Obtain 10 random integers from 0 to 20, and no repetition is required

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package Test;

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

public class Test01 {
	/**
	 * 编写一个程序：获取10个随机的0~20的整数，且要求不重复
	 * 分析：
	 * 	1、建立一个HashSet集合
	 * 	2、使用Random中的nextInt(n)方法随机产生10个整数
	 */
	public static void main(String[] args) {
		//	1、建立一个HashSet集合
		HashSet<Integer> hs = new HashSet<>();
		//2、使用Random类随机产生10个1~20的整数
		Random r = new Random();
		
		while(hs.size()<10) {
			hs.add(r.nextInt(21));
		}
		
		System.out.println(hs);
	}

}

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