是硕士研究生请输入2); while (true) kind=sc.nextInt(); if(kind=1) U = new Undergraduate(); return U; else if(kind=2) U=new Master(); return U; else System.out.