package?com.imooc.collection;import?java.util.ArrayList;import?java.util.Collections;import?java.util.List;import?java.util.Random;public?class?TestCollectionsSortString?{		/**	*?生成隨機字符串	*?@param?length	*?@return	*/	public?String?getRandomString(int?length)?{		String?str?="abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789";		Random?random=new?Random();????????StringBuffer?sb=new?StringBuffer();????????for(int?i=0;i<length;i++){????????????//產生62以內的隨機數，因為組成隨機字符串的字符有62個????????????int?number=random.nextInt(62);????????????//將str的第number個字符加到sb的末尾????????????sb.append(str.charAt(number));????????}????????return?sb.toString();	}		/**	*?讓隨機字符串的長度為10以內隨機整數，并進行排序輸出	*/	public?void?testSort()?{		List<String>?stringList?=?new?ArrayList<String>();		Random?random?=?new?Random();		int?k;		String?str;		for(int?i=0;i<10;i++)?{			k?=?random.nextInt(10);			do?{				str=getRandomString(k);			}while(stringList.contains(str));			stringList.add(str);			System.out.println("成功添加："+str);		}		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);		}	}		public?static?void?main(String[]?args)?{		TestCollectionsSortString?tcss?=?new?TestCollectionsSortString();		tcss.testSort();	}}