Java Map集合使用方法介绍（2）——商品信息管理

Java
public class Goods {
private String id;//商品编号
private String name;//商品名称
private double price;//商品价格

//构造方法
public Goods(String id,String name,double price){
this.id = id;
this.name = name;
this.price = price;
    }

//getter和setter方法
public String getId() {
return id;
    }

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

public String getName() {
return name;
    }

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

public double getPrice() {
return price;
    }

public void setPrice(double price) {
this.price = price;
    }
public String toString(){
return "商品编号："+id+"，商品名称："+name+"，商品价格"+price;
    }

}

Java
import java.util.HashMap;
import java.util.Iterator;
import java.util.Map;
import java.util.Scanner;
public class GoodsTest {

    public static void main(String[] args) {
        Scanner console = new Scanner(System.in);
        // 定义HashMap对象
        Map<String, Goods> goodsMap = new HashMap<String, Goods>();
        System.out.println("请输入三条商品信息");
        int i = 0;
        while (i < 3) {
            System.out.println("请输入第" + (i + 1) + "条商品信息");
            System.out.println("请输入商品编号");
            String goodsId = console.next();
            // 判断商品编号id是否存在
            if (goodsMap.containsKey(goodsId)) {
                System.out.println("该商品编号已经存在！请重新输入！");
                continue;
            }
            System.out.println("请输入商品名称");
            String goodsName = console.next();
            System.out.println("请输入商品价格");
            double goodsPrice = 0;
            try {
                goodsPrice = console.nextDouble();
            } catch (java.util.InputMismatchException e) {
                System.out.println("商品价格的格式不正确，请输入数值型数据！");
                console.next();
                continue;

            }

            Goods goods = new Goods(goodsId, goodsName, goodsPrice);
            // 将商品信息添加到HashMap中
            goodsMap.put(goodsName, goods);
            i++;
        }
        // 遍历Map,输出商品信息
        System.out.println("商品的全部信息为：");
        Iterator<Goods> itGoods = goodsMap.values().iterator();
        while (itGoods.hasNext()) {
            System.out.println(itGoods.next());
        }

    }

}