hihoCoder-随机产生数字并排序

随机产生20个数并排序输出
程序如下：
package pack;
import java.util.HashSet;
import java.util.Iterator;
import java.util.Random;
import java.util.Set;
import java.util.TreeSet;

public class Main {


    public static void main(String[] args) {
        Set numberSet1 = new HashSet();         //HashSet里不能有重复的
        Random rdm = new Random();
        while(numberSet1.size()<20) {
            int getNum=Math.abs(rdm.nextInt()%26)+97;    //产生97到122的数
            numberSet1.add(getNum);
        }
        /*for(Iterator it = numberSet1.iterator();it.hasNext();) {
            System.out.println(it.next());
        }*/
        Set numberSet = new TreeSet();        //TreeSet是能自动排序的
        numberSet.addAll(numberSet1);
        for(Iterator it = numberSet.iterator();it.hasNext();) {
            System.out.println(it.next());
        }
    }

}