ZeroReport07.java

import java.util.Arrays;
import java.util.Comparator;
import java.util.Scanner;
// 이진영
class CustomComparator implements Comparator<String> {
  @Override
  public int compare(String o1, String o2) {
    return o1.compareTo(o2);
  }
}
public class ZeroReport07 {
  static int j = 0;
  public static void main(String[] args) {
    Scanner sc = new Scanner(System.in);
    StringBuffer sb = new StringBuffer();

    System.out.println("[로또 당첨 프로그램]\n");
    int input = limit(sc);

    String number;
    String[] arr = new String[input * 7];
    
    for(char i = 65; i < 65 + input; i++){
      arr[j] = String.valueOf(i);
      j++;
      while(j % 7 != 0){
        number = null;
        arr[j] = rdNum(number , arr, j);
        j++;
      }
      Arrays.sort(arr, j - 6 < 0? 1 : j - 6 , j, new CustomComparator());
    }
    int a = 1;

    for(int i = 1; i <= arr.length / 7; i++){
      if(i == 1) {
        sb.append(arr[0]+"   ");
      }else{
        sb.append(arr[a]+"   ");
        a++;
      }
      while(a < i*7){
        if(a + 1 == i*7){
          sb.append(arr[a] + "\n");
        }else{
          sb.append(arr[a] + ",");
        }
        a++;
      }
    }
    sb.append("\n");
    String[] rotto = new String[6];
    for(int i = 0; i < rotto.length; i++){
      number = null;
      rotto[i] = rdNum(number , rotto, i);
    }
    Arrays.sort(rotto);
    sb.append("[로또 발표]\n");
    sb.append("   " + Arrays.toString(rotto).replace("[", "").replace("]", "").trim() + "\n\n");
    int cnt = 0;

    for(int i = 0; i< arr.length; i++){
      if(i == 0){
        sb.append(arr[i] + "   ");
      }else if(i % 7 == 0){
        sb.append(arr[i] + "   ");
      }else{
        number = arr[i];
        for(int k = 0; k < rotto.length; k++){
          if(number.equals(rotto[k])){
            cnt++;
          }
        }
        if((i+1) % 7 == 0){
          sb.append(number + " => " + cnt +"개 일치\n");
          cnt = 0;
        }else{
          sb.append(number + ",");
        }
      }
      
    }
    System.out.println(sb);
  }

  private static boolean exists(String n[], String number , int j) {
    for (int i = 0; i < j; i++) {
        if(n[i].compareTo(number) == 0){
          return true;
        }
    }
    return false;
  }
  public static String rdNum(String number , String[] arr , int i){
    do {
      number = String.valueOf((int) (Math.random()*45) + 1);
    }while(exists(arr,number,i));

    return number.length() == 1 ? "0" + number : number;
  }
  
  public static int limit(Scanner sc){
    System.out.print("로또 개수를 입력해 주세요.(숫자 1 ~ 10):");
    int num = 0;
    boolean checkB;
    do{
      num = 0;
      checkB = true;
      try{
        num = Integer.valueOf(sc.next());
      }catch(NumberFormatException ex){
        System.out.print("숫자만을 입력해주시기 바랍니다.");
        checkB = false;
      }finally{
        if(checkB){
          if(num < 1 || 10 < num){
            System.out.print("로또 개수 제한은 1 - 10개 입니다. ");
            checkB = false;
          }
        }
      }
    }while(!checkB);

    return num;
  }
}