package shops;
import java.util.Arrays;
import java.util.Scanner;

public class ShoppingSystem {
	static class Good {
	    private int id;
	    private double pirce;
	    private String name;
	    
	//无参构造方法
	    public Good() {
	    }
	    
	//有参构造方法
	    public Good(int id, double pirce, String name) {
	        this.id = id;
	        this.pirce = pirce;
	        this.name = name;
	    }
	    
	//将toString方法重写
	    @Override
	    public String toString() {
	        return   id +"\t" +pirce + "\t"+name ;
	    }

	    public int getId() {
	        return id;
	    }

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

	    public double getPirce() {
	        return pirce;
	    }

	    public void setPirce(double pirce) {
	        this.pirce = pirce;
	    }

	    public String getName() {
	        return name;
	    }

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


    public static void main(String[] args) {

        //1.定义对象数组并赋值
        Good[] goods = new Good[3];
        goods[0] =new Good(1000,10.0,"荔枝") ;
        goods[1] =new Good(1001,200.0,"车厘子") ;
        goods[2] =new Good(1002,500.0,"榴莲") ;

        //2.创建Scanner对象并调用获取控制台输入信息的方法
        Scanner sc = new Scanner(System.in);

        //3.定义循环条件
        boolean isWork=true;
        //4.定义操作商品编号
        int indexNum;
        //5.定义操作的商品编号的下标
        int index=0;

        while (isWork){
            System.out.println("===================超市管理系统==================");
            System.out.println("1:货物清单\t2:增加货物\t3:删除货物\t4:修改货物\t5:退出");
            System.out.println("输出你要操作的编号：");
            int choseNum = sc.nextInt();
            System.out.println();

               //1:货物清单
            if(choseNum==1){
                System.out.println("===================商品清单==================");
                System.out.println("商品编号\t商品单价\t商品名称");
                for (int i = 0; i <goods.length ; i++) {
                    if(goods[i]!=null){
                        System.out.println(goods[i].toString());
                    }
                }
                //2:增加货物
            }else if(choseNum==2){
                System.out.println("您选择的是添加商品功能");
                //2.1增加对象数组长度
                goods=Arrays.copyOf(goods,goods.length+1);
                //2.2创建新对象并把对象放入新数组中
                goods[3]= new Good();
                //goods[3]=goods4;
                //2.3动态赋值
                System.out.print("输入商品编号ID：");
                goods[goods.length-1].setId(sc.nextInt());
                System.out.print("输入商品单价：");
                goods[goods.length-1].setPirce(sc.nextDouble());
                System.out.print("输入商品名称：");
                goods[goods.length-1].setName(sc.next());
                System.out.println("添加成功");

                //3:删除货物
            }else if(choseNum==3){
                System.out.println("您选择的是删除功能");
                System.out.println("输入要删除的商品编号ID");
                indexNum=sc.nextInt();
                //找到对应商品编号的对象并赋值为null 。
                for (int i = 0; i <goods.length ; i++) {
                    if(indexNum == goods[i].getId()){
                            goods[i]=null;
                    }
                }
                System.out.println("删除成功");
                //4:修改货物
            }else if(choseNum==4){
                System.out.println("选的是修改功能");
                System.out.println("输入你要修改的商品编号ID");
                indexNum=sc.nextInt();
                //找到对应商品编号的一维数组。
                for (int i = 0; i <goods.length ; i++) {
                    if(indexNum==goods[i].getId()){
                        index=i;
                    }
                }
                System.out.println("输入新的商品编号");
                 goods[index].setId(sc.nextInt());
                System.out.println("输入商品单价");
                goods[index].setPirce(sc.nextDouble());
                System.out.println("输入商品名称");
                goods[index].setName(sc.next());
                System.out.println("修改成功");
                //5:退出
            }else if(choseNum==5){
                isWork=false;
            }else{
                System.out.println("输入错误，请选择1-5的数字！");
            }
        }

    }
}