需求如下 商品类 Item；具有成员变量 编号code String类型 商品编号 名称name String 类型 商品名称 类别type String 类型 商品的具体类别 价格price double 类型 商品的价格 总商品数量totalNum int 类型 商品的总商品数量1提供两个构造器 没有参数的构造器 创建一个以编号code名称name 作为形式参数的构造器2编写一个

public class Item { private String code; private String name; private String type; private double price; private static int totalNum = 0;

public Item() {
    totalNum++;
}

public Item(String code, String name) {
    this.code = code;
    this.name = name;
    totalNum++;
}

public String getCode() {
    return code;
}

public void setCode(String code) {
    this.code = code;
}

public String getName() {
    return name;
}

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

public String getType() {
    return type;
}

public void setType(String type) {
    this.type = type;
}

public double getPrice() {
    return price;
}

public void setPrice(double price) {
    this.price = price;
}

public static int getTotalNum() {
    return totalNum;
}

public static void setTotalNum(int totalNum) {
    Item.totalNum = totalNum;
}

public static void main(String[] args) {
    Item computer1 = new Item("666", "戴尔(DELL) 游戏笔记本");
    computer1.setType("游戏");
    computer1.setPrice(5499.00);
    
    Item computer2 = new Item("007", "苹果（Macbook pro）笔记本");
    computer2.setType("电脑,办公");
    computer2.setPrice(18000.00);
    
    System.out.println("商品1名称: " + computer1.getName());
    System.out.println("商品1价格: " + computer1.getPrice());
    
    System.out.println("商品2名称: " + computer2.getName());
    System.out.println("商品2价格: " + computer2.getPrice());
    
    System.out.println("总商品数量: " + Item.getTotalNum());
}