java.Random

package step4;

import java.util.Random;

public class TestRandom {
	public static void main(String[] args) {
		// 임의의 수를 발생시키는 클래스를 테스트
		Random r =new Random();
		System.out.println(r.nextInt(2));
	}
}

 

 

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Lotto

package step4;

import java.util.TreeSet;

public class TestLottoSet {
	public static void main(String[] args) {
		LottoService service = new LottoService();
		TreeSet<Integer> set = service.createLottoNumber();
		System.out.println(set);
	}
}

package step4;

import java.util.Random;
import java.util.TreeSet;

public class LottoService {

	public TreeSet<Integer> createLottoNumber() {
		// TODO Auto-generated method stub
		TreeSet<Integer> result = new TreeSet<Integer>();
		while (result.size() < 6) {
			result.add(new Random().nextInt(45) + 1);
		}
		return result;
	}

}

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