书类实现：

public class Book { private String name; private String author; private double price; private String tpey; private boolean isBrrow; public Book(String name, String author, double price, String tpey) { this.name = name; this.author = author; this.price = price; this.tpey = tpey; } public String getName() { return name; } public void setName(String name) { this.name = name; } public String getAuthor() { return author; } public void setAuthor(String author) { this.author = author; } public double getPrice() { return price; } public void setPrice(double price) { this.price = price; } public String getTpey() { return tpey; } public void setTpey(String tpey) { this.tpey = tpey; } public boolean isBrrow() { return isBrrow; } public void setBrrow(boolean brrow) { isBrrow = brrow; } @Override public String toString() { return "book{" + "name='" + name + '\'' + ", author='" + author + '\'' + ", price=" + price + ", tpey='" + tpey + '\'' + "," + (isBrrow ? "已被借出":"未被借出")+ '}'; } }

图书列表：

public class BookList { private Book[] books = new Book[100]; private int Usesize = 0; public BookList() { books[0] = new Book("java编程思想","程筱栋",12.5,"学习"); books[1] = new Book("剑指offer","高琼",13.5,"练习"); Usesize = 2; } public Book getBooks(int pos) { return books[pos]; } public void setBooks(int pos,Book books) { this.books[pos] = books; } public int getUsesize() { return Usesize; } public void setUsesize(int count) { this.Usesize = this.Usesize+count; } }

接口实现

public interface Iopeartion { Scanner sc = new Scanner(System.in); void work(BookList bookList); }

添加书籍类

public class AddOpeartion implements Iopeartion{ @Override public void work(BookList bookList) { System.out.println("请输入书名"); String name = sc.next(); System.out.println("请输入作者"); String anthor = sc.next(); System.out.println("请输入价格"); double price = sc.nextDouble(); System.out.println("请输入类型"); String tpey = sc.next(); int size = bookList.getUsesize(); Book book = new Book(name,anthor,price,tpey); bookList.setBooks(size,book); bookList.setUsesize(1); System.out.println("添加成功"); } }

删除书籍

public class DleOpeartion implements Iopeartion{ @Override public void work(BookList bookList) { System.out.println("请输入要删除的书名"); String name = sc.next(); int i = 0; for (; i < bookList.getUsesize(); i++) { if(bookList.getBooks(i).getName().equals(name)){ break; } } if(i >= bookList.getUsesize()){ System.out.println("此书不存在"); return; }else{ for (int j = i; j < bookList.getUsesize()-1; j++) { bookList.setBooks(j,bookList.getBooks(j+1)); } } bookList.setUsesize(-1); System.out.println("删除成功!"); } }

展示所有书籍

public class Displayopeartion implements Iopeartion { @Override public void work(BookList bookList) { for (int i = 0; i < bookList.getUsesize(); i++) { System.out.println(bookList.getBooks(i)); } } }

查看书籍

public class FindOpeartion implements Iopeartion { @Override public void work(BookList bookList) { System.out.println("请输入你要查阅的书籍"); String name = sc.next(); int i = 0; for (; i < bookList.getUsesize(); i++) { if(bookList.getBooks(i).getName().equals(name)){ break; } } if(i >= bookList.getUsesize()){ System.out.println("此书不存在"); return; }else{ System.out.println(bookList.getBooks(i)); } } }

借阅书籍

public class BrrrowOpeartion implements Iopeartion{ @Override public void work(BookList bookList) { System.out.println("请输入要借阅的书"); String name = sc.next(); int i =0; for (; i < bookList.getUsesize(); i++) { if(bookList.getBooks(i).getName().equals(name)){ break; } } if(i >= bookList.getUsesize()){ System.out.println("此书不存在"); return; } else if(bookList.getBooks(i).isBrrow()){ System.out.println("此书已被借阅"); return; }else { bookList.getBooks(i).setBrrow(true); System.out.println("借阅成功"); } } }

归还书籍

public class ReturnOpeation implements Iopeartion{ @Override public void work(BookList bookList) { System.out.println("请输入你要归还的书籍名： "); String name = sc.next(); int i = 0; for (; i < bookList.getUsesize(); i++) { if(bookList.getBooks(i).getName().equals(name)) { break; } } if (i >= bookList.getUsesize()) { System.out.println("此书不存在！"); return; } else if (bookList.getBooks(i).isBrrow() == false) { System.out.println("此书未被借阅！"); return; } else { bookList.getBooks(i).setBrrow(false); System.out.println("归还成功！"); } } }

退出系统

public class ExitOpeartion implements Iopeartion{ @Override public void work(BookList bookList) { System.out.println("已退出系统！"); System.exit(0); } }

定义User抽象类

public abstract class User { private String name; Scanner sc = new Scanner(System.in); protected Iopeartion[] iopeartions; public abstract int mean(); public void doIopartion(int choic, BookList bookList){ iopeartions[choic].work(bookList); } }

管理员类

public class Boss extends User{ public Boss(){ this.iopeartions = new Iopeartion[]{ new ExitOpeartion(), new AddOpeartion(), new DleOpeartion(), new Displayopeartion() }; } @Override public int mean() { System.out.println("===管理员界面==="); System.out.println("1.添加书籍"); System.out.println("2.删除书籍"); System.out.println("3.查看所有书籍"); System.out.println("0.退出系统"); int choic = sc.nextInt(); return choic; } }

普通用户

public class Nmirluser extends User{ public Nmirluser(){ this.iopeartions = new Iopeartion[]{ new ExitOpeartion(), new FindOpeartion(), new BrrrowOpeartion(), new ReturnOpeation() }; } @Override public int mean() { System.out.println("===用户界面==="); System.out.println("1.查阅书籍"); System.out.println("2.借阅书籍"); System.out.println("3.归还书籍"); System.out.println("0.退出系统"); int choic = sc.nextInt(); return choic; } }

mai函数设计

public class Maingoto { public static void main(String[] args) { User user = login(); BookList bookList = new BookList(); while(true){ int choic = user.mean(); user.doIopartion(choic,bookList); } } public static User login(){ Scanner sc = new Scanner(System.in); System.out.println("请输入姓名： "); String name = sc.next(); System.out.println("请选择身份"); int choic = sc.nextByte(); if (choic == 0){ return new Nmirluser(); }else { return new Boss(); } } }