这篇图书管理系统是对JavaSE知识总结复习的一个小作业，检测自己对知识的掌握程度。
public class Main {
public static User login(){
System.out.println("输入你的姓名：");
Scanner scanner = new Scanner(System.in);
String name = scanner.nextLine();
System.out.println("1.管理员 2.普通用户");
System.out.println("输入你的身份");
int choice = scanner.nextInt();
if (choice == 1){
return new Admin(name);
}else
{
return new NormalUser(name);
}
}
public static void main(String[] args) {
BookList bookList = new BookList();
User user = login();
while (true){
int choice = user.menu();
user.doOperation(choice,bookList);
}
}
}
public abstract class User {
private String name;
protected IOperation[] iOperations;
public User(String name){
this.name = name;
IOperation[] iOperations;
}
public abstract int menu();
public void doOperation(int choice,BookList bookList){
IOperation iOperation = iOperations[choice];
iOperation.work(bookList);
}
}
public class NormalUser extends User{
public NormalUser(String name) {
super(name);
this.iOperations =new IOperation[]{
new ExitOperation(),
new FindOperation(),
new BorrowOperation(),
new ReturnOperation()
};
}
@Override
public int menu() {
System.out.println("*******管理员菜单*********");
System.out.println("*******1.查找图书*********");
System.out.println("*******2.借阅图书*********");
System.out.println("*******3.归还图书*********");
System.out.println("***0.退出系统****");
System.out.println("请输入你的操作：");
Scanner scanner = new Scanner(System.in);
int choice = scanner.nextInt();
return choice;
}
}
public class Admin extends User{
public Admin(String name) {
super(name);
this.iOperations =new IOperation[] {
new ExitOperation(),
new FindOperation(),
new AddOperation(),
new DeleOperation(),
new ShouwOperation()
};
}
@Override
public int menu() {
System.out.println("*******管理员菜单*********");
System.out.println("*******1.查找图书*********");
System.out.println("*******2.增加图书*********");
System.out.println("*******3.删除图书*********");
System.out.println("*******4.显示图书*********");
System.out.println("***0.退出系统****");
System.out.println("请输入你的操作：");
Scanner scanner = new Scanner(System.in);
int choice = scanner.nextInt();
return choice;
}
}
public class Book{
//书名 作者 价格 类型 是否借出
private String name;
private String author;
private int price;
private String type;
private Boolean isBorrowed = false;
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 int getPrice() {
return price;
}
public void setPrice(int price) {
this.price = price;
}
public String getType() {
return type;
}
public void setType(String type) {
this.type = type;
}
public Boolean getBorrowed() {
return isBorrowed;
}
public void setBorrowed(Boolean borrowed) {
isBorrowed = borrowed;
}
public Book(String name, String author, int price, String type) {
this.name = name;
this.author = author;
this.price = price;
this.type = type;
}
@Override
public String toString() {
return "Book{" +
"name='" + name + '\'' +
", author='" + author + '\'' +
", price=" + price +
", type='" + type + '\'' +
", isBorrowed=" + isBorrowed +
'}';
}
}
public class BookList {
public Book[] books;
public int usedSize;
public BookList(){
this.books = new Book[10];
books[0] = new Book("三国演义","罗贯中",46,"小说");
books[1] = new Book("水浒传","施耐庵",37,"小说");
books[2] = new Book("红楼梦","曹雪芹",76,"小说");
books[3] = new Book("西游记","吴承恩",88,"小说");
usedSize = 4;
}
public Book getBook(int pos) {
return books[pos];
}
public void setBook(Book book,int pos) {
this.books[pos] = book;
}
public int getUsedSize() {
return usedSize;
}
public void setUsedSize(int usedSize) {
this.usedSize = usedSize;
}
}
public interface IOperation {
void work(BookList bookList);
Scanner scanner = new Scanner(System.in);
}
public class AddOperation implements IOperation{
@Override
public void work(BookList bookList) {
System.out.println("请输入你要增加图书的书名");
String name = scanner.nextLine();
System.out.println("请输入你要添加书的作者");
String author = scanner.nextLine();
System.out.println("请输入你要添加书的价格");
int price = scanner.nextInt();
System.out.println("请输入你要添加书的类型");
scanner.nextLine();
String type = scanner.nextLine();
int currentSize = bookList.getUsedSize();
for (int i = 0; i < currentSize; i++) {
if(bookList.getBook(i).getName().equals(name)){
System.out.println("该书已经存在，无法添加！");
return;
}
}
//书不存在 进行添加操作
Book book = new Book(name,author,price,type);
bookList.setBook(book,currentSize);
bookList.setUsedSize(currentSize+1);
}
}
public class DeleOperation implements IOperation{
@Override
public void work(BookList bookList) {
System.out.println("请输入你要删除书的书名：");
String name = scanner.nextLine();
int index = -1;
int i =0;
int currentSize = bookList.getUsedSize();
for ( i = 0; i < currentSize; i++) {
Book book = bookList.getBook(i);
if (book.getName().equals(name)){
index = i;
break;
}
}
if (i >= currentSize){
System.out.println("要删除的书不存在！");
return;
}
for (int j = index; j < currentSize-1; j++) {
Book book = bookList.getBook(j+1);
bookList.setBook(book,j);
}
bookList.setBook(null,currentSize);
bookList.setUsedSize(currentSize-1);
System.out.println("删除成功！！！");
}
}
public class FindOperation implements IOperation{
@Override
public void work(BookList bookList) {
System.out.println("请输入你要查找的书的书名：");
String name = scanner.nextLine();
int currentSize = bookList.getUsedSize();
for (int i = 0; i < currentSize; i++) {
Book book = bookList.getBook(i);
if (book.getName().equals(name)){
System.out.println(book);
return;
}
}
System.out.println("图书馆没有你要寻找的书！");
}
}
public class ShouwOperation implements IOperation{
@Override
public void work(BookList bookList) {
System.out.println("展示所有图书！");
int currentSize = bookList.getUsedSize();
for (int i = 0; i < currentSize; i++) {
Book book = bookList.getBook(i);
System.out.println(book);
}
}
}
public class BorrowOperation implements IOperation{
@Override
public void work(BookList bookList) {
System.out.println("图书馆的书如下：");
int currentSzie = bookList.getUsedSize();
for (int i = 0; i < currentSzie; i++) {
Book book = bookList.getBook(i);
System.out.println(book.getName());
}
System.out.println("请输入你要外借的图书的书名：");
String name = scanner.nextLine();
for (int i = 0; i < currentSzie; i++) {
Book book = bookList.getBook(i);
if(book.getName().equals(name)){
if (book.getBorrowed()){
System.out.println("该书已被借出，换本书吧！");
return;
}else {
book.setBorrowed(true);
System.out.println("借阅成功");
System.out.println("该书的信息如下");
System.out.println(book);
return;
}
}
}
System.out.println("你想借阅的图书不存在！");
}
}
public class ReturnOperation implements IOperation{
@Override
public void work(BookList bookList) {
System.out.println("归还图书");
System.out.println("请输入你要归还的图书的书名");
String name = scanner.nextLine();
int currentSize = bookList.getUsedSize();
for (int i = 0; i < currentSize; i++) {
Book book = bookList.getBook(i);
if (book.getName().equals(name)){
book.setBorrowed(false);
System.out.println("归还成功！");
return;
}
}
System.out.println("不存在你要归还的图书！");
}
}
public class ExitOperation implements IOperation{
@Override
public void work(BookList bookList) {
System.out.println("退出系统！");
System.exit(0);
}
}
以上就是图书管理系统的所有知识，有些地方还是需要思考去巧妙地设计使得文章更加简洁明了。冰冻三尺，非一日之寒。水滴石穿，非一日之功。坚持把每一个知识点搞清楚，并进行总结，形成属于自己的知识框架，会让你的学习更加轻松。