package com.yy.demo;import java.util.ArrayList;import java.util.Collections;import java.util.List;import java.util.Random;public class CollectionSort { private List<String> ls; public CollectionSort(){ ls=new ArrayList<String>(); } public static void main(String[] args) { CollectionSort cs=new CollectionSort(); System.out.println("--------排序前---------"); cs.createList(); cs.forEach(); System.out.println("--------排序后---------"); cs.listSort(); cs.forEach(); } public void listSort(){ Collections.sort(ls); } public void forEach(){ for (String string : ls) { System.out.println("字符串："+string); } } public void createList(){ Random random=new Random(); for (int i = 0; i < 10; i++) { String tmp; do{ tmp=getRandomString(random.nextInt(10)); }while(ls.contains(tmp)); ls.add(tmp); } } public String getRandomString(int length){ String originString="0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ"; StringBuffer sb=new StringBuffer(); Random random=new Random(); for (int i = 0; i < length; i++) { sb.append(originString.charAt(random.nextInt(originString.length()))); } return sb.toString(); }}