String?string?=?"0123456789qwertyuiopasdfghjklzxcvbnmQWERTYUIOPASDFGHJKLZXCVBNM";		Random?random?=?new?Random();		ArrayList?<String>?list?=?new?ArrayList<String>();		for?(int?i?=?0;i<10;){			StringBuffer?sb?=?new?StringBuffer();			int?length?=?random.nextInt(10);			do{				sb.append(string.charAt(random.nextInt(62)));			}while(sb.length()<length);			if(!list.contains(sb)){				list.add(sb.toString());				i++;			}else{				i=i;			}		}		System.out.println("-------排序之前------");		for(String?ss:list){			System.out.println(ss);		}		System.out.println("---------排序之后---------");		Collections.sort(list);		for(String?ss?:list){			System.out.println(ss);		}