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     public boolean add(Object o)£ºÏòÁ´±íÌí¼ÓÒ»¸öеĽáµão(Ö»ÄÜÏòÁ´±íÖÐÌí¼Ó¶ÔÏ󣬲»ÄÜÌí¼Óij¸ö»ù±¾Êý¾ÝÀàÐ͵ÄÊý)
     public void add(int index,Object o)£ºÏòÁ´±íµÄÖ¸¶¨Î»ÖÃindex´¦Ìí¼ÓÒ»¸öеĽáµão
     public void addFirst(Object o)£ºÏòÁ´±íµÄÍ·Ìí¼ÓеĽáµão
     public void addLast(Object o)£ºÏòÁ´±íµÄĩβÌí¼ÓеĽáµão
     public void clear()£ºÉ¾³ýÁ´±íµÄËùÓнáµã£¬Ê¹µ±Ç°Á´±í³ÉΪ¿ÕÁ´±í
     public Object remove(int index)£ºÉ¾³ýÖ¸¶¨Î»ÖÃindexÉϵĽáµã
     public boolean remove(Object o)£ºÉ¾³ýÊ״γöÏÖº¬ÓÐÊý¾ÝoµÄ½áµã
     public Object removeFirst()£ºÉ¾³ýµÚÒ»¸ö½áµã£¬²¢·µ»ØÕâ¸ö½áµãÖеĶÔÏó
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     public Object get(int index)£º»ñÈ¡Á´±íÖÐÖ¸¶¨Î»ÖÃindex´¦½áµãÖеĶÔÏó
     public Object getFirst()£º»ñÈ¡Á´±íÖеÚÒ»¸ö½áµãÖеĶÔÏó
     public Object getLast()£º»ñÈ¡Á´±íÖÐ×îºóÒ»¸ö½áµãÖеĶÔÏó
     public int indexOf(Object o)£º·µ»Øº¬ÓÐÊý¾ÝoµÄ½áµãÔÚÁ´±íÖÐÊ״γöÏÖµÄλÖã¬Èç¹ûÁ´±íÖÐÎ޴˽áµã£¬Ôò·µ»Ø-1
     public int lastIndexOf(Object o)£º·µ»Øº¬ÓÐÊý¾ÝoµÄ½áµãÔÚÁ´±íÖÐ×îºó³öÏÖµÄλÖã¬Èç¹ûÁ´±íÖÐÎ޴˽áµã£¬Ôò·µ»Ø-1
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     public int size()£º·µ»ØÁ´±íµÄ³¤¶È£¬¼´½áµãµÄ¸öÊý
     public boolean contains(Object o)£ºÅжÏÁ´±í½áµãÖÐÊÇ·ñÓнáµãº¬ÓжÔÏóo
     public Object clone()£ºµÃµ½µ±Ç°Á´±íÖеÄÒ»¸ö¿Ë¡Á´±í£¬¸Ã¿Ë¡Á´±íÖнáµã


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