package com.imooc;

import java.util.ArrayList;

import java.util.Collections;

import java.util.List;

import java.util.Random;

public class TestRandom {

public static List<String> randomstring=new ArrayList<String>();

public static void testRandomString(){

Random random=new Random();

String str="QWERTYUIOPASDFGHJKLZXCVBNMqwertyuiopasdfghjklzxcvbnm1234567890";

for(int i=0;i<10;i++){

StringBuilder sb=new StringBuilder();

int length;

do{

length=random.nextInt(11);

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

sb=sb.append(str.charAt(random.nextInt(62)));

}

}while(length==0||randomstring.contains(sb));

randomstring.add(sb.toString());

}

}

public static void main(String[] args) {

TestRandom.testRandomString();

System.out.println("--------未排序前的字符串--------");

for (String str : randomstring) {

System.out.println(str);

}

Collections.sort(randomstring);

System.out.println("--------排序后的字符串--------");

for (String str : randomstring) {

System.out.println(str);

}

}

}