------------------------- Collections | ------------------------- # ÓÃÓÚ²Ù×÷ Set,List,Map µÄ¾²Ì¬¹¤¾ßÀà ------------------------- Collections-¾²Ì¬×Ö¶Î/·½·¨| ------------------------- boolean addAll(Collection super T> c, T... elements) * °Ñ±ä³¤Êý¾Ý¶¼´æÈëc void shuffle(List> list); * Ëæ»ú´òÂÒ¼¯ºÏÊý¾Ý void shuffle(List> list, Random rnd) * ͬÉÏ,Ö¸¶¨µÄ Random