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main方

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());
    }
}
``