[JAVA] 메소드와 생성자를 이용한 가상 DB 관리

import java.util.Scanner;
class Product
{
	String code, name;
	int price, discount;
	Product(String code, String name, int price, int discount)
	{
		this.code=code;
		this.name=name;
		this.price=price;
		this.discount=discount;
	}
	Product(String code, String name, int price)
	{
		this.code=code;
		this.name=name;
		this.price=price;
		this.discount=0;
	}	
	void setDiscount(int discount){this.discount=discount;}
	int calcPrice(){return price-(price*discount/100);}

}
class Q1
{
	public static void main(String[] args)
	{
		Scanner sc=new Scanner(System.in);
		Product []p=new Product[5];

		p[0]=new Product("A001", "초코송이", 1000, 10);
		p[1]=new Product("A002", "참크래커", 1500, 20);
		p[2]=new Product("A003", "수미칩", 2000, 15);
		p[3]=new Product("B001", "밀키스", 1000);
		p[4]=new Product("B002", "레쓰비", 700);
		while(true)
		{
			System.out.print("메뉴 선택(1:상품조회, 2:할인율변경, 3:종료) : ");
			int menu=sc.nextInt();
			switch(menu)
			{
				case 1:
					System.out.println("상품코드\t상품명\t표준단가\t판매가");
					for(int i=0;i<5;i++)
					{
						System.out.println(p[i].code+"\t"+p[i].name+"\t"+p[i].price+"\t"+p[i].calcPrice());
					}
					break;
				case 2:
					System.out.print("할인율 변경할 상품코드 : ");
					String c=sc.next();
					System.out.print("변경 할인율 : ");
					int dis=sc.nextInt();
					for(int i=0; i<p.length; i++)
					{
						if(c.equals(p[i].code))
						{
							p[i].setDiscount(dis);
						}
					}
					System.out.println("변경되었습니다.");
					break;
				case 3:
					System.out.println("종료합니다.");
					break;
			}
			if(menu==3){break;}
		}
	}
}

는 과제