[Java] (실습) 자바 로또 프로그램

import java.util.LinkedHashSet;
import java.util.Random;

class Lotto{
	private int[] arr; // 당첨번호
	
	public Lotto(){
		arr = new int[7];
		setArr();
	}
	
	public int[] getArr() {
		return arr;
	}

	public void setArr() {
		LinkedHashSet<Integer> a = new LinkedHashSet<>();
		Random rand = new Random();
		int cnt=0;
		
		//중복 없이 7개 숫자 저장
		while(a.size()<7) {
			a.add(rand.nextInt(45)+1);
		}
		
		for(Integer g : a) {
			arr[cnt] = g;
			cnt++;
		}
	}
	
	public void disp() {
		System.out.print("당첨번호 :"+ arr[0] +" "+ arr[1] +" "+arr[2] + " " + arr[3]+ " "+ arr[4]+ " "+ arr[5]+" 보너스 :"+arr[6]);
	}

	public void first() {
		System.out.println("=====1등 당첨번호=====");
		for(int i=0; i<arr.length-1; i++) {
			System.out.print(arr[i]+" ");
		}
		System.out.println();
	}
	
	public void second() {
		System.out.println("=====2등 당첨번호=====");
		for(int i=0; i<arr.length-1; i++) { 
			for(int j=0; j<arr.length; j++) {
				if(i == j) {
					System.out.print("* ");
				}
				else {
					System.out.print(arr[j]+" ");
				}
			}
			System.out.println();
		}
	}
	
	public void third() {
		System.out.println("=====3등 당첨번호=====");
		for(int i=0; i<arr.length-1; i++) {
			for(int j=0; j<arr.length-1; j++) {
				if(i == j) {
					System.out.print("* ");
				}
				else {
					System.out.print(arr[j]+" ");
				}
			}
			System.out.println();
		}
	}
	
	public void fourth() {
		System.out.println("=====4등 당첨번호=====");
		for(int i=0; i<arr.length-1; i++) {
			for(int j=i+1; j<arr.length-1; j++) {
				for(int k=0; k<arr.length-1; k++) {
					if(k == i) System.out.print("* ");
					else if(k == j) System.out.print("* ");
					else System.out.print(arr[k]+" ");
				}
				System.out.println();
			}
		}
	}
	
	public void fifth() {
		System.out.println("=====5등 당첨번호=====");
		for(int i=0; i<arr.length-1; i++) {
			for(int j=i+1; j<arr.length-1; j++) {
				for(int k=j+1; k<arr.length-1; k++) {
					for(int m=0; m<arr.length-1; m++) {
						if(m == i) System.out.print("* ");
						else if(m == j) System.out.print("* ");
						else if(m == k) System.out.print("* ");
						else System.out.print(arr[m]+" ");
					}
					System.out.println();
				}
			}
		}
	}
}

public class LottoProgram {
	public static void main(String[] args) {
		Lotto lotto = new Lotto();
		lotto.disp();
		System.out.println();
		lotto.first();
		System.out.println();
		lotto.second();
		System.out.println();
		lotto.third();
		System.out.println();
		lotto.fourth();
		System.out.println();
		lotto.fifth();
	}	
}