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     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
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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
     public Object set(int index,Object o)£º½«µ±Ç°Á´±íindexλÖýáµãÖеĶÔÏóÌ滻Ϊ²ÎÊýoÖ¸¶¨µÄ¶ÔÏ󣬲¢·µ»Ø±»Ìæ»»µÄ¶ÔÏó
     public int size()£º·µ»ØÁ´±íµÄ³¤¶È£¬¼´½áµãµÄ¸öÊý
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import java.io.*;
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java.util.*;
import java.security.*;
import java.security.cert.*;
import sun.security.x509.*
import java.security.cert.Certificate;
import java.security.cert.CertificateFactory;
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