list排序

http://blog.csdn.net/tjcyjd/article/details/6804690

http://blog.csdn.net/xiaxiaorui2003/article/details/24308785

‘改list内容

http://bbs.csdn.net/topics/390846767

’https://zhidao.baidu.com/question/91971366.html

retainAll方法求交集

https://zhidao.baidu.com/question/1770375429803673300.html

http://book.2cto.com/201309/31474.html

list和数组互转

http://jingyan.baidu.com/article/86f4a73e607f2937d7526972.html

之前关闭scanner  

http://bbs.csdn.net/topics/390788856

输入

OO先导课——bug与知识（第二次作业）