/**

• 1、创建完List<String>之后，往其中添加十条随机的字符串
• 2、每条字符串的长度为10以内的随机整数
• 3、每条字符串的每个字符都为随机生成的字符，字符可以重复
• 4、每条随机字符串不可重复

• @param args
  */
  public void testSort3(){
  List<String> stringList = new ArrayList<String>();
  Random random = new Random();
  String stringBase = "0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ";
  for(int i=0; i<10; i++){
  String toadd;
  do{
  StringBuilder sb = new StringBuilder();
  int k = random.nextInt(10);
  for(int j=0; j<k; j++){
  int l = random.nextInt(stringBase.length());
  sb.append(stringBase.charAt(l));
  }
  toadd = sb.toString();
  }while(stringList.contains(toadd));

      System.out.println("添加了元素：" + toadd);
      stringList.add(toadd);
  }
  System.out.println("-------------排序前-------------");
  for (String string : stringList) {
      System.out.println("元素：" + string);
  }
  Collections.sort(stringList);
  System.out.println("-------------排序后-------------");
  for (String string : stringList) {
      System.out.println("元素：" + string);
  }

  }