JAVA程序設計(14.1)----- 圖書館管理系統 初步設計 內部功能篇
首先繪制思維導圖。右下的user臨時無論先……
先做Book。抽象化屬性，核心功能。
然後是繪制BookManager的主要功能
然後直接導出到Eclipse進行改動調整，完畢功能的內部結構例如以下：
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;
/**
* 構造器
*/
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;
}
/**
* 歸還
* @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;
}
/**
* 重寫比較的方法
*/
@Override
public int compareTo(Book other) {
return (other.counter - this.counter);
}
@Override
public String toString() {
return " name=" + name + ", isbn=" + isbn
+ ", price=" + price + ", lended=" + lended + ", counter="
+ counter + ", lendDate=" + lendDate + "]";
}
}然後是 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() {
// 加入圖書作為測試數據
list.add(new Book("111", "編程思想", 1.5));
list.add(new Book("222", "鹿鼎記", 0.5));
list.add(new Book("333", "育兒百科", 1.2));
list.add(new Book("444", "尋秦記", 0.7));
list.add(new Book("555", "鬥羅大陸", 1.1));
}
/**
* 方法：新增書籍
* @param Book
*/
public boolean add(Book book) {
if (findByISBN(book.getIsbn()) == null) {
list.add(book);
return true;
}
return false;
}
/**
* 移除書籍
* @param isbn
*/
public boolean deleteByISBN(String isbn) {
if (findByISBN(isbn) == null) {
return false;
} else {
list.remove(findByISBN(isbn));
return true;
}
}
/**
* 方法：返回所有容器
* @return
*/
public List<Book> findAll() {
return list;
}
/**
* 按isbn查找目標書籍
* @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); //匿名內部類借口 A
Book[] top10 = new Book[list.size() < 10 ? list.size() : 10];
System.arraycopy(tempBook, 0, top10, 0, top10.length);
return top10;
} else {
return null;
}
}
/**
* 歸還
* @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 是否借書成功
*/
public boolean lendedToUser(String isbn) {
if (findByISBN(isbn) != null) {
return findByISBN(isbn).lendOut();
}
return false;
}
}3.最後是控制臺的功能驗證
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. 新增圖書");
System.out.println("2. 刪除圖書");
System.out.println("3. 改動圖書");
System.out.println("4. 查看全部圖書");
System.out.println("5. 查找圖書");
System.out.println("6. 借書");
System.out.println("7. 還書");
System.out.println("8. 查看排行榜");
System.out.println("9. 退出系統");
System.out.println("\n---------------\n");
System.out.print("請選擇: ");
choice = sc2.nextInt();
} while(choice < 1 || choice > 9);
switch(choice) {
case 1:
System.out.print("請輸入書的編號: ");
String isbn1 = sc1.nextLine();
System.out.print("請輸入書的名稱: ");
String name = sc1.nextLine();
System.out.print("請輸入書的日租金: ");
double price = sc2.nextDouble();
Book newBook = new Book(isbn1, name, price);
System.out.println(manager.add(newBook)? "加入成功!" : "加入失敗!");
break;
case 2:
System.out.print("請輸入書的編號: ");
String isbn2 = sc1.nextLine();
System.out.println(manager.deleteByISBN(isbn2)? "刪除成功!" : "刪除失敗!");
break;
case 3:
break;
case 4:
List<Book> bookList = manager.findAll();
System.out.println("名稱\t\t日租金\t狀態\t借出日期\t借出次數");
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("請輸入書的編號: ");
String isbn3 = sc1.nextLine();
Book temp = manager.findByISBN(isbn3);
if(temp != null) {
System.out.println("書名: " + temp.getName());
System.out.println("日租金: " + temp.getPrice());
System.out.println("借出狀態: " + (temp.isLended()? "已借出" : "未借出"));
System.out.println("借出日期: " + temp.getLendDate());
System.out.println("借出次數: " + temp.getCounter());
}
else {
System.out.println("沒有此書!!!");
}
break;
case 6:
System.out.print("請輸入書的編號: ");
String isbn4 = sc1.nextLine();
System.out.println(manager.lendedToUser(isbn4)?
"借出成功!" : "借出失敗!");
break;
case 7:
System.out.print("請輸入書的編號: ");
String isbn5 = sc1.nextLine();
System.out.println("請交納租金: ￥" + manager.getBackFromUser(isbn5));
break;
case 8:
Book[] list = manager.findTop10();
System.out.println("名稱\t\t日租金\t狀態\t借出日期\t借出次數");
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);
}
}
除了改動，都能正常執行
JAVA程序設計(14.1)----- 圖書館管理系統 初步設計 內部功能篇