Java圖書管理系統(tǒng)需要哪些代碼？動力節(jié)點(diǎn)小編來告訴大家。

1.Book類

public class Book {
 private String name; //書名
 private String author; //作者
 public double price; //價(jià)格
 private String category; //分類
 private boolean state; //狀態(tài)  true-未借出  false-已借出
 //通過構(gòu)造函數(shù)給定書的屬性
 public Book(String name,String author,double price,String category,boolean state){
  this.author = author;
  this.name = name;
  this.price = price;
  this.category = category;
  this.state = state;
 }
 public Book() {  //默認(rèn)10本書
  this(10);
 }
 public Book(int i) {
  Person.books = new Book[i];
 }
 //屬性的獲取和設(shè)置
 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 getCategory() {
  return category;
 }
 public void setCategory(String category) {
  this.category = category;
 }
 public boolean getState() {
  return state;
 }
 public void setState(boolean state) {
  this.state = state;
 }
}

2.Library類

import java.util.Scanner;
public class Library {
 Scanner sc = new Scanner(System.in);
 //登錄函數(shù)：顯示登錄界面進(jìn)行選擇登錄
 public void login() {
  int count = 0;
  Person p = null;
  while (count < 2) {
   System.out.println("===============jewel圖書管理系統(tǒng)===============");
   System.out.println("歡迎討論指正！ qq505791225"+"\n");
   System.out.println("請登錄：1.普通用戶  2.管理員登錄  3.退出系統(tǒng)");
   int n = sc.nextInt();
   //通過輸入的值進(jìn)行登錄判斷
   if (n == 3) {
    return;
   }
   switch (n) {
    case 1:
     System.out.println("請輸入姓名：");
     String Uname = sc.next();
     System.out.println("請輸入性別：");
     String Usex = sc.next();
     System.out.println("請輸入年齡：");
     int Uage = sc.nextInt();
     p = new User(Uname,Usex,Uage); //構(gòu)造普通用戶對象
     System.out.println("登錄成功！");
     System.out.println("當(dāng)前普通用戶："+"姓名：" + p.getName() + " "+"性別：" + p.getSex() + " "+"年齡"+ p.getAge());
     //普通用戶循環(huán)操作
     while (true) {
      System.out.println("請輸入你的操作： 1.查詢書籍 2.借閱書籍 3.歸還書籍 4.顯示書籍列表 5.退出");
      int i = sc.nextInt();
      if (i == 5) {
       System.out.println("您已成功退出！");
       break;
      }else {
       p.operate();  //調(diào)用普通用戶的操作方法
      }
     }
     break;
    case 2:
     System.out.println("請輸入管理員姓名：");
     String Rname = sc.next();
     System.out.println("請輸入性別：");
     String Rsex = sc.next();
     System.out.println("請輸入年齡：");
     int Rage = sc.nextInt();
     p = new Root(Rname,Rsex,Rage);//構(gòu)造管理員對象
     System.out.println("登錄成功！");
     System.out.println("當(dāng)前管理員："+"姓名：" + p.getName() + " "+"性別：" + p.getSex() + " "+"年齡" + p.getAge());
     while (true) {
      System.out.println("請輸入你的操作： 1.整理書籍 2.查閱書籍 3.增加書籍 4.刪除書籍 5.顯示書籍列表 6.退出");
      int j = sc.nextInt();
      if (j == 6) {
       System.out.println("您已成功退出！");
       break;
      }else{
       p.operate();//調(diào)用管理員的操作方法
      }
     } break;
   }
  }
 }
}

3.Person類(抽象類)

abstract class Person {
 public String name;
 public String sex;
 public int age;
 /**
  *  默認(rèn)定義10本書籍。（預(yù)留3本新書的buffer,用來添加書籍）
  */
 public static Book[] books = new Book[]{
   new Book("西游記", "吳承恩", 10, "名著", true),
   new Book("紅樓夢", "曹雪芹", 20, "名著", true),
   new Book("三國演義", "羅貫中", 15, "名著", true),
   new Book("小茗同學(xué)", "小明", 5, "雜志", true),
   new Book("C與指針", "馬老師", 35, "計(jì)算機(jī)", true),
   new Book("Java編程思想", "王老師", 55, "計(jì)算機(jī)", true),
   new Book("新世界", "陳宇", 15, "雜志", true),
   new Book("阿衰與大頭妹", "阿衰", 5, "漫畫", true),
   new Book("一個(gè)人就一個(gè)人", "劉同", 35, "小說", true),
   new Book("活著", "陳彤", 36, "小說", true),
   new Book(),
   new Book(),
   new Book(),
 };
 public Person(String name, String sex, int age) {
  this.age = age;
  this.name = name;
  this.sex = sex;
 }
 public String getName() {
  return name;
 }
 public void setName(String name) {
  this.name = name;
 }
 public String getSex() {
  return sex;
 }
 public void setSex(String sex) {
  this.sex = sex;
 }
 public int getAge() {
  return age;
 }
 public void setAge(int age) {
  this.age = age;
 }
 /**
  *  抽象類中的抽象方法
  */
 public abstract void operate();
}

4.operate接口

public interface operate{  //操作的接口
    void select(Book[] books); //查詢，查閱
    void delete(Book[] books);//刪除,借閱
    void add(Book[] books); //增加，還書
    void list(Book[] books); //顯示書列表
}

5.Root類

import java.util.Arrays;
import java.util.Comparator;
import java.util.Scanner;
public class Root extends Person implements Operate {
 //繼承了人的類，需要重寫它的抽象方法operate，實(shí)現(xiàn)了operate接口，需要重寫接口內(nèi)的方法
 public Root(String name, String sex, int age) {
  //調(diào)用人基類的構(gòu)造函數(shù)
  super(name, sex, age);
 }
 Scanner sc = new Scanner(System.in);
 /**
  * 管理員的操作
  */
 @Override
 public void operate() {
  System.out.print("請輸入確認(rèn)操作:");
  int i = sc.nextInt();
  switch (i) {
   case 1:
    //整理
    sort(books);
    break;
   case 2:
    //查
    select(books);
    break;
   case 3:
    //加
    add(books);
    break;
   case 4:
    //刪
    delete(books);
    break;
   case 5:
    //列表
    list(books);
    break;
   default:
    System.out.println("輸入有誤！");
    break;
  }
 }
 /**
  *  compareable整理，重寫compare to，如果數(shù)組中有空的，則會出現(xiàn)空指針異常，把不空的拷到另一個(gè)新的數(shù)組，然后實(shí)現(xiàn)
  * @param books
  */
 public void sort(Book[] books) {
  System.out.println("圖書館中的書按價(jià)格整理如下:" + "\n" + "【書名】—— 【作者】——【價(jià)格】——【分類】——狀態(tài)");
  Arrays.sort(books, new Comparator<Book>() {
   @Override
   public int compare(Book o1, Book o2) {
    return (int) (o1.getPrice() - o2.getPrice());
   }
  });
  //遍歷數(shù)組打印書的列表
  for (int i = 0; i < books.length; i++) {
   if (books[i].price != 0) {
    System.out.println(
      "【" + books[i].getName() + "】—— 【" + books[i].getAuthor() + "】——【" + books[i].getPrice()
        + "】——【" + books[i].getCategory() + "】——" + books[i].getState());
   }
  }
 }
 @Override
 public void select(Book[] books) {
  System.out.println("請輸入書名進(jìn)行查詢：");
  String name = sc.next();
  if (name != null) {
   boolean flag = false;
   int bookNum = 0;
   for (int i = 0; i < books.length; i++) {
    if (books[i].getName() != null && name.equals(books[i].getName())) {
     flag = true;
     bookNum = i;
     break;
    }
   }
   if (!flag) {
    System.out.println("未查詢到此書籍！");
   } else {
    System.out.println("書籍信息為：" + "\n" + "【書名】—— 【作者】——【價(jià)格】——【分類】——狀態(tài)");
    System.out.println(
      "【" + books[bookNum].getName() + "】—— 【" + books[bookNum].getAuthor() + "】——【" + books[bookNum]
        .getPrice() + "】——【" + books[bookNum].getCategory() + "】——" + books[bookNum]
        .getState());
   }
  }
 }
 @Override
 public void delete(Book[] books) {
  System.out.println("請輸入要?jiǎng)h除的書名:");
  String str = sc.next();
  if (str != null) {
   for (int i = 0; i < books.length; i++) {
    if (books[i].getName().equals(str)) {
     books[i] = null;
     System.out.println("刪除成功！");
     break;
    }
   }
  }
 }
 @Override
 public void add(Book[] books) {
  System.out.println("請輸入書名：");
  String name = sc.next();
  System.out.println("請輸入作者：");
  String author = sc.next();
  System.out.println("請輸入價(jià)格：");
  double price = sc.nextDouble();
  System.out.println("請輸入分類：");
  String category = sc.next();
  boolean flag = false;
  for (int i = 0; i < books.length; i++) {
   if (books[i].getName() == null) {
    flag = true;
    books[i].setName(name);
    books[i].setAuthor(author);
    books[i].setPrice(price);
    books[i].setCategory(category);
    books[i].setState(true);
    System.out.println("添加成功");
    break;
   }
  }
  if (!flag) {
   System.out.println("【警告】數(shù)組預(yù)留buffer最多只能添加3本新書,沒有位置放置新書了，如需添加多余3本，需要在‘Person'類中添加buffer！" + "\n");
  }
 }
 @Override
 public void list(Book[] books) {
  System.out.println("圖書列表如下:" + "\n" + "【書名】—— 【作者】——【價(jià)格】——【分類】——狀態(tài)");  //打印Book數(shù)組
  for (int i = 0; i < books.length; i++) {
   if (books[i] != null) {
    if (books[i].price != 0) {
     System.out.println(
       "【" + books[i].getName() + "】—— 【" + books[i].getAuthor() + "】——【" + books[i].getPrice()
         + "】——【" + books[i].getCategory() + "】——" + books[i].getState());
    }
   }
  }
 }
}

6.User類

import java.util.Scanner;
public class User extends Person implements Operate {   //user類繼承了人的類，  實(shí)現(xiàn)operate接口
 public User(String name, String sex, int age) {
  //調(diào)用人基類的構(gòu)造函數(shù)（派生類不繼承基類的構(gòu)造函數(shù)）
  super(name, sex, age);
 }
 Scanner sc = new Scanner(System.in);
 @Override
 public void operate() {  //普通用戶的操作
  System.out.print("請輸入確認(rèn)操作:");
  int i = sc.nextInt();
  switch (i) {
   case 1:
    //查
    select(books);
    break;
   case 2:
    //借
    delete(books);
    break;
   case 3:
    //還
    add(books);
    break;
   case 4:
    //書列表
    list(books);
    break;
   default:
    System.out.println("輸入有誤！");
    break;
  }
 }
 @Override
 public void select(Book[] books) {
  System.out.println("請輸入書名進(jìn)行查詢：");
  String name = sc.next();
  if (name != null) {
   boolean flag = false;
   int bookNum = 0;
   for (int i = 0; i < books.length; i++) {
    if (books[i].getName() != null && name.equals(books[i].getName())) {
     flag = true;
     bookNum = i;
     break;
    }
   }
   if (!flag) {
    System.out.println("未查詢到此書籍！");
   } else {
    System.out.println("書籍信息為：" + "\n" + "【書名】—— 【作者】——【價(jià)格】——【分類】——狀態(tài)");
    System.out.println(
      "【" + books[bookNum].getName() + "】—— 【" + books[bookNum].getAuthor() + "】——【" + books[bookNum]
        .getPrice() + "】——【" + books[bookNum].getCategory() + "】——" + books[bookNum]
        .getState());
   }
  }
 }
 @Override
 public void delete(Book[] books) {
  System.out.println("請輸入要借閱的書名:");
  String name = sc.next();
  if (name != null) {
   for (int i = 0; i < books.length - 1; i++) {
    if (books[i].getName().equals(name)) {
     //借走書時(shí)設(shè)置狀態(tài)為false
     if (!books[i].getState()) {
      System.out.println("【" + name + "】" + "已經(jīng)被借出！");
     } else {
      books[i].setState(false);
      System.out.println("借閱成功！");
     }
     break;
    }
   }
  }
 }
 @Override
 public void add(Book[] books) {
  System.out.println("請輸入要還的書名：");
  String name = sc.next();
  if (name != null) {
   boolean flag = true;
   int i = 0;
   while (flag) {
    if (books[i].getName().equals(name)) {
     if (!books[i].getState()) {
      books[i].setState(true);
      System.out.println("還書成功！");
      flag = false;
     } else {
      System.out.println("該書籍已經(jīng)被還回！");
      break;
     }
    }
    i++;
   }
  }
 }
 @Override
 public void list(Book[] books) {
  System.out.println("圖書列表如下:" + "\n" + "【書名】—— 【作者】——【價(jià)格】——【分類】——狀態(tài)");  //打印Book數(shù)組
  for (int i = 0; i < books.length; i++) {
   if (books[i] != null) {
    if (books[i].price != 0) {
     System.out.println(
       "【" + books[i].getName() + "】—— 【" + books[i].getAuthor() + "】——【" + books[i].getPrice()
         + "】——【" + books[i].getCategory() + "】——" + books[i].getState());
    }
   }
  }
 }
}

7.Main類

public class Main {
    public static void main(String[] args) {
        Library library = new Library(); //構(gòu)造Library對象
        library.login(); //調(diào)用對象的登錄方法。
    }
}