java實現圖書館管理系統
阿新 • • 發佈：2020-01-07
本文例項為大家分享了java實現圖書館管理系統的具體程式碼，供大家參考，具體內容如下
思路：所有包都在book_manage包裡
利用面向物件的多型特性去除了很多if-else的判斷，不同的子類在父類所對應的方法不同。
1.首先建立一個book包
包裡面有2個類，一個是Book,這個類裡面包含一本書的全部資訊
另外一個類是BookList，這個類是用來管理每一個書，通過這個類來尋找每一本書。
private Book[] books = new Book[100];
Book數組裡面存放所有的書。
2.再建立一個包Operation 這個類裡面有一個OI介面，通過對接口裡面的Work方法重寫，來實現管理員身份和普通使用者身份的不同操作。
3.最後建立一個User包，裡面有三個類，User，Admin,NormalUser
Admin和NormalUser都繼承自User.
User裡秒你有一個數組
protected IO[] operation;
這個數組裡麵包含了使用者或者管理員所具備的操作。
通過對陣列的索引來確定具體需要呼叫的操作方法。
下面來看看程式碼吧：
book包
Book類
package book_manager.book;
public class Book {
private String name;
private String id;
private String author;
private int price;
private String type;
private boolean isBorrow;
public Book(String name,String id,String author,int price,String type,boolean isBorrow) {
this.name = name;
this.id = id;
this.author = author;
this.price = price;
this.type = type;
this.isBorrow = isBorrow;
}
@Override //Object中內建的類，用來格式化列印book的資訊
public String toString() {
return "Book{" +
"name='" + name + '\'' +
",id='" + id + '\'' +
",author='" + author + '\'' +
",price=" + price +
",type='" + type + '\'' +
",isBorrow=" + isBorrow +
'}';
}
public String getName(){
return name;
}
public boolean isBorrow(){
return isBorrow;
}
public void setBorrow(boolean bool){
this.isBorrow=bool;
}
public String getId(){
return id;
}
}BookList類
package book_manager.book;
import java.util.Arrays;
public class BookList {
private Book[] books = new Book[100];
private int size;
public BookList(){
books[0] = new Book("金瓶梅","001","蘭陵笑笑生",100,"古典名著",false);
books[1] = new Book("水滸傳","002","施耐庵",false);
books[2] = new Book("西遊記","003","吳承恩",false);
size = 3;
}
public int getSize(){
return size;
}
public void setBooks(int index,Book book){
books[index]=book;
}
public void setSize(int size){
this.size=size;
}
public Book getBook(int index){
return books[index];
}
}Operation包：
ADD類
package book_manager.Operation;
import book_manager.book.*;
import java.util.Scanner;
public class ADD implements IO{
@Override
public void work(BookList bookList) {
Scanner scanner = new Scanner(System.in);
System.out.println("請輸入書名");
String name =scanner.next();
System.out.println("請輸入序號");
String id = scanner.next();
System.out.println("請輸入作者");
String author =scanner.next();
System.out.println("請輸入價格");
int price = scanner.nextInt();
System.out.println("請輸入型別");
String type = scanner.next();
Book book = new Book(name,id,author,price,type,false);
bookList.setBooks(bookList.getSize(),book);
bookList.setSize(bookList.getSize()+1);
System.out.println("新增成功");
}
}
Borrow類
package book_manager.Operation;
import book_manager.book.Book;
import book_manager.book.BookList;
import java.util.Scanner;
public class Borrow implements IO{
@Override
public void work(BookList bookList) {
int i=0;
int flag=0;
Scanner scan = new Scanner(System.in);
System.out.println("請輸入需要借閱的書名");
String name = scan.next();
for(;i<bookList.getSize();i++){
if(name.equals(bookList.getBook(i).getName())){
if(bookList.getBook(i).isBorrow()==false){
System.out.println("借閱成功");
flag=1;
bookList.getBook(i).setBorrow(true);
}
}
}
if(flag==0){
System.out.println("不好意思，借閱失敗");
}
}
}
Delete類
package book_manager.Operation;
import book_manager.book.BookList;
import java.util.Scanner;
public class Delete implements IO{
public void work(BookList bookList){
Scanner scanner = new Scanner(System.in);
System.out.println("請輸入想要刪除的編號");
String id = scanner.next();
for(int i=0;i<bookList.getSize();i++){
if(bookList.getBook(i).getId().equals(id)){
bookList.setBooks(i,bookList.getBook(bookList.getSize()));
bookList.setSize(bookList.getSize()-1);
System.out.println("刪除成功");
}
else{
System.out.println("刪除失敗");
}
}
}
}
Exit類
package book_manager.Operation;
import book_manager.book.BookList;
public class Exit implements IO{
@Override
public void work(BookList bookList) {
System.out.println("退出成功");
System.exit(0);
}
}
Find類
package book_manager.Operation;
import book_manager.book.BookList;
import java.util.Scanner;
public class Find implements IO{
@Override
public void work(BookList bookList) {
int i=0;
int count=0;
Scanner scan = new Scanner(System.in);
System.out.println("請輸入需要查詢的書名");
String name = scan.next();
for(;i<bookList.getSize();i++){
if(name.equals(bookList.getBook(i).getName())){
count++;
}
}
if(count==0){
System.out.println("不好意思，沒有找到");
}
else{
System.out.println("找到了，共計"+count+"本");
}
}
}
IO介面
package book_manager.Operation;
import book_manager.book.BookList;
public interface IO {
abstract public void work(BookList bookList);
}
PrintAll類
package book_manager.Operation;
import book_manager.book.BookList;
public class PrintAll implements IO{
@Override
public void work(BookList bookList) {
for(int i=0;i<bookList.getSize();i++){
System.out.println(bookList.getBook(i));
}
}
}
Return類
package book_manager.Operation;
import book_manager.book.BookList;
import java.util.Scanner;
public class Return implements IO{
@Override
public void work(BookList bookList) {
int i=0;
int flag=0;
Scanner scan = new Scanner(System.in);
System.out.println("請輸入需要歸還的ID");
String id = scan.next();
for(;i<bookList.getSize();i++){
if(id.equals(bookList.getBook(i).getId())){
if(bookList.getBook(i).isBorrow()==true){
System.out.println("歸還成功");
bookList.getBook(i).setBorrow(false);
flag=1;
}
else{
System.out.println("歸還失敗");
}
}
}
if(flag==0){
System.out.println("不好意思，沒有此書");
}
}
}
user包:
User類
package book_manager.user;
import book_manager.Operation.*;
import book_manager.Operation.IO;
import book_manager.book.BookList;
abstract public class User {
String name;
protected IO[] operation;
public User(String name){
this.name=name;
}
abstract public int menu();//該方法被重寫
public void doOperation(int choice,BookList bookList) {
operation[choice].work(bookList);
}
}
Admin類
package book_manager.user;
import book_manager.Operation.*;
import java.util.Scanner;
public class Admin extends User{
public Admin(String name){
super(name);
operation=new IO[]{
new Exit(),new Find(),new ADD(),new Delete(),new PrintAll(),};
}
public int menu() {
System.out.println("============");
System.out.println("hello " + name);
System.out.println("1. 查詢書籍");
System.out.println("2. 增加書籍");
System.out.println("3. 刪除書籍");
System.out.println("4. 列印所有資訊");
System.out.println("0. 退出");
System.out.println("============");
System.out.println("請輸入您的選擇: ");
Scanner scanner = new Scanner(System.in);
int choice = scanner.nextInt();
return choice;
}
}
NormalUser
package book_manager.user;
import book_manager.Operation.*;
import java.util.Scanner;
public class NormalUser extends User{
public NormalUser(String name){
super(name);
operation=new IO[]{
new Exit(),new Borrow(),new Return(),new PrintAll()
};
}
public int menu() {
System.out.println("============");
System.out.println("hello " + name);
System.out.println("1. 查詢圖書");
System.out.println("2. 借閱圖書");
System.out.println("3. 歸還圖書");
System.out.println("4. 檢視全部書籍");
System.out.println("0. 退出");
System.out.println("============");
System.out.println("請輸入您的選擇: ");
Scanner scanner = new Scanner(System.in);
int choice = scanner.nextInt();
// close 本質上是在關閉 System.in
// 由於後面還需要用到 System.in,此處不能盲目關閉.
// scanner.close();
return choice;
}
}
最後還有一個Test類，裡面放了main函式
package book_manager;
import book_manager.book.BookList;
import book_manager.user.Admin;
import book_manager.user.NormalUser;
import book_manager.user.User;
import java.util.Scanner;
public class Test {
public static void main(String[] args) {
BookList list = new BookList();
User user = login();
//通過不同的choice和身份呼叫不同的Operation方法
while(true){
int choice = user.menu();
user.doOperation(choice,list);
}
}
public static User login(){
Scanner scanner = new Scanner(System.in);
System.out.println("請輸入你的姓名");
String name = scanner.next();
System.out.println("請輸入你的身份");
System.out.println("1.普通使用者 2.管理員");
int role= scanner.nextInt();
if(role==1){
return new NormalUser(name);
}
else{
return new Admin(name);
}
}
}
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以上就是本文的全部內容，希望對大家的學習有所幫助，也希望大家多多支援我們。