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     public void addFirst(Object o)£ºÏòÁ´±íµÄÍ·Ìí¼ÓеĽáµão
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     public void clear()£ºÉ¾³ýÁ´±íµÄËùÓнáµã£¬Ê¹µ±Ç°Á´±í³ÉΪ¿ÕÁ´±í
     public Object remove(int index)£ºÉ¾³ýÖ¸¶¨Î»ÖÃindexÉϵĽáµã
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