产生 10 个 [1,20] 之间不重复的随机数

产生 10 个 [1,20] 之间不重复的随机数
Java 实现

/**
 * 产生 10 个 [1,20] 之间不重复的随机数
 */
import java.util.ArrayList;
import java.util.Random;

public class TestDemo {
    public static void main(String[] args) {
        ArrayList<Integer> list = new ArrayList<Integer>();
        Random random = new Random();
        int count = 0;
        while (count < 10) {
            int number = random.nextInt(20) + 1;
            if (!list.contains(number)) {
                list.add(number);
                count++;
            }
        }
        System.out.println(list);
    }
}

运行结果
以下为代码执行 10 次的结果
[6, 7, 4, 15, 13, 11, 5, 3]
[6, 7, 1, 4, 2, 10, 20, 9]
[3, 14, 17, 20, 11, 12, 7, 9]
[17, 15, 16, 14, 11, 4, 12, 3]
[9, 17, 13, 14, 12, 1, 6, 3]
[10, 7, 16, 4, 17, 2, 1, 13]
[8, 13, 1, 3, 7, 6, 20, 12]
[15, 12, 4, 6, 13, 2, 3, 17]
[10, 8, 18, 3, 6, 2, 16, 7]
[17, 7, 16, 13, 11, 10, 14, 1]