Java在匹配游戏中随机填充数组

Question

我有一个包含 9 个值的数组。我想用这些值随机填充另一个大小为 18 的数组，因为它们应该只出现两次。

String[] cards = {"1","2","3","4","5","6","7","8","9"};

Answer 1

这是我的 LazyRandomizer 类的结果。

[7, 5, 4, 7, 9, 3, 8, 1, 1, 3, 5, 4, 6, 2, 6, 2, 8, 9]

这是代码。

import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collections;
import java.util.List;

public class LazyRandomizer {

    public static void main(String[] args) {
        String[] cards = { "1", "2", "3", "4", "5", "6", "7", "8", "9" };
        List<String> randomCards = new ArrayList<>();
        randomCards.addAll(Arrays.asList(cards));
        randomCards.addAll(Arrays.asList(cards));
        Collections.shuffle(randomCards);
        System.out.println(Arrays.toString(randomCards
                .toArray(new String[randomCards.size()])));
    }

}