Java實現圖書借閱系統
今天這個是一個Java小練習，一個圖書借閱系統，需要實現的功能有：
- 判斷用戶是否需要進行借書
- 在用戶選擇借書時，展示出圖書列表
- 圖書列表包含 圖書序號、圖書名稱、借閱價格、作者
- 用戶選擇借書數量、並選擇對應圖書、借閱天數
- 計算出用戶需支付金額
Book.java
package com.imooc;
/**
* 圖書類 包含圖書序號 名稱 價格
* */
public class Book {
private int id;
private String name;
private double price;
private String author;
public Book(int id, String name, double price, String author) {
// TODO Auto-generated constructor stub
this.id = id;
this.setName(name);
this.price = price;
this.author = author;
}
public void setId(int id) {
this.id = id;
}
public int getId() {
return id;
}
public void setPrice(double price) {
this.price = price;
}
public double getPrice() {
return price;
}
public void setAuthor(String author) {
this.author = author;
}
public String getAuthor() {
return author;
}
public void setName(String name) {
this.name = name;
}
public String getName() {
return name;
}
}
BorrowBooks.java
package com.imooc;
import java.util.ArrayList;
import java.util.List;
import java.util.Scanner;
public class BorrowBooks {
/**
* @param args
*/
public static void main(String[] args) {
// TODO Auto-generated method stub
System.out.println("~~~~~~~歡迎使用圖書借閱系統~~~~~~~~ ");
System.out.println("您是否要借書：1.是 >> 點擊其他鍵退出");
BorrowBooks test = new BorrowBooks();
while (test.test1()) {
System.out.println(">>>您可選擇圖書及其價目表：");
System.out.println("-------------------------------------------");
Book[] books = { new Book(0, "紅樓夢", 12, "曹雪芹"),
new Book(1, "西遊記", 12, "吳承恩"),
new Book(2, "漢鄉", 12, "孑與2"),
new Book(3, "大魏宮廷", 12, "賤宗首席"),
new Book(4, "三國演義", 12, "羅貫中"),
new Book(5, "水滸傳", 12, "施耐庵") };
System.out.println("序號" + " " + "\t" + "書名" + " " + "\t"
+ "租金" + " " + "\t" + "作者");
for (Book book : books) {
if (book.getClass().equals(Book.class)) {
System.out.println(book.getId() + "\t" + "\t"
+ book.getName() + "\t" + "\t" + book.getPrice()
+ "/天" + "\t" + "\t" + book.getAuthor() + "/著");
}
}
System.out.println("-------------------------------------------");
System.out.println("-->請輸入你要借書的數量：");
Scanner zScanner = new Scanner(System.in);
int BookNum = zScanner.nextInt();
if (BookNum > 0) {
List<Book> bookList = new ArrayList<Book>();
int add = 0;
int bookPrice = 0;
for (int i = 0; i < BookNum; i++) {
System.out.println(">>請輸入第" + (i + 1) + "本書的序號：");
int num = zScanner.nextInt();
try {
bookList.add(books[num]);
System.out.println("----成功添加："
+ bookList.get(add).getName());
if (books[num].getClass().equals(Book.class)) {
bookPrice += ((Book) bookList.get(add)).getPrice();
}
add++;
} catch (Exception e) {
// TODO: handle exception
System.out.println("您輸入的圖書序號不正確");
i = i - 1;
BookNum = BookNum;
}
}
System.out.println("->請輸入借閱的天數：");
Scanner g = new Scanner(System.in);
int bookDay = g.nextInt();
bookPrice = bookPrice * bookDay;
System.out.println("------------借閱選書完成------------" + "\n"
+ "下面開始統計數據..........");
System.out.print("您借閱的圖書" + BookNum + "本：" + " ");
for (Book book : bookList) {
System.out.println(book.getName() + " " + "\n");
}
System.out.println();
System.out.println("共租用：" + bookDay + " 天");
System.out.println("需要付款：" + bookPrice + " 元");
System.out.println("->請輸入付款金額：");
System.out.println("------------");
Scanner x = new Scanner(System.in);
int priceSpread = bookPrice - x.nextInt();//定義差價
while (bookPrice != x.nextInt())
System.out.println("------------" + "\n" + "輸入錯誤，請重新輸入金額！");
/*
while (bookPrice != x.nextInt())
{
if (bookPrice > x.nextInt()) {
int priceSpread = bookPrice - x.nextInt();//定義差價
System.out.println("------------" + "\n" + "您已付款"
+ x.nextInt() + "元，還需支付" + priceSpread + "元");
}
if (bookPrice <x.nextInt()) {
int priceSpread = x.nextInt()-bookPrice ;//定義差價
System.out.println("------------" + "\n" + "您已付款"
+ x.nextInt() + "元，找您" + priceSpread + "元");
}
*/
System.out.println("------------");
System.out.println(" 交易成功！");
System.out.println();
System.out.println("------------感謝您的使用--------------");
System.out.println("………………繼續借書請按1，退出請按其他鍵………………");
} else {
System.out.println("您輸入的借書數量為“0”，自動為您退出系統");
System.exit(0);
}
}
}
private static Object bookPrice(int nextInt) {
// TODO Auto-generated method stub
return null;
}
// 捕獲輸入參數不正確異常
public boolean test1() {
try {
Scanner z = new Scanner(System.in);
if (z.nextInt() == 1) {
return true;
} else {
return false;
}
} catch (Exception e1) {
return false;
}
}
}
運行效果圖
存在問題
在BorrowBooks.java這個Class中，下面這段代碼本想實現判斷用戶輸入的金額是否和應付金額一致，不一致時給出不同的回復，但是自己試瞭好多種方法，都沒有實現，還是自己懂得太少：
while (bookPrice != x.nextInt())
{
if (bookPrice > x.nextInt()) {
int priceSpread = bookPrice - x.nextInt();//定義差價
System.out.println("------------" + "\n" + "您已付款"
+ x.nextInt() + "元，還需支付" + priceSpread + "元");
}
if (bookPrice <x.nextInt()) {
int priceSpread = x.nextInt()-bookPrice ;//定義差價
System.out.println("------------" + "\n" + "您已付款"
+ x.nextInt() + "元，找您" + priceSpread + "元");
}
}
以上就是本文的全部內容，希望對大傢的學習有所幫助，也希望大傢多多支持WalkonNet。