自己一直在自学Java基础,期望向JavaWeb方向发展。自学了好长时间,每次基本上都不会怎么记录,昨天看了GitChat的推送,觉着应当把自己每天的学习记录下来,这样可以做到监督的作用。
今天这个是一个Java小练习,一个图书借阅系统,需要实现的功能有:
判断用户是否需要进行借书
在用户选择借书时,展示出图书列表
图书列表包含 图书序号、图书名称、借阅价格、作者
用户选择借书数量、并选择对应图书、借阅天数
计算出用户需支付金额
Book.java
package com.imooc;/** * 图书类 包含图书序号 名称 价格 * */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("~~~~~~~欢迎使用图书借阅系统~~~~~~~~ "); System.out.println("您是否要借书:1.是 >> 点击其他键退出"); BorrowBooks test = new BorrowBooks(); while (test.test1()) { System.out.println(">>>您可选择图书及其价目表:"); System.out.println("-------------------------------------------"); Book[] books = { new Book(0, "红楼梦", 12, "曹雪芹"), new Book(1, "西游记", 12, "吴承恩"), new Book(2, "汉乡", 12, "孑与2"), new Book(3, "大魏宫廷", 12, "贱宗首席"), new Book(4, "三国演义", 12, "罗贯中"), new Book(5, "水浒传", 12, "施耐庵") }; System.out.println("序号" + " " + "\t" + "书名" + " " + "\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("-->请输入你要借书的数量:"); 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(">>请输入第" + (i + 1) + "本书的序号:"); 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("您输入的图书序号不正确"); i = i - 1; BookNum = BookNum; } } System.out.println("->请输入借阅的天数:"); Scanner g = new Scanner(System.in); int bookDay = g.nextInt(); bookPrice = bookPrice * bookDay; System.out.println("------------借阅选书完成------------" + "\n" + "下面开始统计数据.........."); System.out.print("您借阅的图书" + 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("->请输入付款金额:"); System.out.println("------------"); Scanner x = new Scanner(System.in); int priceSpread = bookPrice - x.nextInt();//定义差价 while (bookPrice != x.nextInt()) System.out.println("------------" + "\n" + "输入错误,请重新输入金额!"); /* while (bookPrice != x.nextInt()) { if (bookPrice > x.nextInt()) { int priceSpread = bookPrice - x.nextInt();//定义差价 System.out.println("------------" + "\n" + "您已付款" + x.nextInt() + "元,还需支付" + priceSpread + "元"); } if (bookPrice <x.nextInt()) { int priceSpread = x.nextInt()-bookPrice ;//定义差价 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("------------感谢您的使用--------------"); System.out.println("………………继续借书请按1,退出请按其他键………………"); } else { System.out.println("您输入的借书数量为“0”,自动为您退出系统"); System.exit(0); } } } private static Object bookPrice(int nextInt) { // TODO Auto-generated method stub return null; } // 捕获输入参数不正确异常 public boolean test1() { try { Scanner z = new Scanner(System.in); if (z.nextInt() == 1) { return true; } else { return false; } } catch (Exception e1) { return false; } } }
在BorrowBooks.java这个Class中,下面这段代码本想实现判断用户输入的金额是否和应付金额一致,不一致时给出不同的回复,但是自己试了好多种方法,都没有实现,还是自己懂得太少:
while (bookPrice != x.nextInt()) { if (bookPrice > x.nextInt()) { int priceSpread = bookPrice - x.nextInt();//定义差价 System.out.println("------------" + "\n" + "您已付款" + x.nextInt() + "元,还需支付" + priceSpread + "元"); } if (bookPrice <x.nextInt()) { int priceSpread = x.nextInt()-bookPrice ;//定义差价 System.out.println("------------" + "\n" + "您已付款" + x.nextInt() + "元,找您" + priceSpread + "元"); } }
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