로또생성기

miniProject01\lottery.java

/*
 작성자: 고지민
*/
import java.util.Arrays;
import java.util.Random;
import java.util.Scanner;

public class Main {
    public static void main(String[] args) {

        Scanner input = new Scanner(System.in);
        int[] winning_number=createNumber();


        System.out.println("[로또 당첨 프로그램]\n");
        int lottery_amount=inputInt("로또 개수를 입력해 주세요.(숫자 1 ~ 10):",input,1,10);
        int[][] my_lottery=myLottery(lottery_amount);
        for(int i=0;i<lottery_amount;i++){
            System.out.printf("%c       ", (char)(i+65)); // Ascii
            printNumber(my_lottery[i]);
            System.out.println();
        }
        // winning number
        System.out.println("\n[로또 발표]");
        System.out.print("        ");
        printNumber(winning_number);
        System.out.println();
        // result
        System.out.println("\n[내 로또 결과]");
        for(int i=0;i<lottery_amount;i++){
            System.out.printf("%c       ", (char)(i+65)); // Ascii
            printNumber(my_lottery[i]);
            System.out.printf(" => %d개 일치\n",compareNumber(my_lottery[i],winning_number));
        }

    }

    public static int inputInt(String message,Scanner input,int min,int max){
        try{
            System.out.print(message);
            int value = input.nextInt();
            if (value<min||value>max){
                throw new Exception();
            }
            return value;
        }catch (Exception e){
            System.out.println("다시 입력해주세요.");
            return inputInt(message,input,min,max);
        }
    }
    public static void printNumber(int[] numbers){
        for(int i=0;i<numbers.length;i++){
            if(i<numbers.length-1)
                System.out.printf("%02d,",numbers[i]);
            else
                System.out.printf("%02d",numbers[i]);
        }
    }

    public static int[][] myLottery(int cnt){
        int[][] mylottery = new int[cnt][7];
        for(int i=0;i<cnt;i++){
            mylottery[i]=createNumber();
        }
        return mylottery;
    }

    public static int[] createNumber(){ // 7자리 넘버생성
        Random rnd = new Random();
        int[] created_number=new int[7];
        Arrays.fill(created_number,0);
        for(int i =0;i<7;i++){
            rnd.setSeed(System.currentTimeMillis() + rnd.nextInt(10000));
            created_number[i]=avoidDuplication(created_number,rnd);
        }
        Arrays.sort(created_number);
        return created_number;
    }

    public static int avoidDuplication(int[] arr,Random rnd){ //중복 넘버 방지
        int value =rnd.nextInt(45)+1;
        if (Arrays.stream(arr).anyMatch(i -> i==value))
            return avoidDuplication(arr,rnd);
        else
            return value;
    }
    public static int compareNumber(int[] arr1,int[] arr2){
        int cnt=0;
        for (int i=0;i< arr1.length;i++){
            if(arr1[i]==arr2[i]){
                cnt++;
            }
        }
        return cnt;
    }
}