package imooc_collection_map_demo;

import java.util.ArrayList;

import java.util.Collections;

import java.util.List;

import java.util.Random;

public class CollectionsTest {

     public static void main(String[] args) {

         List<String> stringList = new ArrayList<String>();

         Random random = new Random();

         String str = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ1234567890";

         for(int i = 0; i<10; i++){

             int len = random.nextInt(10) + 1; //长度

             int index;

             StringBuffer sb = new StringBuffer();

             do{

                 for (int j = 0; j<len; j++){

                     index = random.nextInt(62); //下表

                     sb.append(str.charAt(index));

                 }

             }while(stringList.contains(sb.toString()));

             stringList.add(sb.toString());

         }

         System.out.println("排序前： " + stringList);

         Collections.sort(stringList);

         System.out.println("排序后： " + stringList);

     }

}