1. 图书管理系统菜单
如上图给用户选项
1. 管理员
2. 普通用户
2. 实现基本框架
右键点src，选择new，选择Package命名三个包 book operation user
1.先选择book包，new两个类 book bookList
在book类中定义书的基本属性，并重写toString方法，构造方法 ，以及实现成员变量的Getter and Setter方法
在bookList类中定义一个一个数组储存图书Book[]，以及一个usedSize记录图书的数量，重写构造方法，并实现成员变量的Getter and Setter方法
2. 选择operation包，创建一个接口并创建work方法（抽象方法），规范包中的类
package operation;
import book.BookList;
public interface IOperation {
void work();
}
命名以上的类，并重写work方法
3. 选择user包，创建User类，AdminUser类，NormalUser类，让前者作为父类
在User类中定义name接受用户名，并创建抽象方法menu模拟进入程序
public abstract class User {
protected String name;
public User(String name) {
this.name = name;
}
public abstract int menu();
}
程序的入口
package book;
import user.*;
import java.util.Scanner;
public class Main {
public static User login(){
Scanner scanner = new Scanner(System.in);
System.out.println("请输入你的名字: ");
String name = scanner.nextLine();
System.out.println("请输入你的身份: ");
System.out.println("1. 管理员 0. 普通用户");
int choice = scanner.nextInt();
if(choice == 1){
AdminUser adminUser = new AdminUser(name);
return adminUser;
}else{
NormalUser normalUser = new NormalUser(name);
return normalUser;
}
}
public static void main(String[] args) {
BookList bookList = new BookList();
User user = login();
while (true){
int choice = user.menu();
user.doOperation(choice,bookList);
}
}
}
3. 实现业务
3.1 借阅图书
package operation;
import book.*;
import java.util.Scanner;
public class BorrowedOperation implements IOperation{
public void work(BookList booklist) {
System.out.println("借阅图书");
Scanner scanner = new Scanner(System.in);
System.out.println("请输入书名；");
String name = scanner.nextLine();
int currentSize = booklist.getUsedSize();
for (int i = 0; i < currentSize; i++) {
Book book1 = booklist.getBook(i);
if(book1.getName().equals(name)) {
if(!book1.isBorrowed()){
book1.setBorrowed(true);
System.out.println("借阅成功");
}else{
System.out.println("这本图书已经被借走了：");
}
return;
}
}
System.out.println("书架上内有你要借阅的图书：");
}
}
3.2 查找图书
package operation;
import book.*;
import java.util.Scanner;
public class FindOperation implements IOperation{
public void work(BookList booklist) {
System.out.println("查找图书");
Scanner scanner = new Scanner(System.in);
System.out.println("请输入你要查找的图书: ");
String name = scanner.nextLine();
int currentSize = booklist.getUsedSize();
for (int i = 0; i < booklist.getUsedSize(); i++) {
Book book = booklist.getBook(i);
if(book.getName().equals(name)){
System.out.println("找到了你要找的书: ");
System.out.println(book);
return;
}
}
System.out.println("书架上没有这本书！");
}
}
3.3 归还图书
package operation;
import book.*;
import java.util.Scanner;
public class ReturnOperation implements IOperation{
public void work(BookList booklist) {
System.out.println("归还图书");
Scanner scanner = new Scanner(System.in);
System.out.println("请输入书名；");
String name = scanner.nextLine();
int currentSize = booklist.getUsedSize();
for (int i = 0; i < currentSize; i++) {
Book book1 = booklist.getBook(i);
if(book1.getName().equals(name)){
if(!book1.isBorrowed()){
System.out.println("这本图书没有被借走");
}else{
book1.setBorrowed(false);
System.out.println("归还成功");
}
return;
}
}
System.out.println("没有你要归还的图书");
}
}
3.4 新增图书
package operation;
import book.*;
import java.util.Scanner;
public class AddOperation implements IOperation{
@Override
public void work(BookList booklist) {
System.out.println("增加图书");
Scanner scanner = new Scanner(System.in);
System.out.println("请输入书名；");
String name = scanner.nextLine();
System.out.println("请输入作者名；");
String author = scanner.nextLine();
System.out.println("请输入价格；");
int price = scanner.nextInt();
scanner.nextLine();
System.out.println("请输入类型；");
String style = scanner.nextLine();
Book book = new Book(name,author,price,style);
int currentSize = booklist.getUsedSize();
for (int i = 0; i < currentSize; i++) {
Book book1 = booklist.getBook(i);
if(book1.getName().equals(name)){
System.out.println("书架上已经有这本书了");
return;
}
}
booklist.setBook(currentSize,book);
booklist.setUsedSize(currentSize+1);
}
}
3.5 删除图书
package operation;
import book.*;
import java.util.Scanner;
public class DelOperation implements IOperation{
public void work(BookList booklist) {
System.out.println("删除图书");
Scanner scanner = new Scanner(System.in);
System.out.println("请输入你要删除的图书；");
String name = scanner.nextLine();
int currentSize = booklist.getUsedSize();
if(currentSize == 0){
System.out.println("书架为空：");
return;
}
int index = -1;
for (int i = 0; i < currentSize; i++) {
Book book1 = booklist.getBook(i);
if(book1.getName().equals(name)) {
index = i;
break;
}
}
if(index == -1){
System.out.println("书架上没有这本书：");
return;
}
for (int i = index; i < currentSize; i++) {
Book book1 = booklist.getBook(i+1);
booklist.setBook(i,book1);
}
booklist.setUsedSize(currentSize-1);
}
}
3.6 显示图书
package operation;
import book.*;
public class ShowOperation implements IOperation{
public void work(BookList booklist) {
System.out.println("展示图书");
int currentSize = booklist.getUsedSize();
for (int i = 0; i < booklist.getUsedSize(); i++) {
Book book = booklist.getBook(i);
System.out.println(book);
}
}
}
3.7 退出系统
package operation;
import book.Book;
import book.BookList;
public class ExitOperation implements IOperation{
public void work(BookList booklist) {
System.out.println("退出系统");
for (int i = 0; i < booklist.getUsedSize(); i++) {
booklist.setBook(i,null);
}
booklist.setUsedSize(0);
System.exit(0);
}
}
