图书订购系统

图书订购系统

package unit4;

import java.util.Scanner;

public class ECommerce {
    static final String[] MENUS = {
            "查询所有商品",
            "根据商品编号查询图书",
            "购买图书",
            "取消购买",
            "查询购买情况",
            "退出系统"
    };
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        while (true){
            System.out.println("******商品管理系统******");
            for (int i = 0; i < MENUS.length; i++) {
                System.out.println((i + 1) + "." +MENUS[i]);
            }
            System.out.println("**********************");
            System.out.println("请选择(1-"+MENUS.length + ")");
            //输入
            int value = scanner.nextInt();
            if (value < 1 || value >MENUS.length){
                System.out.println("您的选择不正确");
                continue;
            }
            String  str = "您选择了：%s业务\r\n";
            System.out.printf(str,MENUS[value - 1]);
            if (value == MENUS.length){//退出系统
                break;
            }
        }
    }
}