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; //長度

???????????? 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);

???? }

}