[고급자바] Lotto 과제

package study;
 
import java.util.HashSet;
import java.util.Scanner;
import java.util.Set;
 
public class Lotto {
    public static void main(String[] args) {
        
        Scanner scanner = new Scanner(System.in);
        
        while(true) {
            
            System.out.println("===========================");
            System.out.println("Lotto 프로그램");
            System.out.println("--------------");
            System.out.println("1.Lotto 구입");
            System.out.println("2.프로그램 종료");
            System.out.println("===========================");    
            System.out.print("메뉴선택: ");
            int menuNum = Integer.parseInt(scanner.nextLine());
            
            if(menuNum == 1) {
                BuyLotto();
            } else if (menuNum == 2) {
                System.out.println("감사합니다."); 
                break;
            } else {
                System.out.println("입력 오류");
                break;
            }
            
        }        
    }
    
    public static void BuyLotto( ) {
        
        Scanner scanner = new Scanner(System.in);
        
        System.out.println("Lotto 구입 시작");
        System.out.println("(1000원에 로또번호 하나입니다.)");
        System.out.print("금액 입력: ");
        int money = Integer.parseInt(scanner.nextLine());
        
        System.out.println("행운의 로또번호는 아래와 같습니다.");
        
        if (money > 1000) {
            for(int i=1; i<=money/1000; i++) {
                Set<Integer> lotto = new HashSet<>(); //중복제거
                while (lotto.size() < 6) {
                    int random = (int)(Math.random()*45+1);
                    lotto.add(random);
                }
                System.out.println(lotto);
            }
            System.out.println();
            System.out.println("받은 금액은 " + money + "원이고, 거스름돈은 " + money%1000 + "입니다.");
            System.out.println();
        }
        
        
        
    }
 
}