个回答

• _希斯莱杰

  2016-10-10 13:44:48

  已采纳

  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);

  }

  }

  }

  
  

  1