Java实现图书借阅系统

Java实现图书借阅系统

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：

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"

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 bookList = new ArrayList();

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 += http://((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

int priceSpread = x.nextInt()-bookPrice ;//定义差价

Syshttp://tem.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;

}

}

}

运行效果图

存在问题

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

int priceSpread = x.nextInt()-bookPrice ;//定义差价

System.out.println("------------" + "\n" + "您已付款"

+ x.nextInt() + "元，找您" + priceSpread + "元");

}

}

int priceSpread = x.nextInt()-bookPrice ;//定义差价

Syshttp://tem.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;

}

}

}

运行效果图

存在问题

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

int priceSpread = x.nextInt()-bookPrice ;//定义差价

System.out.println("------------" + "\n" + "您已付款"

+ x.nextInt() + "元，找您" + priceSpread + "元");

}

}

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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