随机产生20个字符串并且字符串不能重复 且进行排序

注：treeSet本身就具有 去重排序作用import java.util.HashSet;import java.util.Random;import java.util.Set;import java.util.TreeSet;public class bb { public static void main(String[] args) { Set noreapeat =new TreeSet(); Random rdm = new Random(); while (noreapeat.size()<20){ int bb =Math.abs(rdm.nextInt())%26+97; char cc =(char)bb; noreapeat.add(cc); } System.out.println(noreapeat); }}