JAVA程序设计(14.1)----- 图书馆管理系统 初步设计 内部功能篇

首先绘制思维导图，右下的user暂时不管先……

先做Book，抽象化属性，核心功能。然后是绘制BookManager的主要功能

然后直接导出到Eclipse进行修改调整，完成功能的内部结构如下：

package com.lovo.BookManager;import java.sql.Date;import java.text.SimpleDateFormat;/** * @author Abe * @version 1.0 * @created 05-十一月-2011 15:58:35 */public class Book implements Comparable<Book>{final long THE_DAY = 1000 * 60 * 60 * 24;private String name;private String isbn;private double price;private boolean lended;private int counter;private long lendDate;/** * 构造器 */public Book(String isbn, String name , double price){this.isbn = isbn ;this.name = name ;this.price = price;this.counter = (int)(Math.random()* 50);}/** * 借出 * @return */public boolean lendOut() {if (!lended) {lended = true;counter++;lendDate = System.currentTimeMillis();return true;}return false;}/** * 归还 * @return */public double returnBack() {if (lended) {lended = false;long currentTime = System.currentTimeMillis();int days = (int) Math.ceil((currentTime - lendDate) / THE_DAY);lendDate = 0;return days * price;}return 0;}public String getName() {return name;}public String getIsbn() {return isbn;}public double getPrice() {return price;}public boolean isLended() {return lended;}public int getCounter() {return counter;}/** * 出借日期 * @return */public String getLendDate() {if (lended) {Date date = new Date(lendDate);SimpleDateFormat sdf = new SimpleDateFormat("yyyy年MM月dd日");return sdf.format(date);} else {return "---";}}public void setName(String name) {this.name = name;}public void setPrice(double price) {this.price = price;}public void setCounter(int counter) {this.counter = counter;}/** * 重写比较的方法 */@Overridepublic int compareTo(Book other) {return (other.counter - this.counter);}@Overridepublic String toString() {return " name=" + name + ", isbn=" + isbn+ ", price=" + price + ", lended=" + lended + ", counter="+ counter + ", lendDate=" + lendDate + "]";}}

然后是 Manager

package com.lovo.BookManager;import java.util.ArrayList;import java.util.Arrays;import java.util.List;/** * @author Abe * @version 1.0 * @created 05-十一月-2011 15:58:35 */public class BookManager {private List<Book> list = new ArrayList<Book>();public BookManager() {// 添加图书作为测试数据list.add(new Book("111", "编程思想", 1.5));list.add(new Book("222", "鹿鼎记", 0.5));list.add(new Book("333", "育儿百科", 1.2));list.add(new Book("444", "寻秦记", 0.7));list.add(new Book("555", "斗罗大陆", 1.1));}/** * 方法：新增书籍 * @param Book */public boolean add(Book book) {if (findByISBN(book.getIsbn()) == null) {list.add(book);return true;}return false;}/** * 移除书籍 * @param isbn */public boolean deleteByISBN(String isbn) {if (findByISBN(isbn) == null) {return false;} else {list.remove(findByISBN(isbn));return true;}}/** * 方法：返回全部容器 * @return */public List<Book> findAll() {return list;}/** * 按isbn查找目标书籍 * @param isbn */public Book findByISBN(String isbn) {for (Book b : list) {if (b.getIsbn().equals(isbn)) {return b;}}return null;}public Book[] findTop10() {if (list != null) {Book[] tempBook = new Book[list.size()];tempBook = list.toArray(tempBook);Arrays.sort(tempBook); //匿名内部类借口 ABook[] top10 = new Book[list.size() < 10 ? list.size() : 10];System.arraycopy(tempBook, 0, top10, 0, top10.length);return top10;} else {return null;}}/** * 归还 * @param b * @return 租金 */public double getBackFromUser(String isbn) {if (findByISBN(isbn) != null) {return findByISBN(isbn).returnBack();}return 0;}/** * 借出 * @param b * @return 是否借书成功 */public boolean lendedToUser(String isbn) {if (findByISBN(isbn) != null) {return findByISBN(isbn).lendOut();}return false;}}

3.最后是控制台的功能验证

package com.lovo.BookManager;import java.util.List;import java.util.Scanner;/** * @author Abe * @version 1.0 * @created 05-十一月-2014 15:37:33 */public class SystemUI {public static void main(String[] args) {BookManager manager = new BookManager();Scanner sc1 = new Scanner(System.in);Scanner sc2 = new Scanner(System.in);do {int choice = 0;do {System.out.println("\n---------------\n");System.out.println("1. 新增图书");System.out.println("2. 删除图书");System.out.println("3. 修改图书");System.out.println("4. 查看所有图书");System.out.println("5. 查找图书");System.out.println("6. 借书");System.out.println("7. 还书");System.out.println("8. 查看排行榜");System.out.println("9. 退出系统");System.out.println("\n---------------\n");System.out.print("请选择: ");choice = sc2.nextInt();} while(choice < 1 || choice > 9);switch(choice) {case 1: System.out.print("请输入书的编号: ");String isbn1 = sc1.nextLine();System.out.print("请输入书的名称: ");String name = sc1.nextLine();System.out.print("请输入书的日租金: ");double price = sc2.nextDouble();Book newBook = new Book(isbn1, name, price);System.out.println(manager.add(newBook)? "添加成功!" : "添加失败!");break;case 2: System.out.print("请输入书的编号: ");String isbn2 = sc1.nextLine();System.out.println(manager.deleteByISBN(isbn2)? "删除成功!" : "删除失败!");break;case 3: break;case 4: List<Book> bookList = manager.findAll();System.out.println("名称\t\t日租金\t状态\t借出日期\t借出次数");for(Book b : bookList) {System.out.println(b.getName() + "\t\t" + b.getPrice() + "\t" + (b.isLended()? "已借出" : "未借出") + "\t" +b.getLendDate() + "\t" + b.getCounter());}break;case 5: System.out.print("请输入书的编号: ");String isbn3 = sc1.nextLine();Book temp = manager.findByISBN(isbn3);if(temp != null) {System.out.println("书名: " + temp.getName());System.out.println("日租金: " + temp.getPrice());System.out.println("借出状态: " + (temp.isLended()? "已借出" : "未借出"));System.out.println("借出日期: " + temp.getLendDate());System.out.println("借出次数: " + temp.getCounter());}else {System.out.println("没有此书!!!");}break;case 6: System.out.print("请输入书的编号: ");String isbn4 = sc1.nextLine();System.out.println(manager.lendedToUser(isbn4)? "借出成功!" : "借出失败!");break;case 7: System.out.print("请输入书的编号: ");String isbn5 = sc1.nextLine();System.out.println("请交纳租金: ￥" + manager.getBackFromUser(isbn5));break;case 8: Book[] list = manager.findTop10();System.out.println("名称\t\t日租金\t状态\t借出日期\t借出次数");for(Book b : list) {System.out.println(b.getName() + "\t\t" + b.getPrice() + "\t" + (b.isLended()? "已借出" : "未借出") + "\t" +b.getLendDate() + "\t" + b.getCounter());}break;case 9: System.exit(0);break;}} while(true);}}

除了修改，都能正常运行