[JAVA]최종테스트 (로또)

1.ArrayList

package algo;

import java.util.ArrayList;

public class Lotto01 {
    public static void main(String[] args) {
        // 배열 vs 컬렉션
        //int -> Integer
        //double -> Double
        //String
        ArrayList<Integer> arr = new ArrayList();
        arr.add(1);
        arr.add(3);
        arr.add(5);

        System.out.println(arr.get(0));
        System.out.println(arr.get(1));
        System.out.println(arr.get(2));

    }
}

import java.util.ArrayList;
import java.util.Random;


public class Lotto01 {
    public static void main(String[] args) {
        // 배열 vs 컬렉션
        //int -> Integer
        //double -> Double
        //String
        Random rand = new Random();
        int arr[] = new int[6];
        int n;

        //2. 로또 번호 받기

        //1회전
        n = 30;
        arr[0] = n;

        //2회전
        n = 10;
        arr[1] = n;

        //3회전
        n = 7;
        arr[2] = n;

        //4회전
        n = 6;
        arr[3] = n;

        //5회전
        n = 8;
        arr[4] = n;

        //6회전
        n = 17;
        arr[5] = n;

        System.out.println(arr[0]);
        System.out.println(arr[1]);
        System.out.println(arr[2]);
        System.out.println(arr[3]);
        System.out.println(arr[4]);
        System.out.println(arr[5]);
    }

}

//1회전
        n = 30;
        arr[0] = n;

        //2회전
        n = 30;
        arr[1] = n;
        if (n == arr[0]) {
            n = 30;
            arr[1] = n;
        }

       
        //3회전
        n = 30;
        if (n == arr[0]) {
            n = 20;
        }
        if (n == arr[1]) {
            n = 10;
        }
        arr[2] = n;

        //4회전
        n = 30;
        if (n == arr[0]) {
            n = 20;
        }
        if (n == arr[1]) {
            n = 10;
        }
        if (n == arr[2]) {
            n = 1;
        }
        arr[3] = n;

        //5회전
        n = 30;
        if (n == arr[0]) {
            n = 20;
        }
        if (n == arr[1]) {
            n = 10;
        }
        if (n == arr[2]) {
            n = 1;
        }
        if (n == arr[3]) {
            n = 2;
        }
        arr[4] = n;

        //6회전
        n = 30;
        if (n == arr[0]) {
            n = 20;
        }
        if (n == arr[1]) {
            n = 10;
        }
        if (n == arr[2]) {
            n = 1;
        }
        if (n == arr[3]) {
            n = 3;
        }
        arr[5] = n;

        System.out.println(arr[0]);
        System.out.println(arr[1]);
        System.out.println(arr[2]);
        System.out.println(arr[3]);
        System.out.println(arr[4]);
        System.out.println(arr[5]);
    }

}

import java.util.ArrayList;
import java.util.Random;


public class Lotto01 {
    public static void main(String[] args) {
        // 배열 vs 컬렉션
        //int -> Integer
        //double -> Double
        //String
        Random rand = new Random();
        int arr[] = new int[6];
        int n;
        int r = 0;
        int count = 0;
        rand = new Random();

        //2. 로또 번호 받기

        //1회전

        n = rand.nextInt(45) + 1;
        arr[0] = n;


        //2회전
        n = rand.nextInt(45) + 1;
        if (n == arr[0]) {
            count++;
        }
        if (count == 0) {
            arr[1] = n;
        }
        count = 0;

        //3회전
        n = rand.nextInt(45) + 1;
        if (n == arr[0]) {
            count++;
        }
        if (n == arr[1]) {
            count++;
        }
        if (count == 0) {
            arr[2] = n;
        }
        count = 0;

        //4회전
        n = rand.nextInt(45) + 1;
        if (n == arr[0]) {
            count++;
        }
        if (n == arr[1]) {
            count++;
        }
        if (n == arr[2]) {
            count++;
        }
        if (count == 0) {
            arr[3] = n;
        }
        count = 0;

        //5회전
        n = rand.nextInt(45) + 1;
        if (n == arr[0]) {
            count++;
        }
        if (n == arr[1]) {
            count++;
        }
        if (n == arr[2]) {
            count++;
        }
        if (n == arr[3]) {
            count++;
        }
        if (count == 0) {
            arr[4] = n;
        }
        count = 0;

        //6회전
        n = rand.nextInt(45) + 1;
        if (n == arr[0]) {
            count++;
        }
        if (n == arr[1]) {
            count++;
        }
        if (n == arr[2]) {
            count++;
        }
        if (n == arr[3]) {
            count++;
        }
        if (n == arr[4]) {
            count++;
        }
        if (count == 0) {
            arr[5] = n;
        }
        count = 0;

        System.out.println(arr[0]);
        System.out.println(arr[1]);
        System.out.println(arr[2]);
        System.out.println(arr[3]);
        System.out.println(arr[4]);
        System.out.println(arr[5]);
    }

}

public class SetLotto01 {
    public static void main(String[] args) {
        Random rand = new Random();
        HashSet<Integer> set = new HashSet<Integer>();

        set.add(1);
        set.add(2);
        set.add(3);
        set.add(4);
        set.add(5);
        set.add(6);

        System.out.println(set);
    }
}

package test;

import java.util.HashSet;
import java.util.Random;

public class SetLotto01 {
    public static void main(String[] args) {
        Random rand = new Random();
        HashSet<Integer> set = new HashSet<Integer>();
        int number;
        
        number = rand.nextInt(45) + 1;
        set.add(number);
        
        number = rand.nextInt(45) + 1;
        set.add(number);
        
        number = rand.nextInt(45) + 1;
        set.add(number);
        
        number = rand.nextInt(45) + 1;
        set.add(number);
        
        number = rand.nextInt(45) + 1;
        set.add(number);
        
        number = rand.nextInt(45) + 1;
        set.add(number);

        System.out.println(set);
    }
}

package test;

import java.util.HashSet;
import java.util.Random;

public class SetLotto01 {
    public static void main(String[] args) {
        Random rand = new Random();
        HashSet<Integer> set = new HashSet<Integer>();
        int number;

        for (int n = 6; set.size() < n; ) {

            number = rand.nextInt(45) + 1;
            set.add(number);
        }
        System.out.println(set);
    }
}