Question

求帮忙，用java面向对象的思想写一个购书系统，输出结果如果图：

Answer 1

有时间帮你搞个

import java.util.Calendar;
import java.util.Scanner;
/*
 * 功能说明，只能输入1 2 或者3如果输入其他就视为下订单或者取消订单
 */
public class ShoppingSystem {
    private static final String SPACE="        ";
    private int count=1;
    private boolean go =true;
    
    int[] book_p =new int[3];
    int[] book_n = new int[3];
    
    private book[] books = {
            new book(1, "Java教程", 30.6, 30),
            new book(2, "JSP 指南", 42.1, 40),
            new book(3, "SSH 架构", 47.3, 15)
            };
    
    //图书列表
    public void booklist(){
        System.out.println("图书列表：");
        System.out.println("图书编号  图书名称     图书单价 库存数量");
        System.out.println("-----------------------------------------");
        for (int i = 0; i < books.length; i++) {
            System.out.println(books[i].id+SPACE+books[i].name+SPACE+books[i].moneny+SPACE+books[i].number);
        }
        System.out.println("-----------------------------------------");
    }
    
    //购买行为
    public void buy(){
        Scanner in = new Scanner(System.in);
        
        try {
            int chooses; 
            while(go){
                System.out.println("请输入图书的编号选择图书");
                chooses = in.nextInt();
                if(chooses == 1 || chooses == 2 || chooses == 3){
                    
                }
                else{ 
                    buylist();
                    go =false;
                    return;
                }
                
                if(chooses == 1){
                    book_p[0]=1;
                    System.out.print("请输入购买图书的数量 ");
                    chooses = in.nextInt();
                    if(chooses <= books[0].number){
                        book_n[0]=book_n[0]+chooses;
                    }
                }else if(chooses == 2){
                    book_p[1]=1;
                    System.out.print("请输入购买图书的数量 ");
                    chooses = in.nextInt();
                    if(chooses <= books[1].number){
                        book_n[1]=book_n[1]+chooses;
                    }
                }else if(chooses == 3){
                    book_p[2]=1;
                    System.out.print("请输入购买图书的数量 ");
                    chooses = in.nextInt();
                    if(chooses <= books[2].number){
                        book_n[2]=book_n[2]+chooses;
                    }
                }                    
            }
        } catch (Exception e) {
            // TODO: handle exception
        }
    }
    
    //订单列表
    private void buylist(){
        double sum=0;
        System.out.println(SPACE+"图书订单：");
        System.out.println("图书订单号:"+count);
        System.out.println("图书名称 购买数量 图书单价");
        System.out.println("-------------------------------");
        for (int i = 0; i < 3; i++) {
            if(book_p[i] != 0){
                System.out.println(books[i].name + SPACE+book_n[i]+SPACE+books[i].moneny);
                sum =sum + book_n[i]*books[i].moneny;
            }
        }
        System.out.println("-------------------------------");
        System.out.print("订单的总额                       ");
        System.out.println(sum);
        
        Calendar c = Calendar.getInstance();
        System.out.println("日期"+c.getTime());
    }
    public static void main(String[] args) {
        ShoppingSystem sh = new ShoppingSystem();
        sh.booklist();
        sh.buy();
    }
    
    class book{
        private int id;
        private String name;
        private double moneny;
        private int number;
        
        public book(int id, String name, double moneny, int number) {
            this.id = id;
            this.name = name;
            this.moneny = moneny;
            this.number = number;
        }

        public int getId() {
            return id;
        }

        public void setId(int id) {
            this.id = id;
        }

        public String getName() {
            return name;
        }

        public void setName(String name) {
            this.name = name;
        }

        public double getMoneny() {
            return moneny;
        }

        public void setMoneny(double moneny) {
            this.moneny = moneny;
        }

        public int getNumber() {
            return number;
        }

        public void setNumber(int number) {
            this.number = number;
        }
        
        
    }

}

 

追问

int[] book_p =new int[3];
int[] book_n = new int[3];
定义这两个数组有什么用，没看懂！！

追答

一个表示你到底买了哪几种书，一个表示对应的书你买了几本

Answer 2

直接写个jsp页面把

Answer 3

你好！有什么问题吗