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          public boolean add(Object o)£ºÏòÊ÷¼¯ÖÐÌí¼Ó½áµão£¬Ìí¼Ó³É¹¦·µ»Øtrue£¬·ñÔò·µ»Øfalse
          public void clear()£ºÉ¾³ýÊ÷¼¯ÖеÄËùÓнáµã
          public void contains(Object o)£ºÈç¹ûÊ÷¼¯°üº¬¾ßÓÐÊý¾ÝoµÄ½áµã£¬¸Ã·½·¨·µ»Øtrue£¬·ñÔò·µ»Øfalse
          public Object first()£º·µ»ØÊ÷¼¯Öиù½ÚµãÖеĶÔÏó
          public Object last()£º·µ»Ø×îºóÒ»¸ö½áµãÖеĶÔÏó
          public boolean isEmpty()£ºÅжϵ±Ç°Ê÷¼¯ÊÇ·ñΪ¿ÕÊ÷¼¯
          public boolean remove(Object o)£ºÉ¾³ýÊ÷¼¯ÖеÚÒ»¸ö³öÏֵĽáµã¶ÔÏóo
          public int size()£º·µ»ØÊ÷¼¯ÖнáµãµÄÊýÄ¿
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