PerformLotterySnippet.java

/*
 * MIT License
 *
 * Copyright (c) 2017-2022 Ilkka Seppälä
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in all
 * copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 */

package math;

import java.util.ArrayList;
import java.util.Collections;

/**
 * PerformLotterySnippet.
 */
public class PerformLotterySnippet {

  /**
   * Generate random lottery numbers.
   *
   * @param numNumbers    how many performLottery numbers are available (e.g. 49)
   * @param numbersToPick how many numbers the player needs to pick (e.g. 6)
   * @return array with the random numbers
   */
  public static Integer[] performLottery(int numNumbers, int numbersToPick) {
    var numbers = new ArrayList<Integer>();
    for (var i = 0; i < numNumbers; i++) {
      numbers.add(i + 1);
    }
    Collections.shuffle(numbers);
    return numbers.subList(0, numbersToPick).toArray(new Integer[numbersToPick]);
  }
}